Emco Tool Turret

I'd want to be able to use this in conjunction with CNCPro, for
example, so that means an M-code which would drive some hardware
and which would imply a "wait" for an appropriate time. Given
that there's not likely an "I'm ready to go again" signal detection
capability in cncpro, I'm hoping there's an M-code that would do.

There would have to be some manually confirmed initialization
for new running programs, and attention to details on loops and
subroutines.

I don't see the point in stepperizing it, just use a signal from
the parallel port to drive the turret through "n" increments
(i.e., "n" tool positions) as they appear in your program, and at
the end of each cycle, the hardware backs the turret up to hold
it in position. If there isn't an M code that implies a time
delay, send a g1 line to an axis that isn't currently ON, with
the feedrate suitable for the delay desired. Assuming we start
at a "0" position, and it takes the turret 1 second to move to the
next position, and the chosen axis has a feed rate of 1 inch/second,
send it a G01 A0.5
G01 A0

for each increment. It's up to the coder to keep track. At least that
is what *I* plan to do with mine.... /mark