RE: Real Time Clock on Cassette Write/Sense lines

From: Baltissen, GJPAA (Ruud) <>
Date: Sat, 11 Feb 2012 09:29:22 +0100
Message-ID: <>
Hallo Jim, 

> But, I was afraid such constant cycling of the MOTOR line
> with a datasette present might cause it's own issues.

- The older CBMs have two cassette ports with each their own motor line,
so no problem here. 
- How many people use still their cassette recorder (CR)? Unplugging the
RTC for those rare moments they use it shouldn't be a problem, IMHO.
- But for those people which use it regurlary, make a RTC with an edge
connector to plug the CR in and add a switch to disable the motor line
for the time you don't need the CR. Disadvantage: more expensive.
- Even a step further: make a pcb for inside the C=. First advantage:
you can directly tap the motor signal at TTL level. And. if needed, let
the owner add a switch to disable the motor line. This can be done by
desoldering one pin of the transistor and wire the pin and the hole to a
switch. Advantages: even less expensive (no connector(s) needed) and no
removal needed during transport. One can even use a bigger (rechargeble)

    / __|__ 
   / /  |_/     Groetjes, Ruud 
   \ \__|_\ 


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Received on 2012-02-11 09:00:14

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