13 Nov
2013
13 Nov
'13
3:54 p.m.
Hi Christian,
I found a copy of the Maintenance Manual. According to page 4-8 to
check an Undefinable Halt Code you should have a x'FFFF' in R7L0. on
my display I see
x'0E0F'. The manual doesn't say what the cause of that might be. I did
check and according to the manual, I have the cards in the correct
slots. I can send you a picture of the register display if you'd like.
Ellis
On Wed, Nov 13, 2013 at 5:59 AM, Christian Corti
<cc at informatik.uni-stuttgart.de> wrote:
On Mon, 11 Nov 2013, Ellis Holman wrote:
Rectangular blocks. When I switch to a register display I get readable
characters, so I made an assumption (maybe incorrectly) that the
graphics adapter is functioning. How can I validate that the correct
Well yes, I also guess that the graphics adapter is functional. But what
characters do you see in register display mode?
cards are in the correct slots? This machine has
passed through
multiple hands before me and there's no guarantee
that the cards are in the correct slots, or even if the correct cards
are present.
That's obvious. See the MIM[1] section 209 (A1 board). And BTW, please also
check the voltages and check if all connectors are properly seated
(especially those around the side of the backplane). For example, the
storage needs +8.5V and -5V. Those details are described in the MIM.
See also the bring up chart on page 4-7 of the MIM.
Christian
[1] IBM 5110 Computer Maintenance Information Manual