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Processor Instruction Sets
09-03-2021, 11:05 PM (This post was last modified: 09-03-2021 11:07 PM by Mike T..)
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Processor Instruction Sets
I'm trying to finish a project I started a very long time ago and have recently spent sometime looking at the listings of the ROMs for the Classic, Woodstock, and Spice series and was rather surprised to discover that although they all use the ACT processor some opcodes are not the same.

HP35
Code:

1377    if n/c go to 0277 (same)
0552    c - 1 -> c[x]     (different)

HP33
Code:

1377    if n/c go to  5677 (same)
0552    c + c -> c[xs]     (different)

Are these differences actually documented anywhere (outside of the source code to simulators like Nonpareil)? It is very confusing!

Mike T.

HP21, HP25, HP32E, HP33C, HP34C, HP10C, HP11C, HP12C, HP32S, HP22S
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Messages In This Thread
Processor Instruction Sets - Mike T. - 09-03-2021 11:05 PM
RE: Processor Instruction Sets - teenix - 09-04-2021, 12:57 AM
RE: Processor Instruction Sets - Mike T. - 09-04-2021, 04:03 PM
RE: Processor Instruction Sets - teenix - 09-05-2021, 12:40 AM
RE: Processor Instruction Sets - Mike T. - 09-07-2021, 02:37 PM
RE: Processor Instruction Sets - Mike T. - 09-26-2021, 10:53 PM
RE: Processor Instruction Sets - teenix - 09-09-2021, 06:12 AM
RE: Processor Instruction Sets - teenix - 09-09-2021, 11:29 PM
RE: Processor Instruction Sets - Mike T. - 09-09-2021, 06:54 PM
RE: Processor Instruction Sets - teenix - 09-09-2021, 11:30 PM
RE: Processor Instruction Sets - teenix - 09-26-2021, 11:37 PM
RE: Processor Instruction Sets - brouhaha - 10-03-2021, 07:26 PM



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