Let me get my computer specs,
Celery 366 (66mhz bus)
Intel 440BX chipset/Abit BM6 MB
RAM, Hard drive, video cards, etc, is all irrelevant. I could imagine the only thing that might matter is the chipset, but probably not.

I've got Award BIOS 4.51PG,
the important things, under Integrated Perhiperhals,
Onboard parallel port is x378/IRQ7, EPP Mode 1.9,

Then under Chipset Features, There is a setting "8-bit I/O Recovery Time"
I had to screw around with this until I got it to work. Right now its set at 7, but it will probably vary with bus speed and CPU speed.

Oh, another thing that is really weird. It doesn't work on this one FDS RAM adapter I have. It loads and brings up the "Nintendo Family Computer" screen, then just black screens, with no error messages. I suspect that the RAM Adapter might be bad, (bad DRAM maybe?), but the only way to test that would be to swap that chip with the other in my working RAM cart, I'm not ready to do that yet, maybe another day.

Loopy, what BIOS do you have?

I might give my Athlon another try later. I suspect if your BIOS isn't Award, it may have issues. I've noticed that a lot of parallel port devices are very BIOS dependent.