Cyprian wrote:actually, those "64 cycles" in BLIT mode (Non-HOG) aren't correct.
In case of MegaST/ and STE it is 260 CPU cycle interval - 252 cycles (63 BUS cycles) plus 8 cycles for bus mastering.
in case of MSTE it is 264 CPU cycles - 252 plus 12 bus mastering cycles.
And moreover, BLiTTER in BLIT mode can be slowed-down by a long CPU instruction, like MUL/DIV/bit shift ect.
Oups BUS cycles indeed :$
In case you are in HOG + force blitter restart to speed up blitting, you are sure you do not execute a long instruction.
But in case an interrupt happens (to remove the border) I suppose you have to stop the blitter and go on after... That does not sound so simple.