22 Feb
2008
22 Feb
'08
1:05 a.m.
Tim Riker wrote:
An 'A'! .. even better. Found your photos again, see you've effectively fixed
the frame .. thank goodness for symmetry. I made schematics for 2116C power supply,
should be largely applicable to the A, at least to get an idea of the organisation,
if of any help.
The method I use at the moment is that I have a 12531
set to 2400 baud
in slot 11. I'm also using this as a console once I have hp basic or
similar running.
I'm running Linux so then I run stty thusly:
..
which sets raw, clearing everything else and setting
2400 8n2
..
The paper tape bootloader does not expect to talk to a
12531, but works
as the 12531 inits to a state where it'll read the bytes. ie: the
software interface looks the same.
Glad you figured out the paper tape BBL would work for the HST, I was
forgetting earlier that the byte-read interface was so similar.
I had a timing problem with the HST initially, it was resolved by sending 2
stop bits and now runs at 19200 bps. There's some explanation on:
http://www.cs.ubc.ca/~hilpert/e/HP21xx/io12531BCD.html
if you haven't seen it already. I take it you're using a 12531C (HST) if
you're
running at 2400. If you're already sending 2 stop bits though .. wonder if the
oscillator could have drifted far enough out to be a problem.
It's been interesting to hear about this IBL stuff added in the later machines.
Didn't you
have a 2116B with a broken aluminum frame, or was that someone else?
Yes to the frame, but it's a 2116A. I don't know anyone else with an A.
Mine is still having power supply issues, I've just not gotten back to
it. If anyone else has an HP-2116A, I wanna hear from you! Still looking
for Volume2 of the docs to cover the different core layout on this machine.