Re: Some Vintage HP15Cs Faster than Others? Message #3 Posted by uhmgawa on 4 Feb 2012, 12:06 a.m., in response to message #2 by uhmgawa
Quote:
..I've never come across more that one version of hp released firmware for the 15c.
But I have come across an apparent oddity which may relate
to a firmware version change.
I had loan of a 10c for the purpose of testing KEMU with
that model's firmware. When the 10c was running I would
get jibberish on the display but the system test would
succeed and render all available segments. It took me
a while to realize the display mapping was different than
every other voyager I've encountered.
This was a 22xx serial number 10c which has the early
satellite PCB containing the NUT and display controller.
However I have 23xx voyagers with the same satellite
PCB configuration, and firmware captured from them treats
the display mapping identical to the later single PCB voyagers.
So I'm unsure whether the display mapping difference here
is a function of the 10c, s/n <= 22xx voyagers, or possibly both.
The sequence of segments enabled during the keypad test for
both cases differs although the data written to the display
registers is identical. This makes for a simple check to
determine what units have this configuration, just by the first
set of segments enabled when the keypad ON + <div> test is
selected. The corresponding sequences are
here although the first display rendered in the
sequence is all which is needed. I've only ever encountered
the "A" version up until the "B" version generated by this 10c.
Would someone with a 22xx serial number voyager other than a
10c mind telling me what sequence is followed? Also if
someone has access to a 22xx < s/n 10c I'd be interested to
know how that behaves as well.
Thanks!
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