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| HDDLOAD || Update loader for the HDD unit (and later includes the flash device). ||  
| HDDLOAD || Update loader for the HDD unit (and later includes the flash device). ||  
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| HDDOSD || Appears to perform a similar function as the OSD update for SCPH-1xxxx systems. Most likely a build artifact for testing purposes. || SCPH-3xxxx exclusive
| HDDOSD || Not sure what this does, but it is present in the expansion-bay ROMs. ||  
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| HEAPLIB || Memory HEAP LIBrary (i.e. thvpool, thfpool). ||  
| HEAPLIB || Memory HEAP LIBrary (i.e. thvpool, thfpool). ||  
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| OSCLOCK || Contains metadata about the clock module. Used by the old OSDSYS program from ROM v1.00/v1.01. ||  
| OSCLOCK || Contains metadata about the clock module. Used by the old OSDSYS program from ROM v1.00/v1.01. ||  
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| OSDCNF || Contains the IOP boot configuration for OSDSYS (mainly listing the X or P prefixed modules) ||  
| OSDCNF || Contains the IOP boot configuration for OSDSYS (mainly listing the X prefixed modules) ||  
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| OSDSND || OSD sound library. This is a combination of the tentative libraries "libspu2", "libsnd2", "rspu2drv" from the PS2 runtime library, which are mostly ports from the PS1 runtime library. The changes to OSDSND from SCPH-18000 and newer is that it contains improvements to SPU2 AutoDMA code, larger thread stack size, more waits, and a fix to the timer quit code. However, it does not contain the VSync/Alarm based callback code that is in libsnd2 in SDK 1600. ||  
| OSDSND || OSD sound library. This is a combination of the tentative libraries "libspu2", "libsnd2", "rspu2drv" from the PS2 runtime library, which are mostly ports from the PS1 runtime library. The changes to OSDSND from SCPH-18000 and newer is that it contains improvements to SPU2 AutoDMA code, larger thread stack size, more waits, and a fix to the timer quit code. However, it does not contain the VSync/Alarm based callback code that is in libsnd2 in SDK 1600. ||  
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| PDEV9 || DEV9 module for DESR systems used in its OSDSYS program. ||  
| PDEV9 || DEV9 module for DESR systems used in its OSDSYS program. ||  
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| PEESYNC || EESYNC module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PEESYNC || EESYNC module for DESR systems used in its OSDSYS program. ||  
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| PFILEIO || FILEIO module for DESR systems used in its OSDSYS program. ||  
| PFILEIO || FILEIO module for DESR systems used in its OSDSYS program. ||  
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| PHDDLOAD || HDDLOAD module for DESR systems used in its OSDSYS program. ||  
| PHDDLOAD || HDDLOAD module for DESR systems used in its OSDSYS program. ||  
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| PIOMAN    || IOMAN module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PIOMAN    || IOMAN module for DESR systems used in its OSDSYS program. ||  
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| PIOPRP    || IOPRP 3.1.0 used for the PS3 ps2_emu OSDSYS program. ||  
| PIOPRP    || IOPRP 3.1.0 used for the PS3 ps2_emu OSDSYS program. ||  
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| PLIBSD    || LIBSD module for DESR systems used in its OSDSYS program. ||  
| PLIBSD    || LIBSD module for DESR systems used in its OSDSYS program. ||  
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| PLOADCORE || LOADCORE module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PLOADCORE || LAODCORE module for DESR systems used in its OSDSYS program. ||  
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| PLOADFILE || LOADFILE module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PLOADFILE || LOADFILE module for DESR systems used in its OSDSYS program. ||  
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| PMCMAN    || MCMAN module for DESR systems used in its OSDSYS program. ||  
| PMCMAN    || MCMAN module for DESR systems used in its OSDSYS program. ||  
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| PMODHSYN  || MODHSYN (part of CSL) module for DESR systems used in its OSDSYS program. ||  
| PMODHSYN  || MODHSYN (part of CSL) module for DESR systems used in its OSDSYS program. ||  
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| PMODLOAD  || MODLOAD module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PMODLOAD  || MODLOAD module for DESR systems used in its OSDSYS program. ||  
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| PMODMIDI  || MODMIDI module (part of CSL) for DESR systems used in its OSDSYS program. ||  
| PMODMIDI  || MODMIDI module (part of CSL) for DESR systems used in its OSDSYS program. ||  
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| PRMMAN2  || RMMAN2 module for DESR systems used in its OSDSYS program. ||  
| PRMMAN2  || RMMAN2 module for DESR systems used in its OSDSYS program. ||  
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| PROMDRV  || ROMDRV module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PROMDRV  || ROMDRV module for DESR systems used in its OSDSYS program. ||  
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| PS1DRV || The PlayStation driver. Sets up the EE for GPU emulation and resets the IOP into PS1 mode. ||  
| PS1DRV || The PlayStation driver. Sets up the EE for GPU emulation and resets the IOP into PS1 mode. ||  
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| PSDRDRV    || SDRDRV module for DESR systems used in its OSDSYS program. ||  
| PSDRDRV    || SDRDRV module for DESR systems used in its OSDSYS program. ||  
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| PSIFCMD    || SIFCMD module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PSIFCMD    || SIFCMD module for DESR systems used in its OSDSYS program. ||  
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| PSIFMAN    || SIFMAN module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PSIFMAN    || SIFMAN module for DESR systems used in its OSDSYS program. ||  
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| PSIO2MAN  || SIO2MAN module for DESR systems used in its OSDSYS program. ||  
| PSIO2MAN  || SIO2MAN module for DESR systems used in its OSDSYS program. ||  
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| PSTDIO    || STDIO module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PSTDIO    || STDIO module for DESR systems used in its OSDSYS program. ||  
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| PSXVER    || Version of the ROM for DESR system. ||  
| PSXVER    || Version of the ROM for DESR system. ||  
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| PSYSCLIB  || SYSCLIB module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PSYSCLIB  || SYSCLIB module for DESR systems used in its OSDSYS program. ||  
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| PSYSMEM    || SYSMEM module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PSYSMEM    || SYSMEM module for DESR systems used in its OSDSYS program. ||  
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| PTHREADMAN || THREADMAN module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PTHREADMAN || THREADMAN module for DESR systems used in its OSDSYS program. ||  
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| PTIMEMANI  || TIMEMAN module for DESR systems used in its OSDSYS program; code identical to IOPRP 2.8.0. ||  
| PTIMEMANI  || TIMEMAN module for DESR systems used in its OSDSYS program. ||  
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| PXATAPI || ATAPI driver for the (the DVD writer of the) PSX. TXATAPI is used by TESTMODE of the PSX. ||  
| PXATAPI || ATAPI driver for the (the DVD writer of the) PSX. TXATAPI is used by TESTMODE of the PSX. ||  
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| TIMEMANP || Timer Manager (PS mode) ||  
| TIMEMANP || Timer Manager (PS mode) ||  
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| TIOPIMG || Modified IOPRP 2.8.0 used in DESR TESTMODE. ||  
| TIOPIMG || IOPRP 2.8.0x used in DESR TESTMODE. ||  
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| TPADMAN || PADMAN used by rom0:TESTMODE. ||
| TPADMAN || PADMAN used by rom0:TESTMODE. ||
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