[vcf-midatlantic] An Atari internals question

Gregg Levine gregg.drwho8 at gmail.com
Sat Mar 9 07:19:33 UTC 2024


Hello!
A long since closed shop in Manhattan sold me a collection of items
wearing legends for the Atari families of hardware. One such was the
MMU for the computers that company made. Running the part number of
CO61618
 through Google sent me off to a website that presented me with the
information regarding what it did. I sent them back a note that the
part was in fact a HAL16L8 part, and started off as 99 PAL16L8, (I
found out years earlier that after the first 100 part numbers ordered,
the company could commision a mask for making them up that way.), any
this site,
https://www.atarimax.com/jindroush.atari.org/achip.html

provided all of the other information needed to ID the other parts.
Except they did not help me to elucidate what the terms on the MMU
meant. One of them was the use of PB0 and PB1. Now I know of those
from the SY6522 IO chip for the SY6502 CPU.

Would one of you who is more familiar with the way the Atari computers
work know if they were using an SY6522 that way?
 -----
Gregg C Levine gregg.drwho8 at gmail.com
"This signature fought the Time Wars, time and again."


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