The guy who developed Retroshields has options to put a number of processors (just the processors like a Z80, MC6803, 8085 etc) on a plugin board for a Arduino Mega, and is using the Arduino to control the CPU fully, clocking it in AVR software, providing ram/rom for it etc. So it basically provides the address space for it. I that case I would just set some MC6801 code to do a blockmove to the 'RAM' of the AVR, and export that as intel Hex or S19.
I do have most parts (including the GAL) as an alternative to that with this project:??so I could go that route - it would help too to read the chip. Are there more instruments HP made which use that controller?
Maurice
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Maurice Smulders