sicklittlemonkey wrote:
What am I missing here?Nothing. It must have had a cache, and did. ;-) Early accelerator cards cached all of RAM, I think. Apple copied the ZIP design for the //c+. (Right guys?) What I would like to know is the write-back policy for the cache. I'm guessing that graphics writes were propagated immediately. That could be tested by running some code in displayed memory.
It's a strict write-through cache. This is necessary since the tag RAM does not contain "dirty" bits. -michael Music synthesis for 8-bit Apple II's! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it is seriously underused."