I believe this datasheet, for the OKI MSM80C85A, is what you want to be working from if you want to be electrically correct: https://archive.org/details/Oki-MicrocomputerDatabook1984OCR/page/n149/mode/2up
The AH model (MSM80C85A*H*) appears to be an improved version that can run at 5 MHz (instead of 3) and has wider electrical tolerances. I believe you could drop one into a Model T and have it work, but I don't know how it would affect your battery life. (Should be the same, but I remember hearing that Intel's 8085AH was a version of 8085A that was faster but used more power.) It doesn't appear that Intel manufactured a CMOS version of their 8085 chip, but if you don't care about the electrical levels right now and just want to learn how the chip functions, particularly how it is supposed to be hooked up with support chips to form a computer, then you can hear it from the horse's mouth here: https://archive.org/details/Mcs80_85FamilyUsersManual/mode/2up —b9 On Mon, Dec 29, 2025 at 9:04 PM B9 <[email protected]> wrote: > Isn't it an 80C85A, not AH? > > > On December 29, 2025 8:55:38 PM PST, [email protected] wrote: > >> I'm studying our beloved model t and have been reading over various >> datasheets. I believe the datasheet currently being referenced is proper >> with regard to our CPU, but I'd like confirmation please: >> >> OKI Semiconductor >> MSM80C85AHRS/GS/JS >> Version: Jan 1998 >> Document E2O00009-27-X2 >> >> I checked the bitchin wiki and the documentation list on club100 before >> asking here. >> >> Ref: https://da.gd/67ZOF >> >> Daniel >> sysop | Air & Wave BBS >> finger | [email protected] >> >>
