88-ACR KCS modification
ajp166 at bellatlantic.net
Tue Dec 26 05:58:39 CST 2006
>Subject: 88-ACR KCS modification
> From: Grant Stockly <grant at stockly.com>
> Date: Mon, 25 Dec 2006 14:00:27 -0900
> To: cctalk at classiccmp.org
>I'm trying to modify my 88-ACR to work with the KCS specification.
>Does anyone know where the information on modifying the 88-ACR to
>read/wrote KCS audio is?
>Also, I was wondering if anyone ever looked at this card? The XR210 chip
>MITS used for demodulation of the FSK signal is capable of MODULATING
>too. (with both mark and space frequencies). Does anyone know why they
>would have used 5 ICs and a few opamps to do the modulation when they could
>have used the other half of a chip already present?
Not possible. The ACR is simple FSK and the KCS is redundent FM.
As to the latter question of component use... the ACR was intended as a
modem (bell 103) and it's design was based on that.
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