Identifying a Motolora chip - MC14544?

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Mon Feb 24 17:33:00 2003

> Wasn't that chip used in the Tandy TRS-80 Model 100 machines.

I thought the M100 uses the 14412 chip...

>
> I remember playing with the Band Pass filters to convince the TRS-80 to work
> with CCITT tones, instaed of the Bell tones that were used in USA. That was
> a while ago

IIRC, the 14412 didn't demodulate CCITT tones reliably at 300 baud. The
better-designed UK modems that used this chip at all used it for the
modulator only and used something like an XR2211 for the demodulator.

-tony
Received on Mon Feb 24 2003 - 17:33:00 GMT