On 2009-12-21, at 12:10, Dzonatas Sol wrote: > Only when they came out with pseudo-fast memory, which made the > difference between "Fast RAM" and "Slow RAM" based on what the CPU > controlled.
Amiga "fast" memory was memory that wasn't shared with the Blitter, and copying ROM to RAM was not just on the Amiga. RAM overtook ROM in performance in the early '80s. > The CPU & Blitter locked memory, this was known as Chip RAM, which > is analogous to DMA on i386 based CPUs. Psuedo-fast was fast because > the Chip-set (blitter) did not lock it. Remember that your billboard > idea for avatar imposters was actually all done as hardware sprites > on the Amiga. But that's not why the blitter made the Amiga fast, it was an implementation detail caused by the way the 68000 took two cycles to access memory. > That was optional. As you can see many people used Kickstart ROM > chips instead of diskettes. http://en.wikipedia.org/wiki/Amiga_500#Memory_map That happened later. The kickstart was an absolute necessity in the Amiga 1000, 2000, and 3000. You're mixing up all kinds of different concepts here, none of which are meaningful in a VM environment. Do remember who said "an OS without virtual memory is an OS without virtue", and why he stopped? _______________________________________________ Policies and (un)subscribe information available here: http://wiki.secondlife.com/wiki/SLDev Please read the policies before posting to keep unmoderated posting privileges
