miner@dino.cpe.ulowell.edu (Rich Miner) (09/25/87)
Question for CBM Engineers, or anyone else in the know: On an A1000 DMA cycle, initiated by a coprocessor plug in card, DTACK appears during the S4 68000 state. On the B2000 DTACK appears much earlier ie during S2 (only 20ns after the address strobe of the coprocessor DMA cycle). Is DTACK issued earlier on the B2000 than the A1000? I realize that that this behavior is still within the specified limits, but it just seems so much faster than the A1000 that is was a surprise. -- Rich miner@ulowell.edu 617/452-5000x2693 ULowell CPE Imaging Research Lab