27 Jul
2009
27 Jul
'09
4:15 p.m.
On Mon, 27 Jul 2009, Tony Duell wrote:
Weeeeeeell... I'm not sure if I've just broken it for the better or for
the worse, but it's definitely doing something different.
This is the sequence of events (with power offs in between, of course)
- I removed the M9302 and powered the unit up, RUN light on, immediately
off, as usual.
- I removed the M9202 that bridges the short bus to the long bus. No
change.
I noticed that one of the boards I removed, the X031, has a regulator on
it (it has -15VDC silkscreened on it, not that that helps), and although I
suspected it must be needed for the other X* cards, I thought I'd drop it
in and see.
- With the X031 in, the M9202 in, but the M9302 out, I power on - the RUN
light comes on and STAYS on. But flicking the BOOT/INIT switch does not
make it go out at all, which I _think_ it's supposed to do. Flicking
HALT/CONT also does not make the light go out. Great. Now I've hosed it.
- I remove the X031, power on. Same (RUN light stuck on)
- I put the M9302 in, same again.
- I remove the M9202, and what do you know, back to the RUN light going
off and staying off, except wheen BOOT/INIT is toggled, and then it flicks
out again.
If I put the M9202 in and bridge the busses (without any boards in the
'big bus') the RUN light stays on. Remove the M9202, it's off and won't
go
on except momentarily when the BOOT/INIT is toggled.
I see nothing on the console, although I'm still vaguely suspect I've
gotten something wrong (about how long should I expect to wait before
the $ should pop up?).
Boy, I'd love to know what it sounds like to you folks. I appreciate all
of the suggestions I've received, onlist and off, thanks to all for your
help.
- JP
I've got
the DL11-W set up in the same manner as the 300bps example in the
11/34 Users Manual (and the DL11-W Operators Manual), and at this time I
have the three X* cards as well as the M7843 card removed as I don't
believe they're required for boot.
With na M9302 terminator at the end of the Unibus (as you have), that's
going to cause problems. Basically, there are 5 signals known as 'grants'
that are not bussed, they are passed from one card to the next along the
backplane. If there's a gap (as there will be with cards removed),
there's soem logic on the terminator that gets confuesed, and hangs the
entire machine.
I can give you a lot more details if you want it. To start with, though,
youshould be able to run a short Unibus like that with no termintor at
the far end -- just pul lthe M9302 card as well.