> The problem with Fujitsu is that documentation tends to be quite difficult to find > regarding their more obscure ICs, and they made a lot of semi-custom products for > various arcade manufacturers (which go all the way back to the MB14241 barrel shifter > on the black-and-white Midway/Taito games) for which little to no official > documentation has ever been published. It's part of the reason why Sega Model 1/2 > emulation has been such a difficult struggle. > > (PCB maintainers also curse the failure rate of Fujitsu TTL chips, but that's a > different subject entirely.)
Tell me about it. I already explained the MB89372 multi protocol controller has no official documentation (and Namco using this chip for their C139).
Edit: With great design comes lack of documentation. It was a bold move of Fujitsu to not include documentation on some of their products. Despite this, I still think this isn't as bad as Midway V Unit (and possibly Zeus) linking hardware.