Picked up this critter yesterday, it's a short (~7") 8-bit ISA card made by
ATD (which the FCC sticker tells me is Advanced Transducer Devices) with a
female DB-25 and female DE9 connector on the rear edge.
There's a 40-pin IC on it labeled 'printer', as well as a 24-pin IC labeled
'mono', and a 6845 CRT controller. Fair enough, and initially I'm thinking
that it's just a reworked clone of an IBM MDA card - but also present on
the board are two 48-pin ICs, which suggests there might be more to it than
that; sure, I remember there being a lot of TTL logic on the IBM MDA board,
but I'm surprised it needs two 48-pin ICs to condense it all.
Unfortunately the pair of 48-pin chips are custom parts (as are the 'mono'
and 'printer' ICs) - one's branded ATD1/BLOWD/802D8643LD and the other
ATD2/WIND/8038637LDC.
Does anyone remember this board and can tell me if it is something more
than just MDA/parallel? There's no separate ROM chip, but I suppose it's
entirely possible that it has some firmware embedded in one of the large ICs.
cheers
Jules