Trying to get my RLV11 working
bqt at update.uu.se
Thu Oct 29 13:22:25 CDT 2015
On 2015-10-29 18:44, Noel Chiappa wrote:
> > From: Ben Sinclair
> > the bc80m cable .. which I believe is a ribbon type of connector with a
> > ground strap on one end, then a round cable to the berg connector for
> > the back of the RL02. I think it's the cable pictured here:
> > http://www.cosam.org/computers/dec/pdp11-23/20080403.html
> Yes, that's the cable. But there's no ribbon cable anywhere in it: the
> individual wires from the round cable go directly to the Berg (aka Du Pont)
> female connector, which plugs into the male Berg header on the board.
> The other end does not have a Berg connector, it's some sort of wierd-ass
> connector that I don't know the proper name for. (The RK0 also uses them,
> and I think maybe the MASSBUS too?)
The Massbus connector is similar, but about three times the size.
> > Early revisions only supported 18 bit addressing, but later models
> > supported 22 bit addressing. But how that is reflected in the micro-ODT
> > on a KDF-11 I don't know.
> I already bitched about this! Although it supports Q22 _on the bus_, their
> ODT only supports Q18. There's no way to fiddle with high memory, except
> via program!
> > I don't even know if it's actually micro-ODT, or some more primitive
> > console mode on that CPU.
> AFAIK, it's the same ODT as all the other QBUS -11's (03, 73, etc - although
> the /03 has the 'L' bootloader command that none of the others do, along with
> a couple of other odd minor ones like '@').
I certainly seem to remember that some machines had a rather different
interface than the Micro-ODT one, but maybe they were all various early
Unibus-machines. Can't remember for sure. I tried to stay away from
machines that had the serial console interface to the hardware. I prefer
front panels. :-)
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
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