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General Mach Discussion / Driver test failed: APIC seems to fail

« on: May 18, 2011, 05:47:10 AM »

I've installed Mach3 on my P4 XP system. I did a clean install, removed all junk (but did install all drivers off course), disabled power management in any way I could (including in the BIOS), so I thought: Mach3 should run flawlessly now. but it doesn't. When I run the drivertest, at first glance it seems to be working perfect, a clean line, 24700 pulses/second or so, but after 1 or 2 seconds the pulses/sec goes down to 96 and it doesn't go up again. when I choose a different kernel speed it goed back up, stays there for 1 or 2 seconds, and goes down again.
what I've tried so far:
- install the special driver (no difference)
- installed an older version of mach (no difference)
- tested every LPT port setting available in BIOS (no effect)

if I recall correctily, the best port setting for mach3 is EPP with interrupt.
one thing I did notice however is that in the drivertest,  the APIC timing constant is always 0, and so is the box 'interrupt used'. it seems to me that that isn't good.

does anyone have any idea how to get this working?