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| From: Marko_Mäkelä
Date: 1999-01-20
Subject: Re: Check SID Version !
|
On Wed, 20 Jan 1999, Edhellon/Resource wrote:
> According to the original mail the return value is:
> -$00 : OLD
> -$FF: no SID found there.
> -anything else: NEW.
If there's no SID connected, the data read will be just like the data read from $de00-$dfff, i.e. if the computer is "$de00 compatible", then the byte read from unconnected address space will be equal to the byte that was read by the video chip in the previous cycle. Not even nearly all C64s are "$de00 compatible": there may be some randomness in the data. On a compatible machine, it is possible to write a program that runs in the
$de00-$dfff area, or even in the color RAM.
Marko
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