Thank you much. I was convinced it was the same, just didn't know what the
HRS/GS/JS meant.
I will print out the link and chuck the one I had printed. Glad I didn't
study too deeply into it and asked first.
Daniel
sysop | Air & Wave BBS
finger | [email protected]
On Tue, 30 Dec 2025, B 9 wrote:
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 (MSM80C85AH) 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 prop
er 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]
