On 05/12/2019 14:13, Gerrit Heitsch wrote: > >> The 8501 still contains some left overs of the SYNC at the top where >> the bias generator >> now resides. Therefore I guess that it came first or at the same time >> as the 8500 >> jsut has some wires removed or cut (compared to the 8501). > > Not quite.. Bit 5 of the I/O-Port does not exist on the 8501 die while > the 6510 and 8500 contain a full 8Bit port, you can set and read all 8 > Bits on them (*). So there must have been a few more changes between > 8501 and 8500. > No. Look at the dies yourself -> No other changes - except the ones mentioned and the missing port bit. I still hold to my assumption that the masks for the 8500 were derived from the 8500 masks.Received on 2020-05-29 23:44:38
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