Following that appears to be a primitive shell of some sort. At offset 0圎288 is a string which all PIO equipment must return to the console in order to have code execution passed to the device. The PIO (Parallel Input/Output) feature was intended to be used for debugging, but was exploited to boot unsigned code on such devices such as the Action Replay. It contains information related to the PlayStation kernel and boot process as the console loads.Ĭopyright 1993,1994 (C) Sony Computer Entertainment Inc. Normally unseen when using a real PlayStation, the following text is generated for console output when using the PCSX emulator, and possibly a devkit as well. Hidden in the BIOS at 0x129 is a small string Unless noted otherwise, all addresses noted below are for the SCPH-1001 revision. Variables beginning with a "%" are format variables. It appears to have been compiled to MIPS using the C language. The BIOS contains a heaping of what appears to be debug console output, either used during the console's development, or used for game development on the console. 2.2 System Menu Differences and Similarities.
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