19 Oct
2016
19 Oct
'16
8:49 a.m.
From: Rich Alderson
Yes, the d/r card is strictly level conversion, and
the microcode in
the Xilinx does all the Massbus protocol.
So if you don't mind continuing to indulge my curiousity (thanks for all the
indulgence so far :-), is the D/R card a daughtercard that mounts on the Mesa
(my guess)?
Noel
19 Oct
19 Oct
11:22 a.m.
From: Noel Chiappa
Sent: Wednesday, October 19, 2016 8:49 AM
> From: Rich Alderson
> Yes, the d/r card is strictly level conversion,
and the microcode in
> the Xilinx does all the Massbus protocol.
So if you don't mind continuing to indulge my
curiousity (thanks for all
the indulgence so far :-), is the D/R card a daughtercard that mounts on
the Mesa (my guess)?
Actually, due to the board real estate required for all those transceiver
chips, we couldn't make it all fit on a card that fit inside a PC. There
is a separate box with the Massbus connector on one side and ribbon cables
going to the server on the other.
Rich
Rich Alderson
Vintage Computing Sr. Systems Engineer
Living Computer Museum
2245 1st Avenue S
Seattle, WA 98134
mailto:RichA at LivingComputerMuseum.org
http://www.LivingComputerMuseum.org/
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