most modern design for an HP41 rom module?

[ThomasF]

(08-06-2024 02:34 AM)John Ioannidis Wrote:  Thanks, but not useful if you don't publish the software! I'd be making my own PCB anyway.

I gave a lot of hints on where to start looking.
Both me and Meindert has made our own PCBs after reading the original post, see the following link: https://www.hpmuseum.org/forum/thread-20...light=Pico
Andrew published both the schematic and the software which we have based our own development on. I would happily share my code if someone really was interested, but since it is not meant for distribution (yet) and so far only for my own testing and verification - please note that this is really still work in progress - I have not published it.

As Monte said, the voltage specification, but also the possibility to enable each bus line separately, which is useful in some cases. After some testing we ended up with 4050 and the 40109, but there are certainly other options as well.

Cheers,
Thomas