At 08:17 pm 19/08/2001 -0500, Raymond C. Bryan wrote:
>A couple things if you have a volt meter test the power supplie
>voltages then see that the cpu has a "clock" pulse (on the 6502 is
>that on pin2 like the 6510?, look this up) a voltmeter should show
>about 2.5 volts on the clock pin (50% duty cycle of 5 V).
Good idea. I'm getting 2.1v from CLK0 (pin 37), 0.95v from CLK2 (pin 39)
and 0.75v from CLK1 (pin 3).
>
>Next if you have a working 8032 putting a dead chip in that will not
>fry the working unit, but that will tell you that have a working or
>dead chip (cpu, rom,via). Second the RAM is also a possible problem
>- but probably not socketed. Or you could have faulty logic ics
>74lsxx again not socketed.
I shall try the 6502 in my working machine (I've not checked that yet), but
I'm starting to suspect the CRT controller, as it's the warmest chip of
them all after a few minutes powered up.
Cheers!
Ade.
--
B-Racing: B where it's at :-)
http://www.b-racing.co.uk
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