I'm not the poster you replied to. This kind of info, if available, will mostly be very arcane and hard for non-emulator-programmers to make sense of. It is usually collected by reverse-engineering by hobbyist programmers (most console emulators are made by hobbyists out of personal interest, not by commercial companies). Lists of the BIOS functions are available, but with a few minutes of digging, I was not able to find any English docs with detailed descriptions of what they do. (As we know, Connectix had to reverse-engineer to find out that detailed information.)

Anyway, I found this site which has a couple links with BIOS information on them: system call list (japanese) and how to invoke the system calls (BIOS functions)

Zophar 's site has some documentation about the PlayStation, that also includes a list of the BIOS functions (in the HTML version, near the bottom).

Also, only tangentially related: while searching, I stumbled on this PDF document about techniques that are useful for developing emulators. I haven't read it, but a brief glance at a few pages suggests that it might be pretty useful for someone who already knows some programming and wants to learn how to write an emulator. (Writing emulators is a difficult and time-consuming process, and you end up having to absorb huge amounts of extremely technical and obscure detail, about the hardware you are trying to emulate. Its a great challenge.)

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