On 12/28/2016 01:06 PM, smf wrote: > The 8500 only has P0-P5 bonded out. > > I've not seen an 8501 die shot, but I assumed the 8 bits were all there > and they only bonded out P0-P4 & P6-P7. It had to fit in a 40 pin chip > and they also dropped NMI & Phi2 out. For the 8501 die shots go here: http://visual6502.org/images/pages/MOS_8501_die_shots.html > It would have made more sense if the 6510/8500 bonded out P0-P3 & P6 & > P7, as you could use N & V flags after an LDA for branching based on > P6/P7 without any comparison instruction required. Yes, and you can see the 2 unused pads for P6 and P7 on the die of the 8500. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2016-12-28 17:00:02
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