Anima wrote:Do you know the cycle numbers for clearing? I thought it was 4 cycles on both Blitters...
Edit: now I know what you mean: because the CPU is clocked at 8 MHz makes the Atari Blitter faster
Faster Atari bus is one factor, the other one is a buggy amiga chipset.
Amiga blitter needs one idle cycle per each copying/clearing word. It means that copy takes 3 bus cycles and clearing takes 2 bus cycles per word.
Therefore, during the border area (when video DMA is off) clearing takes 4 CPU cycles per word and on the visible area 8 CPU cycles per word. It is valid for 4 bitplane mode, and each additional bitplane increases copy/clearing process by further 2 CPU cycles per word.
In case of the Atari, it is always 4 CPU cycle per each word.