RLV11/RL02 ->11/73?

From: Jerome Fine <jhfine_at_idirect.com>
Date: Sat Apr 3 14:58:45 1999

>CLASSICCMP_at_trailing-edge.com wrote:

> > In a box (from Dave, IIRC) I have found (3) three RLV11 cardsets,
> >the printsets for same, and the printsets and drawings for the RL01
> >and 02. This is kinda like going thru the pockets of an old coat
> >... I know that Zane has successfully attached RL02s to his 11/73, and
> >I wanna do that, too...
> You're fine, as long as your 11/73 has less than 248 kbytes in it.
> The RLV11 won't DMA any higher than 18-bits; if you've got 256kbytes
> or more of RAM, you want a RLV21.

Jerome Fine replies:

The last time (I only EVER did it once) I put the dual board RLV11
board set into an ABAB (Q22) backplane, I destroyed the boards.
As Tim Shoppa states, they MUST go into two slots which are
both ABCD. In a BA23 box, the top 3 slots are ABCD. I presume
that if you put the CPU in the top slot and the RLV11 in the 2nd and
third slot, it might work. Has anyone ever done that successfully?
Also, if you are running RT-11, you can still use more than 256 KBytes
in the system, just don't try to do it with the RLV11. PIP can
copy anything from the RL02s to the RD53 and then let you use
the rest of the memory over 256 KBytes.

> > The 11/73 has an RQDX2 and one RX02 8"... tell me how much more
> >info to provide and I'll do that. I'm going to try to install the
> >boards, but the little backplane is stuffed and I need to re-arrange
> >some things.

What backplane are you using? Most BA-11 backplanes are ABCD with
9 slots including a terminator board which MUST be the last slot you use
and is usually the last physical slot since bus grants are not a problem
with regard to termination. The ABCD slots are quad width and accept
dual boards as well, but the other half MUST stay empty.

The RX02 requires a dual M8029 (I think it is called an RXV12) with
a 40 pin cable.

The RQDX2 allows RD51, RD52, RD53. It is a quad board (a -YB).
Most will not accept an RD52 from an RQDX1 without re-format.

If your backplane is stuffed, what else do you have?

Sincerely yours,

Jerome Fine
Received on Sat Apr 03 1999 - 14:58:45 BST

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