fireflyst at earthlink.net
Tue Mar 28 11:40:17 CST 2006
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jay West
> Sent: Tuesday, March 28, 2006 11:17 AM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: 11/45 RTC
> Julian wrote...
> > How about this: Dig in the KW11-P manual if its available
> and see if
> > there is any info on replacing a KW11-L with it. Maybe
> that will tell
> > you where that LTC L signal is.
> Yes, but I'm missing something somewhere. I see the spot
> where the power supply LTC L signal hits the cpu backplane.
> It comes from the brown wire, #7 on P2 at the top front.
> There's a trace that goes down from this to slot 1, row C,
> pin R1. That's just peachy, and gives me a spot to test in
> order to make sure the power supply is providing a clock signal.
> But of course I want to make sure that signal is also present
> on the three unibus slots built into the cpu backplane, so
> that my DL11-W can use it. So I was looking for THAT pin.
> From eyeballing it and testing, it appears that slot 1 row C
> pin R1 (the LTC "source") hits all the unibus slots on the
> cpu backplane at row C pin D1. Ok, I'm fine there.
> But here's where the KW11-P manual gets confusing. I'm only
> bringing this up as a sanity check - It says that in order
> for the KW11-P to get the LTC (if you even want to use that
> option, not required), you have to install a jumper wire to
> the slot that the KW11-P is in to provide that signal. It
> says the KW11-P expects to get it on CE1, and specifically
> says to run a wire from CE1 to slot 1 row C pin R1 (on the
> 11/45). But why would they say that if the LTC signal is
> available on pin CD1 right there in the same slot already
> next to CE1?? Or better yet, why didn't they design the
> KW11-P to get LTC from CD1 instead of CE1? This is the part
> that makes me think I'm messing up somewhere.
Do you maybe have a different/special backplane alltogether? Is the
backplane designator sticker still on it?
> I guess I could find prints for the DL11-W and see if in fact
> it's looking to CD1 for LTC.
That sounds like a good idea too.
> Jay West
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