24 Feb
1998
24 Feb
'98
2:36 p.m.
allisonp(a)world.std.com (Allison J Parent) wrote:
[....] IO however while it would be nice to
interogate or write to devices could leave the cpu "out of sync" since
all IO is done from the accumulator.
You say that like there's something wrong with it.
Well, there could be, I suppose, if your hardware is such that reading
its registers changes them, and the operator doesn't realize this.
Was the latter really considered a problem in those days? Or was it
just that as a result it wasn't real useful to have the front panel do
that? (Or was it just the additional cost of having the front panel
do that?)
-Frank McConnell