Hi, I am just thinking about rev-engineering and maybe emulating the Playchoice 10. There is a PC10 service manual with complete PC10 schematics, and MAME includes PC10 emulation source code - so getting the hardware specs together should be no big problem. But two questions on the software side:
Is there anything known on the INST ROM format?
It contains Instruction texts, and some program code, and this or that other stuff - but I don't know yet what is where.
Is there already a ROM-image format for PC10 games?
The iNES header includes a flag for indicating the presence of the INST ROM - but not for the RP5H01 PROM. The PROM is, I think, required for decrypting the game title (and maybe also for other data in the INST ROMs, like maybe the Instruction text...?).
So far, the iNES format looks incomplete - having only the encrypted INST ROM but not the PROM decryption key - looks rather useless to me (unless there's a way to decrypt the data without the PROM?).
Is there anything known on the INST ROM format?
It contains Instruction texts, and some program code, and this or that other stuff - but I don't know yet what is where.
Is there already a ROM-image format for PC10 games?
The iNES header includes a flag for indicating the presence of the INST ROM - but not for the RP5H01 PROM. The PROM is, I think, required for decrypting the game title (and maybe also for other data in the INST ROMs, like maybe the Instruction text...?).
So far, the iNES format looks incomplete - having only the encrypted INST ROM but not the PROM decryption key - looks rather useless to me (unless there's a way to decrypt the data without the PROM?).