Posts: 412
Threads: 40
Joined: Mar 2006
Actually, I don't know what E stands for, maybe English? Some business machines (like HP17BII) were available in two versions: english and international (with choice of language). But not the HP42S.
To get the ROM revision, do:
EXIT-LOG to enter the test mode,
<- to enter the memory browser,
'.' (decimal point)
You will see the ROM version at the left of the display.
There were 3 ROM versions: A, B, C.
Posts: 84
Threads: 10
Joined: Nov 2007
Well, from a physical standpoint, there are two versions, each with slightly different displays. One has a display with a metal surround that is almost flush with the glass. The other version has a screen that is almost recessed... the surround is raised compared to the screen itself. I'm told that the recessed version is rarer.
Todd