PDP-12 Restoration at the RICM (tony duell)

tony duell ard at p850ug1.demon.co.uk
Mon Jun 15 00:01:36 CDT 2015

> 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

Do you want 3 separate modules, or one switchable, or what?

> 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.

Hang on. I thought the M405 was just a crystal oscillator without a divider. Are
you sure there is no extra division on other modules? 110Hz is very slow for
a crystal oscillator, after all.


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