Re: DHGR Color Question

[Jeff Blakeney <CUTjblakeney@sympatico.ca>]

On 01 Jan 2004 01:26:26 GMT, mjmahon@aol.com (Michael J. Mahon) wrote:

>When in DHGR mode, there are 140 pixels per line, with 16 color
>possibilities.  The colors are still "artifact" NTSC colors produced
>by four bits per pixel (two from the main bank and two from the
>auxilliary bank).

I may be wrong here as it has been a long time since I've done
anything with DHR graphics but aren't the pixels in colour mode split
up kind of weird?  If I remember correctly the first pixel's 4 bits
are all in one bank and the second pixel's 4 bits are split with 3
bits coming for the first bank and the last bit coming from the second
bank and so on across the screen.  This is because the 8th bit of each
byte is not visible (was used for colour shifting in HR graphics but
does nothing in DHR graphics).  It would look something like this (use
a mono-spaced font):

Bank   Main     Aux    Main     Aux    Main     Aux    Main     Aux
Pixel 1111222 2333344 4455556 6667777 8888999 9AAAABB BBCCCCD DDDEEEE

-- 
 Jeff Blakeney - Dean of the Apple II University in the
                 Apple II Community on Syndicomm.com
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