27 Mar
2006
27 Mar
'06
10:10 p.m.
For what's it worth ... I do not have an 11/45 :-(, but I
was triggered when I read M787. Long ago, I added "LTC" to
my 11/35, which involved installing an M787 in slot 3,
position F. The 11/35 manual said that you must cut one
wire on the backplane ... perhaps that applies here too ...?
- Henk.
-----Original Message-----
From: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jay West
Sent: dinsdag 28 maart 2006 7:32
To: General Discussion: On-Topic and Off-Topic Posts
Subject: 11/45 RTC
Given that the system seems to pass a lot of diags, but fails
the LTC test, I'm focusing there. From looking in the
programming manual for the DL11-W, it appears that bit 7
never being set means that there is no LTC L signal coming in
to the DL11-W. It would appear that software clears this bit
and then waits for it to set (by the square wave from the AC
at 50 or 60 hz or so). According to the diag, bit 7 never
sets, so I'm thinking I'm not getting any LTC signal from the
power supply. I need to find that square wave signal and see
if it's working and directed to the right place.
My problem is finding that signal. My 11/45 is a KB11-A,
serial number < 2000. The maintenance manual shows the LTC
coming from the power supply to the power distribution board
(top connector towards the cabinet door) shows six wires, the
bottom one (brown) going to slot 1 row C where the M787
option plugs in. My top connector does not have that many
wires, only 3 or so. My system never had (I don't believe) a
M787 card. The system came with two DL11-A (M7800), and a
M7228 (KW11-P). But I don't think there was ever a LTC in
slot 1. So is it possible that LTC isn't even routed out of
the power supply? I'm wanting to use a single DL11-W with the
onboard LTC. But doesn't that need to get the LTC signal from
the backplane? If it wasn't ever routed to the system unit....
So I'm not sure where to look. I'll pour over the manuals some more.
Jay West
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