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Atari coding BBS
| TT and Video Base Low |
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Posted by: Cyprian
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Jun,15.2012-00:59
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Hi All,
I'm just struggling with TT Shifter, and it seems that ProfiBuch is wrong regarding Video Base Low. On page 1055 they mentioned two different addresses for Video Base Low: $FFFF820D and $FFFF820C (which one is valid?) and they mentioned that Video Base Low address have 8byte boundary (due to 64bit memory). "Damit kann der Bildschirmspeicher im ST -RAM immer nur an einer 8-Byte-Schwelle liegen"
I modified both addresses and there were no any impact on video. It seems that Video Address in TT in opposite to STE can only be set every 256 bytes (as in good ol' ST).
If its true, there is no possible to do hardware scrolling on TT.
Can you comment that? Maybe I overlooked someting?
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