Latest update on decapsulation of CPS2 and CPS3 ICs.
CPS2 game "cartridge":
DL-1525 (SPA). 208 pin plastic QFP. Die marking is E38M with moto copyright.
This is a Motorola gate array, with a massive standard cell of a 68k plopped down in one corner of it (takes up around a quarter of the die). All the interconnects from this standard cell to the rest of the array are clearly visible (looks like they just took a 68k die mask, and dropped it onto the asic mask). Should be within realms of possibility to work out at least the more direct connections from the 68k to the ASIC i/o pads.
CPS3 motherboard:
DL-2729 (PPU). 304 pins plastic QFP. No visible die markings. Due to the package marking style, I believe this to be a Toshiba asic based design.
This is a massive die, that appears to be the main graphics processor.
DL-2829 (CCU). 208 pins plastic QFP. Toshiba die marking. No ID number.
This appears to be a typical Toshiba full custom ASIC.
DL-3329 (SSU). 144 pins plastic QFP. Toshiba die marking. No ID number.
This appears to be a typical Toshiba full custom ASIC.
That's all for now.
Cheers
Pete