Editing PS1 Emulation

== Description ==
Note: there are no PS1 emulators available in early Tool/DECR and Debug/DEX firmwares (does not have dev_flash/ps1emu or ps2emu folder. dev_flash/vsh/etc/version.txt & index.dat say: ¨ps1emu:NA@NA: ps2emu:NA@NA: ps2gxemu:NA@NA: emerald:NA@NA: bdp:NA@NA:¨).

{{Boxframe1|content='''Firmware changes related with PS1 emulation'''
*Firmware [[1.02_CEX|1.02]]:
**Added '''ps1_emu.self'''

*Firmware [[1.70_CEX|1.70]]:
**Added '''ps1_netemu.self'''
**Added the ability to play original PlayStation format games downloaded from the PlayStation Store.
**Added rumble functionality for USB accessories which support it when playing PS2 games.
**Saved data from PlayStation format software now usable on both PSP and PS3 systems.
**Backwards compatibility for PS1 and PS2 games was improved.

*Firmware [[1.80_CEX|1.80]]:
**Ability to upscale PS1 and PS2 games
**Ability to copy PS1/PS2 game saves from PS3 to Memory Cards using a Memory Card adapter.
**Backwards compatibility for PS1 and PS2 games was improved.

*Firmware [[2.10_CEX|2.10]]:
**Added '''ps1_newemu.self'''
**Added '''ps1_rom.bin''' (MD5: FBB5F59EC332451DEBCCF1E377017237)
**Users can now play PS1 game discs on a PSP with remote play, PSP firmware version 3.50 or newer is required. (this feature was not announced).
**Backwards compatibility for PS1 and PS2 games was improved (Update was also unannounced but evident in Sony's backwards compatibility search site).

*Firmware [[4.00_CEX|4.00]]
**Updated '''ps1_rom.bin''' (MD5: 81BBE60BA7A3D1CEA1D48C14CBCC647B). The new rom is stripped from PS2 related functions. As a result is 3565296 bytes smaller than previous version.
}}

== PS1 Emulator Types and Revisions ==
<div>
<div style="float:top; text-align:center;">'''PS1 Emulator Types and Revisions'''</div>
<div style="float:left;">
{| class="wikitable" style="line-height:100%; font-size:70%; margin-right:5px"
|+ ps1_emu.elf (decrypted)<br><div style="height:5px"></div>
! Firmware !! Size !! MD5 !! Timestamp !! <abbr title="Revision">Rev</abbr> !! style="padding:1px" | <abbr title="Maximun number of supported commands">Comm</abbr>
|-
! [[1.00_AV|1.00 AV]]
| 10 296 408 || style="font-family:monospace" | 981A7428C2A59219FA05861EDEEDBD4A || 06/10/04/12:16 || ? || ?
|-
! [[1.02_CEX|1.02]]
| 10.296.408 || style="font-family:monospace" | C5FE03742A951194C336EE33783F5CD6 || 06/10/21/00:01 || ? || ?
|-
! [[1.10_CEX|1.10]]
| 10.296.408 || style="font-family:monospace" | C9C9D7D2E36F3E3579A5DF713E9ABE1E || 06/11/09/06:09 || ? || ?
|-
! [[1.11_CEX|1.11]]
| 10.296.408 || style="font-family:monospace" | 26271CCA29B77483DC3D7FDDE7B9CC3C || 06/11/21/17:55 || ? || ?
|-
! [[1.30_CEX|1.30]]
| 10.296.496 || style="font-family:monospace" | E7932EC24E72B3005EE152B141A63690 || 06/12/05/05:34 || ? || ?
|-
! [[1.31_CEX|1.31]]
| 10.296.496 || style="font-family:monospace" | 2244DE70C85093D7E37BC3D3F4278BE1 || 06/12/12/18:48 || ? || ?
|-
! [[1.32_CEX|1.32]]
| 10.296.496 || style="font-family:monospace" | 601BCADBBBC0A2D0433C932A2D67C4EF || 06/12/18/05:55 || ? || ?
|-
! [[1.50_CEX|1.50]]
| 10.303.536 || style="font-family:monospace" | F8050B006CDFCC64DF742D7BBDC03130 || 07/01/18/22:53 || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[1.70_CEX|1.70]]
| 6.857.648 || style="font-family:monospace" | EA49942B6789FBE0A1C98BC12E282533 || 07/04/16/16:12 || ? || <abbr title="Highest Command ID used in the configs">0x14?</abbr>
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[1.90_CEX|1.90]]
| 6.974.864 || style="font-family:monospace" | 478CFED0F7EE13C94F01C2A246C83D45 || 07/07/21/06:45 || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
| colspan="6" style="background:#ff8080; text-align:center; line-height:75%" | Stripped/extracted rom/bios 
|-
! [[2.10_CEX|2.10]]
| 2.887.152 || style="font-family:monospace" | AEE181B061E586F99E76C033C9DCF726 || 07/12/15/05:30 || ? || 0x15
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[3.40_CEX|3.40]]
| 2.824.576 || style="font-family:monospace" | A6ABFB04739575E2264A4D3FEB2A9CBF || 10/06/23/15:45 || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[3.66_CEX|3.66]]
| 2.824.832 || style="font-family:monospace" | 95399A202003E216794511BD2D2E9DF6 || 11/06/16/03:52 || ? || ?
|-{{cellcolors|#bbbbff}}
! [[3.70_CEX|3.70]]
| rowspan="3" | 2.824.920 || style="font-family:monospace" | 045D81147B9BDFB8C8A416FD5F5A0C56 || 11/08/05/03:42 || rowspan="3" | same || rowspan="3" | ?
|-{{cellcolors|#bbbbff}}
! ~
| colspan="2" style="text-align:center; background-color:#bbbbff;" | ''Any''
|-{{cellcolors|#bbbbff}}
! [[3.72_CEX|3.72]]
| style="font-family:monospace" | C745A30231103B83F04539021E4878FC || 11/09/14/01:17
|-{{cellcolors|#ddddff}}
! [[3.73_CEX|3.73]]
| rowspan="2" | 2.824.920 || style="font-family:monospace" | EB3AFF30B3206CFA6A8962AB393F773E || 11/10/04/12:55 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#ddddff}}
! [[3.74_CEX|3.74]]
| style="font-family:monospace" | E2A77C3DC9FD5AD4264341196462D096 || 11/10/25/00:38
|-{{cellcolors|#bbbbff}}
! [[4.00_CEX|4.00]]
| rowspan="3" | 2.829.784 || style="font-family:monospace" | 94A8E6A8063C08FAD8CA9B340CCCAE67 || 11/11/22/03:17 || rowspan="3" | same || rowspan="3" | ?
|-{{cellcolors|#bbbbff}}
! ~
| colspan="2" style="text-align:center; background-color:#bbbbff;" | ''Any''
|-{{cellcolors|#bbbbff}}
! [[4.11_CEX|4.11]]
| style="font-family:monospace" | 02B7F6D5F517959161B2154135D4B3BC || 12/02/11/07:13
|-
! [[4.15_CEX|4.15]]
| ? || ? || ? || ? || ?
|-{{cellcolors|#ddddff}}
! [[4.20_CEX|4.20]]
| rowspan="2" | 2.829.912 || style="font-family:monospace" | 3778948C92F5FA12CB0AABE65BEE5465 || 12/06/15/02:09 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#ddddff}}
! [[4.21_CEX|4.21]]
| style="font-family:monospace" | B7B662397E3FFDD7C11F9617C1B41856 || 12/06/30/01:13
|-
! [[4.23_SEX|4.23 S]]
| 2.829.912 || style="font-family:monospace" | 6E74CC51E0C6462DF1F9278ED9DB9593 || 12/07/31/00:22 || ? || ?
|-
! [[4.25_CEX|4.25]]
| 2.829.912 || style="font-family:monospace" | 03EA65C3EA3F8DB04F236C49C6B6C0E1 || 12/09/07/07:03 || <abbr title="same code than 4.20 CEX and 4.21 CEX.... but different than the 4.23 SEX in between, grrrr">same</abbr> || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[4.78_CEX|4.78]]
| 2.765.488 || style="font-family:monospace" | 354F1DEEDCA3C4CFA1B49B6B28B1648D || 15/12/17/01:18 || ? || ?
|-
! [[4.80_CEX|4.80]]
| ? || ? || ? || ? || ?
|-
! [[4.81_CEX|4.81]]
| 2.765.616 || style="font-family:monospace" | 2123E3D6A8E81647CB41F51AFEE6CCD6 || 16/10/24/19:23 || ? || ?
|-
! colspan="6" style="background:#80ff80; line-height:75%" | Abandoned (last revision)
|-{{cellcolors|#ddddff}}
! [[4.82_CEX|4.82]]
| rowspan="3" | 2.765.616 || style="font-family:monospace" | 64BFA4DBD595A20E317B2189B54BF673 || 17/08/24/15:42 || rowspan="3" | Last || rowspan="3" | 0x15
|-
! ~
| colspan="2" style="text-align:center; background-color:#ddddff;" | ''Any''
|-
! [[4.89_CEX|4.89]]
| style="background-color:#ddddff; font-family:monospace" | 44F975821FD714E2E810771836178CB3 || style="background-color:#ddddff;" | 22/02/04/14:38
|}
<span style="font-size:small">
{{dot}}'''Decrypted (elf)''': changes <abbr title="When comparing two decrypted files of the same revision from different firmwares the only differences are the build label (1 area with size 0x20) and the target firmware (1 area with size 0x2)">every firmware version</abbr><br>
{{dot}}'''<abbr title="0x20 bytes">Build label</abbr>''': yes, with timestamp, search for '''-sgpu-sspu-sli4'''<br>
{{dot}}'''<abbr title="2 bytes">Target Firmware</abbr>''': yes repeated '''one''' time<br>
{{dot}}'''Revision''': unknown
</span>
</div>
<div style="float:left;">
{| class="wikitable" style="line-height:100%; font-size:70%; margin-left:5px; margin-right:5px"
|+ ps1_netemu.elf (decrypted)<br><div style="height:5px"></div>
! Firmware !! Size !! MD5 !! Timestamp !! <abbr title="Revision">Rev</abbr> !! style="padding:1px" | <abbr title="Maximun number of supported commands">Comm</abbr>
|-
! [[1.70_CEX|1.70]]
| 6.872.592 || style="font-family:monospace" | 5DA8492C4702F94DDDC4530921316789 || 07/04/16/16:13 || ? || <abbr title="Highest Command ID used in the configs">0x16?</abbr>
|-
! ?
| ? || ? || ? || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[1.90_CEX|1.90]]
| 6.853.368 || style="font-family:monospace" | 8A5A3676B461C97A9A467D5651D6EAAD || 07/07/21/06:47 || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
| colspan="6" style="background:#ff8080; text-align:center; line-height:75%" | Stripped/extracted rom/bios 
|-
! [[2.10_CEX|2.10]]
| 2.764.288 || style="font-family:monospace" | 7826B1C6799404216D4771C07DE12F53 || 07/12/15/05:31 || ? || <abbr title="Highest Command ID used in the configs">0x18?</abbr>
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[3.40_CEX|3.40]]
| 2.971.288 || style="font-family:monospace" | FD32C7B7CBA2639FC8DB9EB615A16461 || 10/06/23/15:46 || 6520 || <abbr title="Highest Command ID used in the configs">0x2C?</abbr>
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[3.66_CEX|3.66]]
| 2.971.976 || style="font-family:monospace" | 9586FC8B121E59526C31405DCFFB79CA || 11/06/16/03:54 || ? || ?
|-{{cellcolors|#bbbbff}}
! [[3.70_CEX|3.70]]
| rowspan="3" | 2.972.168 || style="font-family:monospace" | AA1DB63461EE0BE021ED45F85A6EECE0 || 11/08/05/03:43 || rowspan="3" | same || rowspan="3" | ?
|-{{cellcolors|#bbbbff}}
! ~
| colspan="2" style="text-align:center; background-color:#bbbbff;" | ''Any''
|-{{cellcolors|#bbbbff}}
! [[3.72_CEX|3.72]]
| style="font-family:monospace" | 32F45129EC2844D419582912E54CEB22 || 11/09/14/01:18
|-{{cellcolors|#ddddff}}
! [[3.73_CEX|3.73]]
| rowspan="2" | 2.972.168 || style="font-family:monospace" | 17063FFAB205B72ABF7F59582B8A7988 || 11/10/04/12:56 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#ddddff}}
! [[3.74_CEX|3.74]]
| style="font-family:monospace" | 89C03D80ACE7C4FA914DD699621EB4F8 || 11/10/25/00:40
|-{{cellcolors|#bbbbff}}
! [[4.00_CEX|4.00]]
| rowspan="2" | 2.977.128 || style="font-family:monospace" | DBB8FB62BE3F2064D31332FCB7575DF1 || 11/11/22/03:19 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#bbbbff}}
! [[4.01_CEX|4.01]]
| style="font-family:monospace" | 9E60379FA979B0440C27C6AEE38754AF || 11/12/23/01:10
|-{{cellcolors|#ddddff}}
! [[4.10_CEX|4.10]]
| rowspan="2" | 2.977.208 || style="font-family:monospace" | B3CD41AB8235906AB41D3DA18D04F00E || 12/02/05/23:19 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#ddddff}}
! [[4.11_CEX|4.11]]
| style="font-family:monospace" | 4DDF2C3289AD9BEDF0719DBE1BDA971C || 12/02/11/07:15
|-
! [[4.15_CEX|4.15]]
| ? || ? || ? || ? || ?
|-{{cellcolors|#bbbbff}}
! [[4.20_CEX|4.20]]
| rowspan="2" | 2.977.432 || style="font-family:monospace" | 363A2D5EE2246E9CEFCBF1078593C771 || 12/06/15/02:10 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#bbbbff}}
! [[4.21_CEX|4.21]]
| style="font-family:monospace" | 5E08C86EC07E4F227D3591DD9530CC95 || 12/06/30/01:15
|-
! [[4.23_SEX|4.23 S]]
| 2.977.416 || style="font-family:monospace" | 149E5E6AD727B1B37E29D4E8D15D5BB0 || 12/07/31/00:23 || ? || ?
|-
! [[4.25_CEX|4.25]]
| 2.977.432 || style="font-family:monospace" | 295B61D9EEE704077FEC870C8EAC7D35 || 12/09/07/07:04 || <abbr title="same code than 4.20 CEX and 4.21 CEX.... but different than the 4.23 SEX in between, grrrr">same</abbr> || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[4.78_CEX|4.78]]
| 2.913.480 || style="font-family:monospace" | 398A7CA9F0E8449E15FCB33B87C96194 || 15/12/17/01:19 || ? || ?
|-
! [[4.80_CEX|4.80]]
| ? || ? || ? || ? || ?
|-
! [[4.81_CEX|4.81]]
| 2.913.656 || style="font-family:monospace" | 8765A00EE467B8635A13ECCBB1F85B89 || 16/10/24/19:24 || ? || ?
|-
! [[4.82_CEX|4.82]]
| 2.913.752 || style="font-family:monospace" | FCEB6595F9F8E5C77BA36C73C38397D9 || 17/08/24/15:43 || ? || ?
|-
! colspan="6" style="background:#80ff80; line-height:75%" | Abandoned (last revision)
|-{{cellcolors|#ddddff}}
! [[4.83_CEX|4.83]]
| rowspan="3" | 2.913.992 || style="font-family:monospace" | CA9509623B9885E18D12E14FA1488EEF || 18/09/02/18:03 || rowspan="3" | 11624 || rowspan="3" | 0x3C
|-
! ~
| colspan="2" style="text-align:center; background-color:#ddddff;" | ''Any''
|-
! [[4.89_CEX|4.89]]
| style="background-color:#ddddff; font-family:monospace" | AE51D20A9E9564A135800E0F0AFC3F53 || style="background-color:#ddddff;" | 22/02/04/14:39
|}
<span style="font-size:small">
{{dot}}'''Decrypted (elf)''': changes <abbr title="When comparing two decrypted files of the same revision from different firmwares the only differences are the build label (1 area with size 0x20) and the target firmware (2 areas with size 0x2)">every firmware version</abbr><br>
{{dot}}'''<abbr title="0x20 bytes">Build label</abbr>''': yes, with timestamp, search for '''-sgpu-sli4'''<br>
{{dot}}'''<abbr title="2 bytes">Target Firmware</abbr>''': yes repeated '''two''' times<br>
{{dot}}'''Revision''': <abbr title="ps1_netemu.self from firmware 2.10 (or older) doesnt contains the revision string">sometimes</abbr>, search for '''Revision'''
</span>
</div><div style="float:left;">
{| class="wikitable" style="line-height:100%; font-size:70%; margin-left:5px; margin-right:5px"
|+ ps1_newemu.elf (decrypted)<br><div style="height:5px"></div>
! Firmware !! Size !! MD5 !! Timestamp !! <abbr title="Revision">Rev</abbr> !! style="padding:1px" | <abbr title="Maximun number of supported commands">Comm</abbr>
|-
! [[2.10_CEX|2.10]]
| 2.763.848 || style="font-family:monospace" | C792C72A06B94705374B846B94981B1A || 07/12/15/05:31 || ? || <abbr title="Highest Command ID used in the configs">0x19?</abbr>
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[3.40_CEX|3.40]]
| 2.708.856 || style="font-family:monospace" | C866D54E85BAA06D111C8300F9EA85F1 || 10/06/23/15:51 || ? || <abbr title="Highest Command ID used in the configs">0x18?</abbr>
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[3.66_CEX|3.66]]
| 2.708.864 || style="font-family:monospace" | 9AB86CFAEB12675F3DB08FCAA3541534 || 11/06/16/03:54 || ? || ?
|-{{cellcolors|#bbbbff}}
! [[3.70_CEX|3.70]]
| rowspan="3" | 2.708.880 || style="font-family:monospace" | 7AB7C32901778E3F0C9B8DB45296821B || 11/08/05/03:44 || rowspan="3" | same || rowspan="3" | ?
|-{{cellcolors|#bbbbff}}
! ~
| colspan="2" style="text-align:center; background-color:#bbbbff;" | ''Any''
|-{{cellcolors|#bbbbff}}
! [[3.72_CEX|3.72]]
| style="font-family:monospace" | 2863E9B70B4FB6C5A0938FF508C46057 || 11/09/14/01:18
|-{{cellcolors|#ddddff}}
! [[3.73_CEX|3.73]]
| rowspan="2" | 2.708.880 || style="font-family:monospace" | 871E256771632569D664FF2A1ECE82C3 || 11/10/04/12:57 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#ddddff}}
! [[3.74_CEX|3.74]]
| style="font-family:monospace" | 8A8AC80CBA58561CC754C6CF66B059AB || 11/10/25/00:40
|-{{cellcolors|#bbbbff}}
! [[4.00_CEX|4.00]]
| rowspan="2" | 2.713.832 || style="font-family:monospace" | F9E840430B2BC982CB1A71B7BDD7FC35 || 11/11/22/03:19 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#bbbbff}}
! [[4.01_CEX|4.01]]
| style="font-family:monospace" | 953090CBCB96626899731B711B3D5B6A || 11/12/23/01:11
|-{{cellcolors|#ddddff}}
! [[4.10_CEX|4.10]]
| rowspan="2" | 2.713.720 || style="font-family:monospace" | 47E7FA52DB7BDEDF2187EB02D868834D || 12/02/05/23:20 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#ddddff}}
! [[4.11_CEX|4.11]]
| style="font-family:monospace" | 8A90DB2A206BE79423A99D4CF2458241 || 12/02/11/07:16
|-
! [[4.15_CEX|4.15]]
| ? || ? || ? || ? || ?
|-{{cellcolors|#bbbbff}}
! [[4.20_CEX|4.20]]
| rowspan="2" | 2.713.904 || style="font-family:monospace" | 8AC80356D1EFDDCFF7A7AD82136137D2 || 12/06/15/02:11 || rowspan="2" | same || rowspan="2" | ?
|-{{cellcolors|#bbbbff}}
! [[4.21_CEX|4.21]]
| style="font-family:monospace" | E482927E47B00C1478313E343DD652C4 || 12/06/30/01:15
|-
! [[4.23_SEX|4.23 S]]
| 2.713.888 || style="font-family:monospace" | A2CF9C4C00B40779FB5C529849E0D6A4 || 12/07/31/00:24 || ? || ?
|-
! [[4.25_CEX|4.25]]
| 2.713.904 || style="font-family:monospace" | 24107753F0B02075DAB20492BA67167D || 12/09/07/07:05 || <abbr title="same code than 4.20 CEX and 4.21 CEX.... but different than the 4.23 SEX in between, grrrr">same</abbr> || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! ?
| ? || ? || ? || ? || ?
|-
! [[4.78_CEX|4.78]]
| 2.649.144 || style="font-family:monospace" | BF78A0DC74084B43777A7F8CE6C7B66A || 15/12/17/01:20 || ? || ?
|-
! [[4.80_CEX|4.80]]
| ? || ? || ? || ? || ?
|-
! [[4.81_CEX|4.81]]
| 2.649.272 || style="font-family:monospace" | 0C76DE974439B12546EA494639C8EE9A || 16/10/24/19:25 || ? || ?
|-
! colspan="6" style="background:#80ff80; line-height:75%" | Abandoned (last revision)
|-{{cellcolors|#ddddff}}
! [[4.82_CEX|4.82]]
| rowspan="3" | 2.649.288 || style="font-family:monospace" | C5957F268EE9E1429DE3AF0BC15F1395 || 17/08/24/15:44 || rowspan="3" | Last || rowspan="3" | 0x18
|-
! ~
| colspan="2" style="text-align:center; background-color:#ddddff;" | ''Any''
|-
! [[4.89_CEX|4.89]]
| style="background-color:#ddddff; font-family:monospace" | F3739EB5CB787316B614F0CF244726D2 || style="background-color:#ddddff;" | 22/02/04/14:39
|}
<span style="font-size:small">
{{dot}}'''Decrypted (elf)''': changes <abbr title="When comparing two decrypted files of the same revision from different firmwares the only differences are the build label (1 area with size 0x20) and the target firmware (2 areas with size 0x2)">every firmware version</abbr><br>
{{dot}}'''<abbr title="0x20 bytes">Build label</abbr>''': yes, with timestamp, search for '''-sgpu-sspu-sli4'''<br>
{{dot}}'''<abbr title="2 bytes">Target Firmware</abbr>''': yes repeated '''two''' times<br>
{{dot}}'''Revision''': unknown
</span>
</div>
</div>
<br style="clear: both;" />

== PS1 emulators workload comparison ==

All emulators seems to use similar workload. Note that SPU 0-4 don't use JOB name per se, so is just info what they do.

{| class="wikitable" style="font-size:100%; line-height:100%"
|+ ps1_emu.self<br><div style="height:5px"></div>
! Core !! Job !! Source !! Notes
|-
| SPU0 || PS1 GPU SLI0 || SPU ASM || PS1 GPU software emulation
|-
| SPU1 || PS1 GPU SLI1 || SPU ASM || PS1 GPU software emulation
|-
| SPU2 || PS1 GPU SLI2 || SPU ASM || PS1 GPU software emulation
|-
| SPU3 || PS1 GPU SLI3 || SPU ASM || PS1 GPU software emulation
|-
| SPU4 || PS1 SPU || SPU ASM || PS1 SPU software emulation
|-
| SPU5 || _libadec_at3CellSpursKernel0  || SPU ASM || AT library from ps3 firmware
|-
| SPU6 || Isolation || C++ Raw SPU || Not PS1 emu specific
|-{{cellcolors|lightgrey}}
| SPU7 || - || - || Unavailable: Factory disabled SPU
|-
| PPU:0 || ? || ? ||
|-
| PPU:1 || ? || ? ||
|}
{| class="wikitable" style="font-size:100%; line-height:100%"
|+ ps1_netemu.self<br><div style="height:5px"></div>
! Core !! Job !! Source !! Notes
|-
| SPU0 || PS1 GPU SLI0 || SPU ASM || PS1 GPU software emulation
|-
| SPU1 || PS1 GPU SLI1 || SPU ASM || PS1 GPU software emulation
|-
| SPU2 || PS1 GPU SLI2 || SPU ASM || PS1 GPU software emulation
|-
| SPU3 || PS1 GPU SLI3 || SPU ASM || PS1 GPU software emulation
|-
| SPU4 || PS1 SPU || SPU ASM || PS1 SPU software emulation
|-
| SPU5 || _libadec_at3CellSpursKernel0  || SPU ASM || AT3 library from ps3 firmware
|-
| SPU6 || Isolation || C++ Raw SPU || Not PS1 emu specific
|-{{cellcolors|lightgrey}}
| SPU7 || - || - || Unavailable: Factory disabled SPU
|-
| PPU:0 || ? || ? ||
|-
| PPU:1 || ? || ? ||
|}
{| class="wikitable" style="font-size:100%; line-height:100%"
|+ ps1_newemu.self<br><div style="height:5px"></div>
! Core !! Job !! Source !! Notes
|-
| SPU0 || PS1 GPU SLI0 || SPU ASM || PS1 GPU software emulation
|-
| SPU1 || PS1 GPU SLI1 || SPU ASM || PS1 GPU software emulation
|-
| SPU2 || PS1 GPU SLI2 || SPU ASM || PS1 GPU software emulation
|-
| SPU3 || PS1 GPU SLI3 || SPU ASM || PS1 GPU software emulation
|-
| SPU4 || PS1 SPU || SPU ASM || PS1 SPU software emulation
|-
| SPU5 || _libadec_at3CellSpursKernel0  || SPU ASM || AT3 library from ps3 firmware
|-
| SPU6 || Isolation || C++ Raw SPU || Not PS1 emu specific
|-{{cellcolors|lightgrey}}
| SPU7 || - || - || Unavailable: Factory disabled SPU
|-
| PPU:0 || ? || ? ||
|-
| PPU:1 || ? || ? ||
|}

== PS1 BIOS ==
The PS1 emulators included in between PS3 firmwares [[1.00_AV|1.00]] up to [[2.01_CEX|2.01]] contains a PS1 BIOS embedded inside the emulator .SELF structure<br>
In PS3 firmware [[2.10_CEX|2.10]] (at the same time the ps1_newemu.self was introduced) the PS1 BIOS was extracted from the .SELF and shipped as an independant file named ps1_rom.bin. This BIOS have a size of 4.089.584 bytes (MD5: FBB5F59EC332451DEBCCF1E377017237) and is exactly the same file that was previously embedded in all PS1 emulators<br>
In PS3 firmware [[4.00_CEX|4.00]] the ps1_rom.bin file was reduced in size down to 524.288 bytes (MD5: 81BBE60BA7A3D1CEA1D48C14CBCC647B) by removing the unrelated PS2 functions<br>
The latest version of ps1_rom file is the first 512KB of the 1.90 PS2 rom.<br>

{| class="wikitable" style="line-height:110%; font-size:90%"
|+ ps1_rom.bin<br><div style="height:5px"></div>
! Firmware !! Size !! MD5
|-
! [[2.10_CEX|2.10]] ~ [[3.74_CEX|3.74]]
| 4.089.584 || style="font-family:monospace" | FBB5F59EC332451DEBCCF1E377017237
|-
! [[4.00_CEX|4.00]] ~ [[4.88_CEX|4.88]]
| 524.288 || style="font-family:monospace" | 81BBE60BA7A3D1CEA1D48C14CBCC647B
|}

The PS1 BIOS version can be seen in a string (codenamed VERSTR) with this text, where the last character of the first text row with the suffix "'''A'''" indicates the region (A=America, E=Europe, J=Japan). This character is always located at offset 0x7FF52 in all PS1 and PS2 bios/roms
<pre>System ROM Version 5.0 06/23/03 A
Copyright 1993-1999 (C) Sony Computer Entertainment Inc.
</pre>
On PCSX2 while in PS1 mode the latest versions of the "'''J'''" and "'''E'''" roms/bios are not able to load the games from all regions because was added an additional '''CD licence check''' that only accepts the discs matching the hardcoded region<br>
The  "'''A'''" roms/bios are able to load all regions games because doesnt have this check. It happens the same in the PS2 roms/bios, only the "'''A'''" ones accepts the games from all regions by default (this is why you have to patch the MECHACON for the US DTL region to get true region free playback)<br>
The bios included in the PS3 firmwares is the "'''A'''" version, so it doesnt have this check, and allows the version string to be patched to replace the suffix "'''A'''" by "'''E'''" or "'''J'''" as explained below

=== PS1 BIOS Region patch ===
Inside the emulators there is a string with the characters: <span style="font-familly:monospace; font-weight:bold">JJJJAEJEAEJJEJJA</span> that works as a selector based on the [[Product Code]] (also known as TargetID, and located inside the [[IDPS]])<br>
When the emulators are executed (inmediatly before booting the game) the PS3 does a check to the [[Product Code]], then the PS1 BIOS is loaded into memory and a patch is applyed to the version string to replace the suffix "'''A'''" by one of the characters from the selector string<br>
This patch is related to the region, there are only 3 posible results for it, '''A'''=America, '''E'''=Europe, '''J'''=Japan. It changes the video output, and is unknown if is responsible for anything else, like timings etc...

<div style="overflow-x:auto">
{|class="wikitable" style="line-height:110%; font-size:90%"
|-style="text-align:center"
! Console Type
| {{NOT_IN_USE}} || class="nowrap" | {{TOOL}} {{SD}} || class="nowrap" | {{DEX}} {{DTCP-IP}} {{TEST}} || colspan="13" | {{CEX}} {{SHOP}}
|-style="text-align:center; font-weight:bold"
! [[SKU_Regioning|Release Region]]
| colspan="3" | WorldWide || Japan || US<br>Canada || Europe || Korea || U.K.<br>Ireland || Mexico || Australia<br>New Zealand || Singapore<br>Malaysia || Taiwan || Russia<br>Ukraine<br>India || China || Hong Kong || Brazil
|-style="text-align:center"
! [[SKU_Models|PS3 Models]]
| style="background:lightgrey" | N/A || DECR-xx'''00'''<br>DEH-Zxx'''00''' || DECH-xx'''00'''&nbsp;&nbsp;<br>DECH-Sxx'''00''' || CECHx'''00'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''00''' || CECHx'''01'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''01''' || CECHx'''04'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''04''' || CECHx'''05'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''05''' || CECHx'''03'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''03''' || CECHx'''11'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''11''' || CECHx'''02'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''02''' || CECHx'''06'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''06''' || CECHx'''07'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''07''' || CECHx'''08'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''08''' || style="background:lightgrey" | N/A || CECHx'''12'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''12''' || CECHx'''14'''&nbsp;&nbsp;&nbsp;<br>CECH-xx'''14'''
|-style="text-align:center; font-weight:bold"
! [[Product Code]]
| 0x80 || 0x81 || 0x82 || 0x83 || 0x84 || 0x85 || 0x86 || 0x87 || 0x88 || 0x89 || 0x8A || 0x8B || 0x8C || 0x8D || 0x8E || 0x8F
|-style="text-align:center"
! [[SKU_Regioning|PS1 PS2 Region]]
| colspan="3" | NTSC-J || NTSC-J || NTSC-U/C || PAL || NTSC-J || PAL || NTSC-U/C || PAL || NTSC-J || NTSC-J || PAL || NTSC-J || NTSC-J || NTSC-U/C
|-style="text-align:center; font-weight:bold"
! PS1 BIOS patch
! J !! J !! J !! J !! A !! E !! J !! E !! A !! E !! J !! J !! E !! J !! J !! A
|}
</div>
As example, in a retail PS3 model released in Europe (Fat=CECHx'''04''' or Slim/SuperSlim CECH-xx'''04''') the version string inside ps1_rom.bin is patched with the suffix "'''E'''" resulting in:
<pre>
System ROM Version 5.0 06/23/03 E
Copyright 1993-1999 (C) Sony Computer Entertainment Inc.
</pre>

==== PS1 BIOS Cobra Patch ====
Every CFW which use cobra module potentially can be affected by nasty bug that is there probably even before 7.00, example based on ps1_emu:
<pre>
SprxPatch ps1_emu_patches[] =
{
	{ ps1_emu_get_region_offset, LI(R29, 0x82), &condition_true }, /* regions 0x80-0x82 bypass region check. */
	{ 0 }
};
</pre>

The cobra patch is skipping part of code where the region of the PS3 is stored for later usage, and is setting the whole emulation to Japan region (NTSC U/C) by applying an static hard patch that belongs to [[Product Code]] '''0x82''' (a debug DECH-xx'''00''' PS3 model) potentially leading to PAL games frame pacing issues, desynced audio, and maybe more. While i can't test that i'm 100% sure that better solution here will be read third character of Title ID from SYSTEM.CNF file of disc/iso, and then applying a dynamic patch based on it<br>
If the game Title ID have an "'''E'''" (example: SLES-12345) then patch to ANY EU target ID, similar for US, for titles where U or E isn't found just use default J target ID
<pre>
SprxPatch ps1_emu_patches[] =
{
	{ ps1_emu_get_region_offset, LI(R29, title_id_based_region), &condition_true }, /* Dynamic patch based on TitleID. */
	{ 0 }
};
</pre>

=== PS1 BIOS Replacements ===
Is worth to note the suffix "'''A'''", "'''E'''", or "'''J'''" in the version string inside the BIOS is always on the same offset in ALL PS1 and PS2 bios images. So in case of replacing the bios the patches mentioned above will be applyed normally<br>
The bios can be replaced by any PS1 rom image (included DTL models), and by most PS2 rom images (maybe by all, deckard models untested). Replacing it by the original PS1 bios restores the Sony logo at start up, and is able to run PS1 menu alone (unmounting disc image with WebMAN during Sony Computer Entertainment logo). Both memory card and CD player are fully accessible. Remounting a disc image (regardless if different than the one started with) will work and boot to PlayStation logo from main menu. Props to Jabu, iirc he figured out running Sony startup screen ages ago<br>
The emulator have a bug (netemu at least) that loads the bios with a fixed size of 4MB file. They probably not changed that size after they reduced the bios file size from 4MB to 512KB. So any PS1/PS2(no deckard) bios image can be used if it have a size of 4MB or smaller. All of them should load games fine.

==PS1 GPU emulation==

That part of all 3 emulators is quite impressive. Task is split between 4 SPE cores, but not in usual way.
Every core is responsible for different part of PS1 GPU command flow, which is done dynamically. All that is linked by so called sli (spu link?), and all SPE cores run exactly same elf file.
SPE program synchronize using sliTick, and sliTock functions with use of channels 16 - 24, and with help of PPU.
That way 4 different PS1 GPU emulators can proceed 4 different PS1 GPU commands at the same time, with synchronization enough to not override other PS1 GPU tasks.
As a example you can remove dithering by patch only on SPU0, and observe that only 1/4 of displayed lines will be missing dither pattern. 

== PSone Classic format ==
See: [[ISO.BIN.EDAT]] and [[PSISOIMG0000]]

* Savegames Location: /dev_hdd0/savedata/vmc
Note: capitalisation of filename is important: name it xxx.VM1 instead of xxxx.vm1 (e.g. Internal Memory Card.VM1 for PSX/PSone, Internal Memory Card.VM2 for PS2/PStwo)

The .VMx files appear to be raw memory card data:
* [[PS1_Savedata#Virtual_Memory_Card_PS1_.28.VM1.29 | .VM1 Playstation 1 Memory cards]] can be edited with [[PS1_Savedata#Memory_Card_Tools_PS1 | MemcardRex]]
* [[PS2_Savedata#Virtual_Memory_Card_PS2_.28.VM2.29 | .VM2 Playstation 2 Memory cards]] can be edited with [http://www.csclub.uwaterloo.ca:11068/mymc/ mymc]

== Arguments ==

=== ps1_emu.self ===

{| class="wikitable"
|+ps1_emu.self arguments
! 7 arguments !! Name !! Example !! Notes
|-
| argv[0] || self starting location || dev_flash/ps1emu/ps1_emu.self ||
|-
| argv[1] || VM1-1 location || dev_hdd0/savedata/vmc/filename1.VM1 ||
|-
| argv[2] || VM1-2 location || dev_hdd0/savedata/vmc/filename2.VM1 ||
|-
| argv[3] || Regionnumber/TargetID || 0082 ||
|-
| argv[4] || unknown || 1200 || <!-- Screen Resolution... related ? -->
|-
| argv[5] || unknown || 1 || '''[[XRegistry.sys]]/setting/game/emuUpConvert''' ? (full/normal/off = 2/1/0)
|-
| argv[6] || unknown || 0 || '''[[XRegistry.sys]]/setting/game/emuSmoothing''' ? (on/off = 1/0)
|-
|}

=== ps1_netemu.self ===

{| class="wikitable"
|+ps1_netemu.self arguments
! 9 arguments !! Name !! Example !! Notes
|-
| argv[0] || Self starting location || dev_flash/ps1emu/ps1_netemu.self ||
|-
| argv[1] || VM1-1 name || (dev_hdd0/savedata/vmc/)argv[1] ||
|-
| argv[2] || VM1-2 name || (dev_hdd0/savedata/vmc/)argv[2] ||
|-
| argv[3] || Regionnumber/TargetID || 0084 ||
|-
| argv[4] || Unknown || 1200 || <!-- Screen Resolution... related ? -->
|-
| argv[5] || Path to ps1 game || /dev_hdd0/game/NPUJ01324 ||
|-
| argv[6] || Vibration on/off? || 1 || Seems to be '''[[XRegistry.sys]]/setting/pad/vibrationEnable'''	
|-
| argv[7] || Emu UpConvert || 0 || '''[[XRegistry.sys]]/setting/game/emuUpConvert''' ? (full/normal/off = 2/1/0)
|-
| argv[8] || Emu Smoothing || 0 || '''[[XRegistry.sys]]/setting/game/emuSmoothing''' ? (on/off = 1/0)
|-
|}

=== ps1_newemu.self ===

{| class="wikitable"
|+ps1_newemu.self arguments
! 9 arguments !! Name !! Example !! Notes
|-
| argv[0] || self starting location || dev_flash/ps1emu/ps1_newemu.self ||
|-
| argv[1] || VM1-1 name || (dev_hdd0/savedata/vmc/)argv[1] ||
|-
| argv[2] || VM1-2 name || (dev_hdd0/savedata/vmc/)argv[2] ||
|-
| argv[3] || Regionnumber/TargetID || 0082 ||
|-
| argv[4] || unknown || 600 ||
|-
| argv[5] || path to ps1 game || /dev_hdd0/game/NPUJ01324 ||
|-
| argv[6] || unknown || 1 ||
|-
| argv[7] || unknown || 2 ||
|-
| argv[8] || unknown || 2 ||
|-
|}

== PS1 games management in multiman ==
=== Manual starting SELF method ===
#Insert PSX/PSone disc (region/pressed doesn't matter)
#Start MultiMAN (e.g. 2.07.01++)
::*Since 02.07.05 the PSX and PS2 discs are properly detected. PSX discs will show in XMB Game Column and you can launch the PS1 game from there. It uses ps1_emu.self default (you can choose Load or Load (Net), latter uses ps1_netemu).
#Switch to filemanager mode
#Browse to /dev_flash/ps1emu
#Select either one of the ps1 emulation SELF files

Note: Some games run better with ps1_emu.self (e.g. Mortal Kombat) while others run better with ps1_netemu.self (e.g. Resident Evil 3). If it doesn't work, try another ps1 emulation SELF file.

Downside: memory card options are unavailable unless you created a Virtual Memorycard ''before'' starting MultiMAN (XMB::Category Game:: Memory Card Utility (PS/PS2) > Create a PS1 memory card. Set it to Slot 1 (Press Triangle while selecting the Memory Card, then Assign it). Note: naming it "Internal Memory Card" sometimes works better than other names. MultiMAN 02.07.07 seems to solve the savegame issues.

=== Changes in MultiMAN 2.07.00/01 for ps1_emu handling ===
These options where needed to make above work:
* Added: LV2 access rights to use LV1 Storage Manager (syscall 864)
* Added: LV1 patch for user access to sys_storage functions (syscalls 600 to 623)

=== Arguments handling===
From multiman.cpp source (line 2502) http://code.google.com/p/multiman/source/browse/source/multiman.cpp?r=8c5b662f1c54d4f95f646949cae3d033b15b1a2e
{{Boxcode|code=<syntaxhighlight lang="c">
{
	char* launchargv[9];
	memset(launchargv, 0, sizeof(launchargv));
	launchargv[0] = (char*)malloc(strlen(mc1)+1); strcpy(launchargv[0], mc1);
	launchargv[1] = (char*)malloc(strlen(mc2)+1); strcpy(launchargv[1], mc2);
	launchargv[2] = (char*)malloc( 5); strcpy(launchargv[2], "0082");
	launchargv[3] = (char*)malloc( 5); strcpy(launchargv[3], "1600");
	launchargv[4] = (char*)malloc(10); strcpy(launchargv[4], app_path);
	launchargv[5] = (char*)malloc( 2); strcpy(launchargv[5], "1");
	launchargv[6] = (char*)malloc( 2); strcpy(launchargv[6], "2");		// full screen	on/off	= 2/1
	launchargv[7] = (char*)malloc( 2); strcpy(launchargv[7], "1");		// smoothing	on/off	= 1/0
	launchargv[8] = NULL;
	unload_modules();
	exitspawn((const char*) "/dev_flash/ps1emu/ps1_netemu.self", (char* const*)launchargv, NULL, NULL, 0, 1001, SYS_PROCESS_PRIMARY_STACK_SIZE_1M);
}

{
	char* launchargv[7];
	memset(launchargv, 0, sizeof(launchargv));
	launchargv[0] = (char*)malloc(strlen(mc1)+1); strcpy(launchargv[0], mc1);
	launchargv[1] = (char*)malloc(strlen(mc2)+1); strcpy(launchargv[1], mc2);
	launchargv[2] = (char*)malloc( 5); strcpy(launchargv[2], "0082");	// region
	launchargv[3] = (char*)malloc( 5); strcpy(launchargv[3], "1200");
	launchargv[4] = (char*)malloc( 2); strcpy(launchargv[4], "1");		// full screen	on/off	= 2/1
	launchargv[5] = (char*)malloc( 2); strcpy(launchargv[5], "1");		// smoothing	on/off	= 1/0
	launchargv[6] = NULL;
	unload_modules();
	exitspawn((const char*) "/dev_flash/ps1emu/ps1_emu.self", (char* const*)launchargv, NULL, NULL, 0, 1001, SYS_PROCESS_PRIMARY_STACK_SIZE_1M);
}
</syntaxhighlight>}}
*Notes:
**The '''''full screen''''' commented argument seems to be the '''Upscaler''' setting available from XMB {{icon category settings}} ⇨ '''[Game Settings]''' ⇨ '''[PS/PS2 Upscaler]''', with values: '''full/normal/off = 2/1/0'''

== Game settings ==

=== External CONFIG file ===
Created/loaded by ps1_newemu.self and ps1_netemu.self at path: '''/USRDIR/CONFIG'''<br>
Example:
<pre>
00000000 1C 00 00 00 50 53 31 45 6D 75 43 6F 6E 66 69 67 ....PS1EmuConfig
00000010 46 69 6C 65 00 97 0A 54 04 00 00 00 01 00 00 00 File...T........
00000020 0F D4 CC B9 10 00 00 00 64 69 73 63 5F 6E 6F 00 ........disc_no.
00000030 04 00 00 00 00 00 00 00 93 D1 5B F8             ..........[.    
</pre>

{| class="wikitable"
|-
! Offset !! size !! data !! notes
|-{{cellcolors|lightgrey}}
| 0x00 || 0x04 || 1C 00 00 00 || size of the next 4 values
|-
| 0x04 || 0x10 || '''PS1EmuConfigFile''' || name/id
|-
| 0x14 || 0x04 || 00 97 0A 54 || ?
|-
| 0x18 || 0x04 || 04 00 00 00 || ?
|-
| 0x1C || 0x04 || 01 00 00 00 || ?
|-{{cellcolors|lightgrey}}
| 0x20 || 0x04 || 0F D4 CC B9 || crc32 of the previous 4 values
|-
| colspan="4" | 
|-{{cellcolors|lightgrey}}
| 0x24 || 0x04 || 10 00 00 00 || size of the next 3 values
|-
| 0x28 || 0x08 || '''disc_no''' || name/id
|-
| 0x30 || 0x04 || 04 00 00 00 || amount of discs
|-
| 0x34 || 0x04 || 00 00 00 00 || disc number
|-{{cellcolors|lightgrey}}
| 0x38 || 0x04 || 93 D1 5B F8 || crc32 of the previous 3 values
|-
|}

*Other posible entries/commands/id
**'''user_memory_size''' ? (in both ps1_newemu.elf and ps1_netemu.elf appears next to ''PS1EmuConfigFile'' and ''disc_no'')

=== Embedded Game settings ===
All the PS1 emulators contains a list of game settings embedded inside his .SELF structure inside 3 tables we could name the '''Checksums Table''', the '''Titles table''', and the '''Commands Table'''. The offsets of this tables differs by emulator revision and type<br><!-- as far i know there is not a known way to find his offsets programatically, other than doing a search for a well known value, usually the first checksum-->
The entry point to read the whole structure of this tables starts by reading the 4 bytes of the first '''Checksum''' of the first game from the checksums table (see below), next 4 bytes are an offset (to read the Titles table), next 4 bytes is a '''Command Count''' and next 4 bytes is a '''Command offset''' (to read the Commands Table), to load the data in the other tables is needed to <abbr title="Or substract 0xFEB0000 in firmware 1.70 and keep in mind the order of the commands table is inverted">substract 0x10000</abbr> to this offsets located next to the checksum of a specific game<br>
The Title IDs (from inside the '''Titles table''') doesnt seems to be used for any logic check, seems to be mostly identifyers (with typos) intended to be displayed in some kind of debug menu in "human readable format" only for informative purposes. Are text strings null terminated in the format "ABCD_123.45" and aligned to 8 bytes, so most of them have a total size of 0x10 but in old firmwares there are some entries with the text "unknown" with a size of 8 bytes (in other words, the entries with the text "unknown" are half the size of the others)<br>
Every command inside the Commands Table is composed by 8 bytes, where the first 4 bytes are the '''Command ID''' (see talk page) and the next 4 bytes is the '''Command Data'''<br>
All the '''Command Data''' values can be considered the most bottom of this hierarchy... except command ID=0x02(netemu 3.40 up to 4.88) containing an offset to a deeper level of the hierarchy where is stored a list with some of the disc sectors for a few libcrypt protected games

==== Game checksum ====
Checksum is simple Adler32 calculated from 2048 bytes of disc data, starting from 0x9318 offset in raw image. Emulator perform check if that sector have CD001 string, if string is missing "unknown" string is used, and hash calculation is not performed. You can use tools like hashtab to easily calculate checksum for new game.<br>
Is calculated using the data contents only (2048 bytes or 0x800h) of the sector 16 (beginning at the 0x9318 of the RAW/2352 image). Every single byte is used in the process. Calculation code does start at 0xC1658 in the ps1_netemu from 4.88 firmware.

<div class="mw-collapsible mw-collapsed">'''Disassembly of the related function'''<pre class="mw-collapsible-content">
loc_C1658:
0xC1658   lwz       r11, -0x7E4C(r2)
0xC165C   lis       r6, -0x7FF9
0xC1660   li        r9, 0x800                           # number of bytes to process. The value is passed to the CTR register next.
0xC1664   li        r0, 1
0xC1668   ori       r6, r6, 0x8071 # 0xFFFFFFFF80078071 # value the bytes are multiplied by
0xC166C   mtctr     r9                                  # set the CTR register for the loop count decrement
0xC1670   mr        r7, r24                             # first offset of the sector data to process moved into the r7 register (0x2DC28C in the RAM).
0xC1674   li        r10, 1                              # set the r10 register to 1.
0xC1678   li        r8, 0                               # set the r8 register to 0.
0xC167C   addi      r15, r24, 0x800                     # last offset of the sector data to process. It does not seem to be used at all.
0xC1680   stw       r0, 0x2640(r11)
loc_C1684:
0xC1684   clrldi    r11, r7, 32                         # move the content from r7 to the r11 (it is the current offset of the byte to process)
0xC1688   addi      r7, r7, 1
0xC168C   lbz       r9, 0(r11)                          # load the byte for calculation
0xC1690   add       r9, r10, r9                         # add r10 to r9
0xC1694   mulhwu    r0, r9, r6                          # multiply the byte by constant and store the high 32 bits of result in the r0
0xC1698   srwi      r10, r0, 15                         # divide the result by 0x8000
0xC169C   slwi      r11, r10, 4                         # multiply r10 by 0x10
0xC16A0   slwi      r0, r10, 16                         # multiply r10 by 0x10000
0xC16A4   subf      r0, r11, r0
0xC16A8   add       r0, r0, r10
0xC16AC   subf      r10, r0, r9
0xC16B0   add       r11, r8, r10
0xC16B4   mulhwu    r0, r11, r6
0xC16B8   srwi      r8, r0, 15
0xC16BC   slwi      r9, r8, 4
0xC16C0   slwi      r0, r8, 16
0xC16C4   subf      r0, r9, r0
0xC16C8   add       r0, r0, r8
0xC16CC   subf      r8, r0, r11
0xC16D0   bdnz+     loc_C1684                           # loop

0xC16D4   lwz       r22, -0x7E4C(r2)
0xC16D8   mr        r3, r22
0xC16DC   lbz       r4, 0xA7(r22)
0xC16E0   lbz       r0, 0xA6(r22)
0xC16E4   slwi      r4, r4, 8
0xC16E8   lbz       r9, 0xA5(r22)
0xC16EC   lbz       r11, 0xA4(r22)
0xC16F0   or        r4, r4, r0
0xC16F4   slwi      r0, r8, 16                         # multiply the r8 by 0x10000 and place the result in the r0 register. It is the higher four bytes of hash.
0xC16F8   slwi      r4, r4, 8
0xC16FC   add       r0, r0, r10                        # add the r10 to r0 - the lower four bytes of hash
0xC1700   or        r4, r4, r9
0xC1704   stw       r0, 0x2640(r22)                    # store the hash
</pre></div>

Super simple python script to calculate checksum, script lack of some checks performed by emu, and is hardcoded to 0x9318 offset, but should be enough.<br>
Usage: edit *your first.bin* to name of your image, run script from CMD. Require python (3?).
{{boxcode|float=left|title=Find_checksum.py|code=<syntaxhighlight lang=python>
import zlib

with open('your first.bin', 'rb') as f:
    f.seek(0x9318)
    suma = zlib.adler32(f.read(2048))
    print (hex(suma))
</syntaxhighlight>}}

==== Game settings access ====
Like mentioned above config is created from 2x u32 values. Lets call first value command, and second value param.<br>
Command is used to calculate address for param, and only param is stored on obtained address.<br> 
Emulator then check for params, and if found (usually when not zero) apply settings based on them.<br> 

Beside functions that read command params directly, every emulator have function (madeup name) ReadInternalConfigValue(u32 command_id). This function take command_id as only variable, and return param in r3 for selected command. This is used widely to read command params, that include libcrypt commands.

<div class="mw-collapsible mw-collapsed">'''Disassembly of the related function'''<pre class="mw-collapsible-content">
0x10BC8                 lwz       r0, 0(r9)       # load HASH
0x10BCC                 cmpw      cr7, r0, r27    # compare title HASH with one from DB
0x10BD0                 bne       cr7, loc_10BB8  # loop till HASH found
0x10BD4                 slwi      r0, r10, 4      # config number << 4 to get offset from first entry in table
0x10BD8                 addi      r24, r1, 0xAB0+var_A40
0x10BDC                 extsw     r0, r0
0x10BE0                 clrldi    r3, r24, 32
0x10BE4                 add       r29, r0, r8     # r29 now points to game entry in config table
0x10BE8                 lwz       r4, 4(r29)      # load pointer to game ID
0x10BEC                 bl        sub_137FF8
0x10BF0                 nop
0x10BF4                 lwz       r28, 8(r29)
0x10BF8                 cmpwi     cr7, r28, 0
0x10BFC                 ble       cr7, loc_10C58  # check config count is not 0 or less
0x10C00                 lwz       r26, 0xC(r29)   # r26 is now pointer to configs for game
0x10C04                 li        r30, 0
0x10C08                 li        r29, 0
0x10C0C                 lwz       r25, off_17B5D8 # "core.c: CoreCheckTitle: param[%d] = 0x%"...
0x10C10
0x10C10 read_conf_loop:                           # CODE XREF: CoreCheckTitle+2DC↓j
0x10C10                 add       r11, r30, r26   # r11 is now pointer to currently read config for game
0x10C14                 addi      r29, r29, 1     # count...
0x10C18                 clrldi    r11, r11, 32
0x10C1C                 mr        r3, r25         # just for print
0x10C20                 addi      r30, r30, 8     # add 8 so next time in loop we read new config (4),
0x10C20                                           # and new params (4) if game have more than one config
0x10C24                 lwz       r4, 0(r11)      # load command
0x10C28                 lwz       r0, 4(r11)      # load params
0x10C2C                 slwi      r9, r4, 2       # r9 = r4 << 2 so shift our command to the left by 2, and store in r9
0x10C30                 clrldi    r5, r0, 32      # just print again
0x10C34                 addi      r9, r9, 0x10    # add 0x10 to shifted command value
0x10C34                                           # to create address where param of config will be stored
0x10C38                 extsw     r4, r4
0x10C3C                 extsw     r9, r9
0x10C40                 add       r9, r9, r31     # r31 is value that change between emu versions. 
0x10C40                                           # That way emulator can keep correct config IDs without changes to table.
0x10C40                                           # r31 0x2B0930 + what we currently have in r9 after previous calculations.
0x10C44                 stw       r0, 4(r9)       # Store param on finally calculated address + 4. For example for config 04
0x10C44                                           # address will be 0x2B0954.
0x10C48                 bl        print_
0x10C4C                 nop
0x10C50                 cmpw      cr7, r28, r29   # r28 overall config count
0x10C50                                           # r29 currently read count
0x10C54                 bne       cr7, read_conf_loop
</pre></div>
Function mentioned above is placed on (in emu memory, 4.86):
* ps1_emu 0x10638
* ps1_newemu 0x12F54
* ps1_netemu 0xB65F0
<!-- strings for printing
CoreCheckTitle: start
CoreCheckTitle: param[%d] = 0x%08xU
CoreCheckTitle: 0x%08xU, "%s" %c
-->

==== Game settings lists ====
<div class="mw-collapsible mw-collapsed" style="background:#ffb0b0; margin:5px 0px">'''TitleID settings hardcoded in ps1_emu.self'''
<div class="mw-collapsible-content" style="text-align:left">{{TitleID settings hardcoded in ps1_emu.self}}
</div></div>{{clear}}

{{TitleID settings hardcoded in ps1_netemu.self}}

<div class="mw-collapsible mw-collapsed" style="background:#b0b0ff; margin:5px 0px">'''TitleID settings hardcoded in ps1_newemu.self'''
<div class="mw-collapsible-content" style="text-align:left;">{{TitleID settings hardcoded in ps1_newemu.self}}
</div></div>{{clear}}

{{Reverse engineering}}<noinclude>[[Category:Main]]</noinclude>