> Even more critical issues exist beyond the character of the
> controller.  QBus interface chips for the most part are obsolete.
> National still makes some devices, but these are very expensive.
> There are always discrete transistors, I guess......

I once participated in the building of a Qbus board out of discrete
logic.  For a simple board - and an IDE interface like yours counts as
"simple" for these purposes - this is by no means out of the question.

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