These exact clones of vintage HP calcs are on my Android phone...

[Eric Rechlin]

(09-26-2018 09:53 PM)ijabbott Wrote:  

(09-26-2018 03:08 PM)Jlouis Wrote:  This remind me that I a need to dump the Rom from my 27s, a good task for the weekend.

I also need to attempt some ROM dumps sometime for both my HP-42S and my HP-27S, but I don't have a HP 48 to use to receive the ROM dumps. I do have a HP 50g though, and I wonder if that can be used to receive ROM dumps? I also have an Arduino based "Red Eye" to USB serial converter which I may be able to use to receive the ROM dumps straight from the HP-42S or HP-27S to the PC after a bit of experimentation.

The images in this page might be of interest to you. Don't ask questions; just think and experiment...

https://hp.giesselink.com/ImageArt/ImageArt.htm