Re: VIC-II reading starting point reset.

From: tokafondo <tokafondo_at_gmail.com>
Date: Tue, 21 Jan 2020 16:01:07 -0600 (CST)
Message-ID: <1579644067807-0.post_at_n4.nabble.com>
Ok, let me explain here:

AFAIU, one thing is how a bitmap should be written in memory (blocks of 64
bits or 8 bytes), and another thing is how the internal circuits generate
the image to be sent in the out signal.



Bitmap Area starts at line 51 and column 49 ( here
<https://codebase64.org/doku.php?id=base:visible_area>  ). The memory is
organized in 8 byte 'vertical' blocks, but the raster line draws the lines
from left to right, every line, screen wide.

Could I make the VIC start to read *again* from $C000 when it reachs line
#59, instead of keep reading memory 'down' 

Could an interrupt be triggered when it gets to line (in this case) #59,
that would set $DD00 to the 4th memory bank, so the VIC could think it's
starting to read again in $C000 again... but from line #59 instead of line
#51?



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Received on 2020-05-30 00:22:22

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