Editing Talk:CXD9208GP
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If you are looking for most misunderstood chip on COK-001, here it is. Someone made here really wrong assumption, thinking that this chip is connected to | If you are looking for most misunderstood chip on COK-001, here it is. Someone made here really wrong assumption, thinking that this chip is connected to | ||
CXM4024R. So, what we got here? IOP. Yup, ps2 Input/Output processor, just like mentioned above. Very special, and very stripped most likely PPC405 based IOP. Most important hint about supposed connection to multiAV being wrong, is fact that there is no single trace on motherboard that really goes there. Neither on top or bottom of mainboard, sure i didn't delayered COK-001 motherboard, but just look also at CXM4024R. There is no connection there, and pinout is rather visible. Next thing is visual comparison of COK-001 with PS2 GH-051 which use EE+GS with the same pinout as PS3 version.<br> | CXM4024R. So, what we got here? IOP. Yup, ps2 Input/Output processor, just like mentioned above. Very special, and very stripped most likely PPC405 based IOP. Most important hint about supposed connection to multiAV being wrong, is fact that there is no single trace on motherboard that really goes there. Neither on top or bottom of mainboard, sure i didn't delayered COK-001 motherboard, but just look also at CXM4024R. There is no connection there, and pinout is rather visible. Next thing is visual comparison of COK-001 with PS2 GH-051 which use EE+GS with the same pinout as PS3 version.<br> | ||
PS2: https:// | PS2: https://imgur.com/yC5XQuG<br> | ||
PS3: https://www.psdevwiki.com/ps3/images/9/9d/COK-001_TOP.JPG<br> | PS3: https://www.psdevwiki.com/ps3/images/9/9d/COK-001_TOP.JPG<br> | ||
Similar, isn't it? All traces that on PS2 goes to IOP, on PS3 go to that chip. More than that IOP used in PS2 have part number CXD9209GP, our chip is CXD9208GP.<br> | Similar, isn't it? All traces that on PS2 goes to IOP, on PS3 go to that chip. More than that IOP used in PS2 have part number CXD9209GP, our chip is CXD9208GP.<br> | ||
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Why ps1_emu don't used it then? Answer is simple, is not efficient. First thing, this version seems to be stripped from PS1 only hardware, which probably allowed to reduce cost. But even if we had there full PPC405 from ps2, this is still bad idea to use it for PS1 emulation. Deckard assume that instead of PS1 GPU, there is PS2 EE that emulate it. So PS1 emulation need to involve PS2 EE, and that in turn need PS2 GS, which need to talk to PS3 RSX to display something. It was just simpler to write PS1 emulator from scratch, and don't involve PS1 mode from PS2 into that. --[[User:Kozarovv|Kozarovv]] ([[User talk:Kozarovv|talk]]) 10:14, 4 October 2022 (UTC) | Why ps1_emu don't used it then? Answer is simple, is not efficient. First thing, this version seems to be stripped from PS1 only hardware, which probably allowed to reduce cost. But even if we had there full PPC405 from ps2, this is still bad idea to use it for PS1 emulation. Deckard assume that instead of PS1 GPU, there is PS2 EE that emulate it. So PS1 emulation need to involve PS2 EE, and that in turn need PS2 GS, which need to talk to PS3 RSX to display something. It was just simpler to write PS1 emulator from scratch, and don't involve PS1 mode from PS2 into that. --[[User:Kozarovv|Kozarovv]] ([[User talk:Kozarovv|talk]]) 10:14, 4 October 2022 (UTC) | ||