8" floppy project

On Fri, Jul 30, 2004 at 01:59:32AM +0100, Davison, Lee wrote: Yep... there's a detailed picture of the cycle interleave with various DMA events and processor accesses in the system documentation (probably the Hardware RKM, but I don't have it here to check). What happens in cases of heavy custom-chip access is that the processor gets starved for cycles, much like the processor is held off on Classic Mac designs anytime the video is being painted (giving a 8MHz Mac Plus an equivalent performance to a 5MHz chip). The difference is that with the Amiga, the only time this happens is a) when accessing CHIP RAM (as opposed to ROM or FAST RAM), and b) when using some of the higher resolutions and/or deeper bitplane modes (32 colors, HAM, etc.) When tooling around on the default workbench, the processor is running at full speed. -ethan -- Ethan Dicks, A-130-S Current South Pole Weather at 30-Jul-2004 01:40 Z South Pole Station PSC 468 Box 400 Temp -89.2 F (-67.3 C) Windchill -123.3 F (-86.3 C) APO AP 96598 Wind 7.2 kts Grid 085 Barometer 661.8 mb (11319 ft) Ethan.Dicks(a)amanda.spole.gov http://penguincentral.com/penguincentral.html