15 Mar
2013
15 Mar
'13
1:10 a.m.
On Fri, Mar 15, 2013 at 03:51:00AM -0400, Ethan Dicks wrote:
On Thu, Mar 14, 2013 at 2:00 PM, Paul Birkel
<pbirkel at gmail.com> wrote:
I just looked at a couple of schematics and the pinout looks similar/identical
to the GI AY5-1013 too. Might be easier to find since they sure used to be
plentiful (Radio Shack sold them, and the AY3-1015 5V-only version too which
I think is pin-compatible).
Software compatibility is almost meaningless since everything is brought out to
individual pins (there's no register file like in an 8250), so bit order etc.
is up to the designer. IIRC the parity/etc. controls are on transparent
latches so you can make that be a writable register, or else enable it all the
time and use DIP switches etc. (which makes more sense for typical DEC
applications).
John Wilson
D Bit
The early PDP-11 uses a ?DEC 1801 UART? in
multiple modules.
I haven't checked schematics myself, but the TR1602 dates back to
1971. It's a 40-pin UART, the first, IIRC.
Datasheets aren't hard to find for it. The receive bus is pins 5-12, the
transmit bus is pins 26-33, and for power, +5 is on pin 1, -12 is on pin 2
and GND is on pin 3.