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| From: Rachy (all posts)
Date: 1999-03-19
Subject: Re: Lightpen
|
Ahojka!
> Hm. I missed it. $FF1C and $FF1E is the vertical and $FF1E is the
> horizontal. but it's shifted one bit right, so the least significant bit
> is not present.
That is right, but there is no possibility of using this registers for an acceptable resolution. Main processor is far too slow for this.
When sign came in you need at least 3 op to execute while read from $FF1C, and as you said, LSB is not present there. (Cannot be used for precise horizontal position.)
> Yes. I looked for it and found. $FD0D is the "Program-Reset/Status"
> register of the ACIA. (Program reset for writing and status for reading)
>
> It's layout:
That is all nice, but I see no connection then in these two stories...
Lavina's picture shows there is nothing but a joy-port connection.
The program might be wrong then?
Bye:
Rajnai Almos
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