VERY predictable latency... 64 seconds to be exact

Over the past few months I have been converting an old CNC router project using TurboCNC to a much more sturdy Bridge Mill with EMC2.

I found an IBM T43 laptop with a built in parallel port that is working great... except for one small issue. Every 64 seconds my latency (as measured by the EMC2 Latency checking program) jumps from ~7500 to ~68,000. If I happen to be jogging an axis or two when that 64 second latency spike hits the axis stalls.

I have turned off every thing that I can think of in the BIOS just to see if it influenced the 64 second time interval but to no avail..

Any Ideas?

wiki.linuxcnc.org/cgi-bin/emcinfo.pl?FixingSMIIssues

It seems an SMI related problem

Thanks Acemi.. I'll try that tonight..

Can anyone offer any insight on the overheating issue?
Will my internal fan be disabled? Or just never come on?

Should I force air through the system externally ? Or just not worry about it?

Success!!

Latency never exceeded ~15,000 after an hour.

The fan seems to be running as normal. Not too fast.. not too slow. Just a moderate warm breeze wisping out of the heat exchanger.

Thanks for your help!