Ron Garret <rNOSPAMon@flownet.com> wrote:
| This card has no connectors on it at all. That's what makes it so
| mysterious. Here's what the thing looks like:
Hmmm... All the small chips are low-density (SSI) 74LS logic,
so the big one has to be where all the real action is.
If I'm reading the number correctly, the big one is an
RCA COM6116AE2, which a number of specialty websites list
among their obsolete/hard-to-find items, but for which they
give only an email or telephone contact, not a datasheet.
My guess, based on the era, is that it's just a RAM chip of
some sort, used as a buffer [since main memory on the machine
was so small], with the actual spooling being done by some
kind of terminate-and-stay-resident program (driver). This is
confirmed by a search for "RCA 6116 RAM" which suggested that
it's a 2K x 8 CMOS static RAM.
Rob Warnock <firstname.lastname@example.org>
627 26th Avenue <URL:http://rpw3.org/>
San Mateo, CA 94403 (650)572-2607