20 Jan
2005
20 Jan
'05
4:47 p.m.
So, now that I've got a pair of HP 21MX machines sitting here (thanks
Jay!), I could use something to toggle into them to test out the memory,
or do "nifty things" with the frontpanel lights.
I guess I could try spend some time learning HP assembly and coming up
with things myself, but it'd be nice to have some examples to look at
first. :)
Pat
--
Purdue University ITAP/RCS --- http://www.itap.purdue.edu/rcs/
The Computer Refuge --- http://computer-refuge.org
21 Jan
21 Jan
3:16 a.m.
Patrick wrote...
So, now that I've got a pair of HP 21MX machines
sitting here (thanks
Jay!), I could use something to toggle into them to test out the memory,
or do "nifty things" with the frontpanel lights.
Memory has already been
thoroughly tested in those machines with HP diags :)
There's a few toggle-in programs in the CE handbook. I believe it's in the
"common data" section just before the diagnostics. Let me know if you can't
find them (on bitsavers).
I guess I could try spend some time learning HP
assembly and coming up
with things myself, but it'd be nice to have some examples to look at
first. :)
Another budding HP'er :)
Jay
23 Jan
23 Jan
10:30 a.m.
Jay West declared on Friday 21 January 2005 12:16 pm:
Patrick wrote...
The next question: is there some sort of 'user guide' that shows how to
operate the frontpanel to deposit/examine values in memory, etc? I've
figured out how to get the program counter, and step through
instructions (and the run/halt switch), but don't really know what the
other registers/stuff is.
Thanks. :)
Pat
--
Purdue University ITAP/RCS --- http://www.itap.purdue.edu/rcs/
The Computer Refuge --- http://computer-refuge.org
So, now that I've got a pair of HP 21MX
machines sitting here
(thanks Jay!), I could use something to toggle into them to test out
the memory, or do "nifty things" with the frontpanel lights.
Memory has already been thoroughly tested in those machines with HP
diags :)
There's a few toggle-in programs in the CE handbook. I believe it's in
the "common data" section just before the diagnostics. Let me know if
you can't find them (on bitsavers).
2:11 p.m.
The next question: is there some sort of 'user
guide' that shows how to
operate the frontpanel to deposit/examine values in memory, etc? I've
figured out how to get the program counter, and step through
instructions (and the run/halt switch), but don't really know what the
other registers/stuff is.
I can't believe the 21MX M or E user guide isn't online, but I don't see it
anywhere. You'll definitely need that book!
A = General purpose register A (also hardwired to location 0)
B = General purpose register B (also hardwired to location 1)
P = Program Counter
M = Memory register (points to whatever memory location is currently being
accessed)
T = Target register (contains the contents of whatever location is pointed
to by M)
S = S register (display register) the front panel lights :) Accessible as a
device as well
So to put a halt into location 100... select M register, enter 100, hit
store, select T register, enter 102077, hit store.
One handy tidbit... if you have the T register selected and hit store, the M
register is automatically incremented by one for you.
To execute the halt instruction, select P register, enter 100, hit store,
preset, and run. You should get a 102077 halt.
Now on the 2100 front panel, you don't have to hit store at all. There's no
store button :)
Jay
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