DEC bus transceivers (was Re: Unibus disk controller with modern storage)

[Noel Chiappa]

    > 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