On Fri, Dec 25, 2015 at 2:10 AM, Paul Birkel <[email protected]> wrote: > Report back with your findings :->!
OK. I'm really much more interested in the Pascal Microengine firmware, but I'm starting with the LSI-11 because it's the same chipset and better documented, so I can more easily gain practical experience with its microcode, then move on the the PM. At first I thought the microinstruction example in my previous email was to decode the 000000-000007 (octal) instructions, which are HALT, WAIT, RTI, BPT, IOT, RESET, RTT, and unused. That's possible, and it may make sense that RTI and RTT jump to the same routine, but it seems unlikely that the unused opcode should jump there.
