4 ms·
Due to the way the video is interleaved with CPU cycles, you'd have to do something like divide the 1 MHz CPU clock by 20, and then when writing carefully only
by pulvinar 3y ago
Due to the way the video is interleaved with CPU cycles, you'd have to do something like divide the 1 MHz CPU clock by 20, and then when writing carefully only put data on the data bus for one of those 20 cycles. And the disk accesses would surely fail due to the CPU not keeping up, among other problems.
http://www.apple-iigs.info/doc/fichiers/TheappleIIcircuitdescription1.pdf http://www.apple-iigs.info/doc/fichiers/TheappleIIcircuitdes...
- anyfoo 3y agoThinking more and more about it in this thread (yes, I'm procrastinating doing something else), I'm beginning to come to the conclusion that the way with the least modifications to the computer itself is to replace the DRAM with SRAM, and to "just" slow the video circuit down as well (including color burst, horizontal scan, etc.), but to attach a custom buffered display instead of a regular monitor to the computer. However, I wouldn't be surprised in the slightest if any other of the integrated circuits don't work at the slower speed for some reason. (Filters etc. you'd just replace/retune.)