This is not unlike how 'fast' screen updates are done on the Apple IIGS. The fastest memory operations on the 6502 and 65816 involve the stack, so one ends up m

This is not unlike how 'fast' screen updates are done on the Apple IIGS. The fastest memory operations on the 6502 and 65816 involve the stack, so one ends up mapping the stack to the top of framebuffer RAM and pushing a lot of values onto it in an unrolled loop. The unrolled loop is itself rewritten by other code to provide the data for the next update. Apple developer support themselves described this idea in Technote #70, http://www.1000bit.it/support/manuali/apple/technotes/iigs/tn.iigs.070.html http://www.1000bit.it/support/manuali/apple/technotes/iigs/t...