Re: CIA Serial Data Register

From: Gerrit Heitsch <>
Date: Mon, 23 Feb 2015 14:05:54 +0100
Message-ID: <>
On 02/23/2015 12:23 PM, Michael Huth wrote:
> Hallo,
> from my experience quite a few routines for hardware extensions used the
> CIA SDR register as temporary memory. (e.g. the IEEE488 interface
> published in 64er magazine) Since this register is by default unused it
> was a top candidate to be used.

What makes it a better candidate than any RAM cell? It's not in the zero 
page which means it's as fast as any RAM location.


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Received on 2015-02-23 14:00:04

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