Re: HP98x0 machine code info? Message #2 Posted by Rick Bensene on 24 Mar 2003, 11:33 p.m., in response to message #1 by Tony Duell (UK)
One of the patents for the 9820 has a complete listing of the microcode for the machine. The architecture of the processor is very similar to the early HP 211x CPU's.
From reading through the listings, it's possible to figure
out the instruction set. The listings contain both the assembly code, as well as the machine code.
I haven't studied it deeply enough to generate an instruction set listing, but I'm sure that there's enough
information there to figured it all out.
The patent number is 3839630. You can get to it at espacenet.com, all you need is a PDF viewer.
Hope that this helps!
Rick Bensene
The Old Calculator Web Museum
http://oldcalculatormuseum.com
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