Posts: 301
Threads: 28
Joined: Jan 2005
I found somewhere the information to get ROM version:
Enter in "test" mode pressing ON and LOG together; then press <- (back arrow) to start the debugger; it will point to a routine that shows the ROM version on screen pressing the decimal point (execute, from the debug). Mine shows in the left "A" and in the right "5". To exit press ON together with SQRT (square root).
Regards,
Nelson
Posts: 355
Threads: 67
Joined: Nov 2005
For the HP42S the ROM Rev. A, B and C are existing.
In the version screen the character on top left side is the version, the number on top right seem to be the reason of last calculator restart.
On the emulators all three ROM versions have the COMP bug, because this is hardware dependent. Early HP42S with ROM rev. A use an older revision of the 1LR2 Lewis chipset with a bug inside that the COMP bug don't occur. I personally have a late HP42S with ROM rev. A SerNo. 3017Sxxxxx _with_ the COMP bug.
IMHO use the latest Rev. C ROM, the version I use for the Emu42 development.
Christoph