HP41 assembler vs. HP71 assembler ?

HP41 assembler vs. HP71 assembler ?

Postby floppy_stuttgart » Mon Jul 08, 2024 1:19 pm

Hello,
can somebody explain how the differences are and if/how ASM from HP41 could be transfered to HP71?
My point:
a) find HP41 ASM where RCL* or ST- are defined (I am still searching)
b) read it and make a transfer for having an HP71 Forth word
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Re: HP41 assembler vs. HP71 assembler ?

Postby pcscote » Tue Jul 09, 2024 7:25 pm

floppy_stuttgart wrote:can somebody explain how the differences are and if/how ASM from HP41 could be transfered to HP71?

You cannot transfer HP-41 assembly code to the HP-71, not the same OS nor the same CPU family.

The HP Nut CPU (HP-41C/CV/CX & Voyagers) is the last 1-bit bus CPU that began with the HP-35, while the HP Saturn CPU (HP-71B) is the first 4-bit bus CPU that began with the HP-71B and ended with the HP-49 (NEC made Saturn CPU, HP-48S/SX was the last calculators to use HP made Saturn CPU).

floppy_stuttgart wrote:a) find HP41 ASM where RCL* or ST- are defined (I am still searching)

FYI, HP-41 does not have recall arithmetic (RC+, RC-, etc), only store arithmetic (ST+, ST-, etc)

floppy_stuttgart wrote:b) read it and make a transfer for having an HP71 Forth word

Why not decompiling HP-41 Translator FORTH words to see how Bill Wickes implemented them ?

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