Well . . . what could possibly be more
"open" than the ISA. It's capable of
pretty much anything that the PDP-11 could dish out, AND you can get paid
for taking the boards away from a lot of places. Almost any function you
care to have is available if you don't want to try to improve on what's
available, and the structural components are commonly available. The same
could, I guess, be said of the VME in the smaller form factors. In all my
years of hardware scrounging, I've never seen any architecture more prolific
than the ISA, and in that time I've seen maybe a half dozen Q-bus cards for
cheap. Now, I'm not saying it has be cheap, but you would gather that as
the primary requirement from what most folks seem so spout about in this
forum, e.g. "What??! A dollar for a 1956 Rolls, in solid gold! Too much!
I'll offer a nickel . . ."
Dick
The problem with ISA is lack of interrupt sharing on most boards.
Perhaps if a passive backplane was used and the isa boards were
modified to allow interrupt sharing.
The limited number of IRQ's is a major drag.
The cases and power supplies are cheap, though.
I'd recommend going with VME or Multibus over ISA.
Bill