Re: HP 42S ROM-versions Message #5 Posted by Christoph Giesselink on 24 July 2003, 12:06 p.m., in response to message #1 by Harry (Germany)
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
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