On 1/23/14 12:56 PM, Jules Richardson wrote:
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.
Sounds more like a Hercules clone.