14 Jun
2015
14 Jun
'15
2:42 p.m.
Date: Sun, 14 Jun 2015 15:25:08 +0000
From: tony duell <ard at p850ug1.demon.co.uk>
To: "General Discussion: On-Topic Posts" <cctech at classiccmp.org>
Subject: RE: PDP-12 Restoration at the RICM
Tony, thank you for your offer to supply replacement M452 Variable Clock
modules for the console. We already have one jumpered for 110 baud for the
Teletype. The other two M452 modules should be jumpered for 9600 baud and
38400 baud. The second serial port uses a M405 Crystal Clock module with a
different pinout and clock outputs than the M452. We don't have any of
these modules, so the three that we need should be jumpered for 110 baud,
9600 baud, and 38400 baud. The shipping address for the RICM is on the WWW
page.
--
Michael Thompson
Warren made an Arduino based programmable baud
rate generator that works
for both serial ports. After some debugging, it works nicely.
I am sorry, but I find that obscene!. To use more components than the rest
of the machine
(probably) just for the baud rate clock is ridiculous. IMHO if you are
going to modify a
vintage machine, particularly one as rare as a PDP12, you should use the
components
that were available at the time. It's not as if a programmable buad rate
generator is hard
to make from TTL either. In fact given the Arduino thing needed 'some
debugging' it might
well have taken less time to do it in hardware.
-tony