29 Nov
2016
29 Nov
'16
9:50 a.m.
From: William Degnan
hit LOAD ADDR
address light 16 comes on, RUN/PROC/BUS/CONSOLE lights stay on.
According to the KD11-A manual (pg. 3-2) the address lights on the console
are driven directly from the CPU's Bus Address Register. So you've got an
issue there.
If I hit START light 16 turns off.
So it's not wedged on in the CPU. Maybe a console switch issue, then?
From: Josh Dersch
Try depositing a known word into a specific memory
address, like 1000
using the console PROM, then try reading it back with the front panel.
The console emulator doesn't directly support access to memory about 56KB (as
would be, with address bit 16 on). To look at that memory, one has to set up
the MMU and turn on mapping - there's a section in the M9312 manual which
shows how to do it.
Noel
29 Nov
29 Nov
10:10 a.m.
On Tue, Nov 29, 2016 at 12:50 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
wrote:
Thanks for finding that for me.
A DC LO has crept up, I can't take this any further until I fix that
issue. Not sure if it's the M7231 or a power supply component yet. I am
about ready to throw this thing out the window :-) .... if it would fit.
The problem with address 16 may have been related to the failure that
ultimately lead to the DC LO (-0.22 V) value. It wasn't an issue until
yesterday afternoon.
b
From: William
Degnan
hit LOAD ADDR
address light 16 comes on, RUN/PROC/BUS/CONSOLE lights stay on.
According to the KD11-A manual (pg. 3-2) the address lights on the console
are driven directly from the CPU's Bus Address Register. So you've got an
issue there.
If I hit START light 16 turns off.
So it's not wedged on in the CPU. Maybe a console switch issue, then?
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