25 Jun
2005
25 Jun
'05
2:24 p.m.
I have a DataI/O model 19 and I think I have a 2708 plug-in for it. The
reason that most programmers don't support the 2708 is because it requires
three voltages to operate. Come to think of it, I have a couple of old
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. You can't
program odd locations like you can in later EPROMs.
FWIW, I thiok the 3rd party progammer I have for the Nascom does 2708s.
And I haev at least one plug-in card for the Apple ][ that claims to
program them. And a stnad-alone programmer controlled by an SC/MP that
does just about everything from 2704s to 2732s.
-tony