I have CNC PCB drilling machine. The PC which was running the machine was connected to printer port. The other port (25 pin ) had a dongle (hardware lock) to recognise the authorisation. The data IO card is inserted on the motherboard. The machine runs on MSDOS versions only. If used with win 98 /dos it stops running.
Suddenly PC motherboard went bad. The other motherbord if replaced runs for sometime then machine hangs . Could we get possible reasons?