Don't think there's an easy answer for you. As you known this is all
based on 5v TTL. Your answer is likely to be chipset specific. Maybe
SIIG will tell you something. If your real lucky you may find a
datasheet for the IC on the board.
The Intel 8255 (big, old, and out of production today) is what IBM used
first so if you grap the data sheet from intel for that part it may give
you some help. I've noticed the newer boards offer some protection
logic for over current (it looks like anyway).
daniel sheltraw wrote:
> Hello Parport list
> If this question is not appropriate for this list would someone
> please tell where to get such help.
> I have a home built device connected to my SIIG ISA parallel port.
> The device uses pin 10 for a hardware interrupt and pins 2-5 for
> data input as well as the ground pins 18-25. Should the unused data port
> pins 6-9 be tied high?
> I have burnt two SIIG ISA cards with my circuit but the device
> works fine on a pcmcia Quatech parallel port.
> Thanks again,
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