I was bored and found a HP-27S

[jebem]

(06-27-2014 11:12 PM)Dave Frederickson Wrote:  According to this post this capability has been around for 10 years. Please let me know if you get around to trying it.

Dave

Job done!

I have now my own copy of the HP-27S ROM image dumped from my physical calculator s/n: 3122S04492.

I spent this Saturday's morning collecting and organizing the required information from the Christoph Giesselink site.
Then I had to make a RS232 serial cable to connect the man-in-the-midle HP-48G+ to my PC.
Only then I did the ROM transfer.

I have to say that this is no challenge at all. Easy job in fact. Worked at first try.
Thanks to Christoph Giesselink and others work!


ROM transfer via IR from HP-27S to HP-48G+




Transfer finished. The HP-27S did a warm boot. The HP-48G+ showing the new string.




Transferring the ROM to a PC using XModem protocol. Windows 7 64-bit running Hyperterminal.




Striping the extra data from the ROM file at PC.




ROM file checksum OK.




Testing on the excellent Christoph Gießelink's Emu42 running the HP-27S ROM image.