HP-27S ROM image dumpRef. http://hp.giesselink.com/
Thanks to Christoph Gießelink for sharing the required information.
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.