25 Jun
2005
25 Jun
'05
4:49 p.m.
> What programmer can I look for that has the
ability to program a
> 2708?
I have a Softy 2 that can do it if you're really stuck.
Not just that, the programming algorithm is different
to most
other EPROMs. IIRC you have to program all locations in sequence,
giving each one a 1ms (IIRC) programming pulse, and repeat that
50 times.
Any bit in any byte can be individually programmed from 1 to 0.
There are no sequence requirements, the programming pulse is one
pulse of 50ms per location programmed.
You can't program odd locations like you can in
later EPROMs.
You can, it's EPROM microcontrollers like the 68705 that need to
be programmed in sequence.
Lee.
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