-----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... and see if that will tell 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.

I guess I could find prints for the DL11-W and see if in fact it's looking to CD1 for LTC.

Jay West