> The Apple II took advantage of the speed difference between CPU and DRAM and designed the video hardware to read from memory every other memory cycle, interleaved with CPU memory access.
Same for the C64. Sometimes it was necessary to read slightly more than that for video display though, so the VIC (video chip) had to pause the CPU for a bit sometimes, resulting in so called "badlines".
Same for the C64. Sometimes it was necessary to read slightly more than that for video display though, so the VIC (video chip) had to pause the CPU for a bit sometimes, resulting in so called "badlines".