DEC bus transceivers (was Re: Unibus disk controller with modern storage) - test-drb@ccmp.vtda.org

24 Oct 2016

...
  From: David Bridgham 
...
  Just the bus interface takes over half the area of a
dual-height board! 
In part because the level converters are SMD, and we had to mount them on
(modified) wide DIP carriers to use them in a wire-wrap board.
...
  I've played around with laying out what might be
the production board
 ... and I've got it down to a row of 8641 bus transceivers and a row or
 two of the level-converter chips. 
...
  http://pdp10.froghouse.org/qsic/proto-pcb.jpg 
For those looking at that picture, it's not our current plan for 'producton'
QSIC's; the one in the picture uses a daughter-card with an FPGA on it, but
that makes the card to high to fit into a single slot. So the current plan is
to do a card with an FPGA on it directly.
        Noel