Introduction and need help bringing some pdp11's back
pete at dunnington.plus.com
Tue Oct 29 13:13:57 CDT 2019
On 29/10/2019 16:28, Chris Zach via cctalk wrote:
> The real problem is I'm trying to put an RQDX3 in there instead of the
> ESDI controller so I can boot off RX50's. And I have no idea which way
> all the various ribbon cables are supposed to go. Will any 50 pin cable
> work between the RQDX3 and the BA23 distribution bulkhead? Anything
> special about the 34ish pin cable that goes between the bulkhead and the
> RX50? So far when I try to boot all devices DU0-3 give me not yet ready.
No, there's nothing special about either the 50-way ribbon cable or the
34-way ribbon cable. Just don't use a PC-style floppy cable with a
twist in it. DEC did it the way God (and Alan Shugart) intended. But
which distribution bulkhead have you got? I assume not an M9058,
because that's a card with lots of options that goes in a Q-bus
backplane and wants jumpers setting.
Either way, you might find this file helpful if you want to work out
what's going where:
and maybe even a glance at this one:
because it shows the relationship between the connectors and the signals
a bit better.
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