For Sale: HP-71B MultiMod ROM Emulator

[mfleming]

Hi everyone,

The MultiMod ROM Emulator board and optional 3D printed enclosure is now available to those interested in a means of hosting ROMs for your HP-71B. Attached you'll find an order form to fill out and send in for each board you would like. Although you need one form per board, multiple orders will be consolidated into a single shipment. You'll receive confirmation of the order submitted within 24 hours, along with an outline of what will follow. Fill out, save, and send a completed PDF order form to

hp71multimod@gmail.com

The board itself is $65 with free USPS Express Shipping for those in the States. An enclosure can also be included with the order for an additional $20. Shipping outside the U.S. is by USPS First Class Package for an additional $6. I highly recommend the enclosure! Contact Dan directly (twoweims) if you want to separately order an enclosure in a different color or lettering scheme.

There is an additional attachment for a programming sheet for the MultiMod based on an idea from Dan Simpson. The programming pad makes it easier to lay out the ROMs and list the serial monitor commands needed to set up your MultiMod. A couple of examples are given to get you started. Have a look to see what is involved in building your own ROM set.

You can find ROM data files, support scripts, manuals, etc. in the following github repository

https://github.com/mafleming/HP71MultiMod

There are a few things that need to be added or updated in the repository, but you'll find everything there you need now to get started. Source code will follow as the ragged edges get hammered out (formatting & comments, not code!). Eventually schematics and Gerbers will follow.

I'm having quite a time with my newly available ROMs and I hope you will too!
~Mark


Many of you may already have the necessary USB to TTL serial interface cable but here are a few suggestions for those who don't. First up, the ubiquitous 4-wire cable with 5V Vcc, Ground, and 3.3V transmit/receive signals. This will work perfectly well for the task.
https://www.amazon.com/JBtek-WINDOWS-Sup...255&sr=8-2

More versatile serial interfaces can be found in some of the posts below. Either of the DSD Tech adapters can be used for other purposes if you dabble in Arduino programming. I would recommend any of those using an FTDI chip.
https://www.amazon.com/s?k=dsd+tech+usb+...2_ts-doa-p


Edit: Updated Order Form font
2nd edit: For those having problems with the LibreOffice Liberation Sans font, all appears fine on my end. I've replaced the font with Times New Roman and updated the form.
3rd Edit: Liberation Sans font finally stamped out!
4th Edit: Add USB serial suggestions.
5th Edit: Updated MultiMod-ProgrammingPad document. Always check github repository for latest version at
https://github.com/mafleming/HP71MultiMod