10 Feb
2009
10 Feb
'09
8:34 a.m.
On Sunday (02/08/2009 at 05:10PM -0600), Chris Elmquist wrote:
Now I'm working on figuring out the serial and parallel interfaces.
The brains are an 8048 microcontroller and then it looks like the serial
interface is handled by a classic old AY-3-1015 UART, which I'm assuming
front-ends the parallel interface. Lots more discovery there...
Just to close out this saga, I got lucky and after only a few trial and
errors, discovered that the unit accepts 300 baud, 8 bit, no parity,
1 stop on a female DB25 DTE connection. It needs DSR on pin 6 asserted
before it will respond.
But then whatever I send down the wire with those parameters, gets
punched on the tape. It works! It's very fast and very quiet compared
to an ASR-33 :-)
This was a nice save.
Still searching for a manual though, because there are switches in there
that I don't know what they do... and you know, a guy could loose sleep
over that.
Chris