5 Apr
2007
5 Apr
'07
9:17 p.m.
Is this online anywhere to anyone's knowledge? I assume it's in the techrefs
It is. It's in Volume 2 of the Options and Adapters Techref at least (I
have it).
[1] (which I don't have, unfortunately), but
I'm sure I've seen the schematic
online somewhere in the last few years.
IIRC it's only a handful of latches, buffers and address decoding - so not a
complex bit of hardware.
Yes, just a few TTL chips, nothing really clever at all.
[1] The circuit on the MDA card is probably the same... if someone could
confirm that then I could at least trace it from a real MDA card here :)
There are minor differences, mainly due to the fact that the MDA card's
printer port is at a different address (you can have the MDA card _and_ 2
printer adapters in the same machine).
Are you in England at the moment? If so, I could probably be convinced to
snail-mail you a copy of the page from the Techref.
-tony