29 Oct
2015
29 Oct
'15
10:44 a.m.
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[67] also uses them,
and I think maybe the MASSBUS too?)
The RLV11 and RLV12 seem hard to find, at least on
eBay
They come by occasionally. I can probably find an RLV12 for you if you
want/need one.
so fixing this one might be the way to go!
Fixing an RLV11 is not for hardware beginners. Think logic analyzer, at
least.
From: Johnny Billquist
I would primarily expect 16 bits addresses to be used
on a KDF-11, but
I could be wrong.
11/23 ODT addresses are always 18-bit (whether the MMU chip is installed or
not); I don't know if attempting to look at memory above 56KB works without
the MMU, though.
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 '@').
Noel
29 Oct
29 Oct
11:22 a.m.
On 2015-10-29 18:44, Noel Chiappa wrote:
The Massbus connector is similar, but about three times the size.
Yuk. :-)
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
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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[67] also uses them,
and I think maybe the MASSBUS too?) 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 '@').
3342
days inactive
3342
days old
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