19 Sep
2002
19 Sep
'02
4:09 p.m.
Hmmm...I never noticed that...
No, I don't see any reason to have done this, except
possibly to deliberately make it incompatible with the
"standard" lower case 2513 (I'm fairly certain that
there was one, Jameco used to sell it), so that they
could get a premium price for their part. Imagine the
suprise of someone plugging one of these chips in in
1978 or so, to see the characters jumbled up!Because I
made a copy of it without analyzing it, no problem. No
brains, no headaches.
Of course, one could make it compatible with a little
board the size of the one I made and flip the address
lines around, or cut up and jumper the PCB, but who
would want to start cutting up their $1000 terminal
for a relatively small savings? And remember, of
course, UVEPROMS were very expensive them and very few
people had programmers at their disposal.
So, that's the best I can come up with.
one unusual thing
about this is that all of the address lines into the
lower case
character generator are inverted."
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