Re: [CAD_CAM_EDM_DRO] port configuration help req.

In a message dated 08-Oct-00 19:22:11 Central Daylight Time,
hexagon@... writes:

<< I have been using an old 386 for a project and last week I picked up
another that had been left out for the garbage. I connected the
computer up and it booted ok and I installed my software (maxpro). I
connected up my controller and strange things started to happen! The
x axis works ok but I have no y axis yet when I jog the z axis both
the z and y move. Changing back to the previous computer all was well
again.
Any ideas please?
Thanks, T. Ackland >>

Don't take this wrong: "You found it where? Why do you suppose it was
THERE?" I am NOT a puter-expert, but it would be my guess the '374 LPT-1
driver-chip is defective. I have READ, somewhere, that the older PC's used
the 374 to drive the data-port at $378 (888 decimal). So, an "educated
guess".

If that is socketed, you can simply VERY-CAREFULLY unplug the "old" IC and
stuff in a new one, being very newbie-careful not to nupper the leads! It
needs all-20 to work!

If you have a "Logic Probe", and just subbing the '374 (or whatever is used
in YOURS, to drive the "DATA PORT" of the LPT-1, pins #2-#9 of the DB-25
printer-port cable connector) does nothing new, you could probe the "incoming
data-stream" to that IC, to see if the trubble is further "up-stream", in
which case I can only say, "Lotsa luck!"

JRR