Author: Tom Kerrigan
Date: 11:30:43 03/10/00
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On March 10, 2000 at 13:34:30, Eugene Nalimov wrote: >On March 10, 2000 at 03:21:31, Tom Kerrigan wrote: > >>On March 09, 2000 at 23:07:17, Robert Hyatt wrote: >> >>>that's the wrong way to measure this. the 8080 was a 16 bit cpu if you use >>>that logic. The 68000 had a 16 bit bus. I taught hardware design courses at >> >>16 bit external data bus, yeah. But how wide were the register busses? How wide >>was the ALU? I believe the answer to both questions is 32-bit. > > add.w d0, d1 - 4 clocks > add.l d0, d1 - 6 clocks I'm not sure what this suggests. If the 68000 was purely 16-bit, it seems like add.l would take twice as long as add.w. So maybe there's a 32-bit register bus that gets staged before the 16-bit ALU, or something. Or the other way around, but that seems less likely. -Tom
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