5 Aug
2007
5 Aug
'07
3:13 a.m.
Chuck Guzis said:
I've also got an ancient Taiwanese one that works
only with a PC XT
that will handle 2708s.
From modern point of view (ok with classic cmp fans I
am on thin ice :-) )
it does not make sense any more to user the three voltage
EPROMs. Not only
that they require quite a different programming method, the three supply
voltages need to be applied in correct order (namely GND/-5V first, then
+5, finally +12) otherwise they can easily be fried. Managed this more
than once in the past, result was to rewire the circuit to use the less
sensitive 2716s instead.
--
Holger