#: 15645 S15/Hot Topics
    23-Jun-92  09:20:02
Sb: #15642-#6309 & /t2
Fm: Pete Lyall 76703,4230
To: BOB LEET 72020,2536 (X)

Bob -

Locking up after a period is an indication of overheating (or mismatched speed
rating). I used to have some EPROMS that acted like that... fine for 20 minutes
or so, then wham.

I'm not sure what the 4in1 uses for serial port chips (Steve Wegert may), but
you may want to verify that their 6551's are rated for proper speed a
coco3/1.87MHZ clocking. Also, are you using an IRQ hack line for your
interrupts? If not, this may buy you some solidity... see IRQHAK.TXT in
DL(1?)...

Pete

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