17 Nov
2014
17 Nov
'14
7:55 p.m.
From: Ben Sinclair
I did not have a jumper on W4, so I added one
Err, adding jumper W4 _disables_ the LTC interrupt; see pg. 324-325 of the
"Microcomputers and Memories Handbook (1982)". (Since you were apparently
seeing LTC interrupts before, it makes sense that the prior state of the
board had them enabled...) If you don't have that book, worth picking one up
on eBay - full of all sorts of useful info.
The test I can't run .. is the JKDBDO CPU test.
When I try to run this
one it doesn't print anything and drops me to ODT at 037526.
Hmm. Probably need listings, or something, to figure out what it's unhappy
about. The only documentation I could find online is the "PDP-11 Diagnostic
Handbook", and various copies of the content there, and it's not very
detailed. (BTW, it's probably 'JKDBD0', not "JKDBDO".)
The BDV11 manual says they are controlled through a
register via
software, so maybe I'm just not running anything that sets them.
That would be my guess too.
The only boot rom I have on the BDV11 is a TU58 boot
loader, so if it's
up to some other boot rom to set that LED register
More likely the system software, not the ROM.
Noel
17 Nov
17 Nov
8:38 p.m.
Now I'm confused again! If I setup the BDV11 to control the LTC interrupt,
should I have W4 in or out?
This information on the JKDBD0 test says it will halt and store information
in memory, and to refer to the microfiche to find out what happened.
However, it also says it will print that banner message, but I don't see
that. I believe it's not even starting the test, but I'm not 100% sure.
On Mon, Nov 17, 2014 at 1:55 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
wrote:
--
Ben Sinclair
ben at bensinclair.com
From: Ben
Sinclair
I did not have a jumper on W4, so I added one
Err, adding jumper W4 _disables_ the LTC interrupt; see pg. 324-325 of the
"Microcomputers and Memories Handbook (1982)". (Since you were apparently
seeing LTC interrupts before, it makes sense that the prior state of the
board had them enabled...) If you don't have that book, worth picking one
up
on eBay - full of all sorts of useful info.
The test I can't run .. is the JKDBDO CPU
test. When I try to run
this
one it doesn't print anything and drops me to
ODT at 037526.
Hmm. Probably need listings, or something, to figure out what it's unhappy
about. The only documentation I could find online is the "PDP-11 Diagnostic
Handbook", and various copies of the content there, and it's not very
detailed. (BTW, it's probably 'JKDBD0', not "JKDBDO".)
The BDV11 manual says they are controlled through
a register via
software, so maybe I'm just not running anything that sets them.
That would be my guess too.
The only boot rom I have on the BDV11 is a TU58
boot loader, so if
it's
up to some other boot rom to set that LED
register
More likely the system software, not the ROM.
Noel
8:47 p.m.
On Nov 17, 2014 12:38 PM, "Ben Sinclair" <bensinc at gmail.com> wrote:
Now I'm confused again! If I setup the BDV11 to control the LTC interrupt,
should I have W4 in or out?
Yeah, I think I was confused about that. I think you would normally have
the BDV11 configured so that the BEVENT bus signal is under software
control so that you don't need to use the front panel Aux switch to disable
BEVENT. But you would normally always have W4 removed on the M8186 so that
interrupts occur when BEVENT is enabled on the bus. The exception would be
if you had something like an M8016 KPV11 which generates its own LTC
interrupts.
8:52 p.m.
Thanks! I'll pull the jumper from W4 and leave the rest the way it is. I
believe with that it will be under software control.
On Mon, Nov 17, 2014 at 2:47 PM, Glen Slick <glen.slick at gmail.com> wrote:
On Nov 17, 2014 12:38 PM, "Ben Sinclair"
<bensinc at gmail.com> wrote:
--
Ben Sinclair
ben at bensinclair.com
Now I'm confused again! If I setup the BDV11 to control the LTC
interrupt,
should I have W4 in or out?
Yeah, I think I was confused about that. I think you would normally have
the BDV11 configured so that the BEVENT bus signal is under software
control so that you don't need to use the front panel Aux switch to disable
BEVENT. But you would normally always have W4 removed on the M8186 so that
interrupts occur when BEVENT is enabled on the bus. The exception would be
if you had something like an M8016 KPV11 which generates its own LTC
interrupts.
3694
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