SSC Failure - odd symptoms

[Zero dB <no@email.com>]

Greetings all, 

I have been transferring all of my old favorites to some fresh NOS
polaroid floppies I scored en masse from ebay. having a blast with
sneakers, death in the caribbean, aztec, etc. :)

I left it alone for a few days, then came back to it. Just for kicks,
I took out the mainboard and all the peripherals to blow out the
system with my snazzy new air compressor. 

Re-assemble everything, and now I can't transfer images to or from ADT
on my PC with a known-good cable/pc config. 

I can get an SSC: prompt via "IN#2, ctrl-a" i think it was. It
responds to commands. But, no transfers. ADT just sits there "Awaiting
response from PC". 

I tried other slots for the SSC (which is usually in slot 2), same
thing. The disk controller, the motherboard and everything that i can
sense is working just fine, except for transfer initiation on the SSC.
ADT "sees" the card to the point that it knows there is a card there
(that is to say, it doesn't give the 'empty slot' error), but still
just sits there "awaiting answer from PC"

I have verified the cable and serial port in question on another term
server and all is well. 

It it possible for the SSC to fail in such a way that transfers won't
work, but the logic still does ?  I can "session" into the card and
get a responsive prompt, but can't transfer. 

To re-iterate, this was a prior working config. I verified the PC
serial port and cable are still good with another term server (and
concurrent 'wiggle test' to verify not positional) 

Thanks for any insight! 

Jayson

jayson dot anderson AT removethis gmail com