For Sale: HP-71B MultiMod ROM Emulator

[rprosperi]

ROM updated, I'm good to go, the process is amazingly easy and quick. Now to go tweak the contents of the ROM images, there's still ROM space in the JPC image and I use a slightly different ML program.

Some troubleshooting suggestions for others trying to do the update:

A. Do not connect the RTS line of the USB interface to the MCLR pin on the board. The manual suggests this is optional, but is NOT needed and will prevent the serial connection from working (it is used when updating the f/w of the board itself, which will most likely never be needed by most users).

B. You may have to power-cycle the MM board after failing to connect (pull the J2 jumper off for 5+ seconds, then replace) to get it to respond to the serial interface. Some have reported it's not necessary, while for me it was. This probably has to do with which USB/serial interface you use and the exact sequence of connecting things, but if you can't seem to connect, just power-cycle and you'll probably be OK.

The above comments were confirmed by Mark.