27 Jul
2009
27 Jul
'09
11:13 a.m.
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.
I've verified on the backplane that +5 sits at a steady +5.06VDC and -15
is at -14.86VDC. I do not possess an o-scope, so the best I can do is with
my multimeter.
I have two problems. The first is that I do not own a "proper" cable that
goes from the DL11-W to a terminal. I own a VT240 and have crafted a cable
that goes from the Berg connector on the DL11-W through a header to a DB9,
which connects to a DB25/DB9 expander on the back of the VT240.
Obviously I've verified the VT240 is in 300/8O1 as required. To go from
the flat-ribbon to the DB9 I have what used to be the header from a CDROM
drive and have soldered the RX/TX/GND lines on the DB9 direct to the pins
on this header. Currently it looks like this:
BERG DB9
B 5 GND
F 2 RX
J 3 TX
I -think- this is right, but I'm not positive. If I'm doing something
stupid, I'd sure love to have someone point it out.
I think there's one thing you've forgotten, but it would only affect
input from the terminal. And that's that you need a jumper wire on the
Berg connector to connect the output of the RS232 receiver (for the RxD
line) to the input of the UART (the reason for this jumper is that you
can fit a different jumper to connect the current loop circuit to the UART).
-tony