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The best way is to get an HP-IL interface for your Mac i. e. a PIL Box by J.-F. Garnier: http://www.jeffcalc.hp41.eu/hpil/index.html
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Both Linux and DOS are capable of reading and writing LIF diskettes (on bare-metal, not in a VM). If you can find an old DOS machine you can use LIFUTIL. There is also a lifutils (C source) for Linux.
Another alternative would be the PIL-Box (USB to HP-IL).
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Thanks for the responses everyone. I'm presently waiting for delivery on a USB/floppy drive that supposedly supports the old DS/DD format. I've been working on the C code of some Linux LIF utilities and have them ported to the Mac and working with LIF images on disk. The next step will be getting the LIF images copied to a physical floppy in the correct format.
In the meantime, I have another question. I have a FORTH/ASSEMBLER ROM (5061-7234) that seems to be defective. Whenever I enter the the >FORTH command to go into FORTH mode, I get either an immediate MEMORY LOST message or an HP-71 FORTH 1A message that hangs indefinitely. I've tried all INITs, battery pulls, etc. to reset things but nothing seems to help. Is this a defective ROM or is there something simple I'm missing here? C programming I can do, but I'm totally new to the 71B's FORTH environment.