9 Mar
2000
9 Mar
'00
10:38 a.m.
--- CLASSICCMP(a)trailing-edge.com wrote:
John B. writes:
>I have a PDP-11/05... replace the RX01 system with
an RX211 and an RX02...
To get to *real* basics:
The RX11 is a programmed I/O device. The RX211 is (as usually used) a
DMA device. You'll probably have to remove the NPR continuity wire across
the slot when you put the RX211 in it, and ensure that this signal is
continuous up to that far too.
I doubt you are short of double-height grant cards, but I have a wad of
non-DEC ones because SRC used to ship our own with every Unibus COMBOARD.
Let me know if you're interested.
When I get my flatbed scanner back from loan, I'll add both of our designs
to the "field guide".
-ethan
=====
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The original webpage address is still going away. The
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See http://ohio.voyager.net/ for details.
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