Gregory's Server@kenshirriff How similar was the 8088 bus to that of the 8085?
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2 comments
 @kenshirriff Thank you. I thought perhaps it helped engineers use (readily available?) 8085 support chips and adapt existing 8-bit boards to run 16-bit code (a bit like the 80386sx let you build an AT that could run 32-bit code), albeit more slowly. |
@lopta The 8085 and 8086 buses were pretty similar. I think Intel wanted to make migration to the 8086 easier. Of course there were some differences since the 8086 has a 20-bit address bus and the 8085 has a 16-bit bus. But they used the same concepts: INTR/INTA for interrupts, HOLD/HLDA for bus hold, similar T state timing, similar status bits, and so forth.