Date   : Sat, 03 Dec 2016 00:26:48 +0000
From   : jgh@... (J.G.Harston)
Subject: Updated BeebWiki articles

Rob Coleman wrote:
> Nicola Giacobbe wrote:
>> By the way and asking to all the experts out there: is there some way 
>> to
>> reduce the vertical resolution of a MODE while keeping it 
>> screen-height?
>> ...
>> Something akin to a 256x128 MODE 5 could be very useful.
> 
> I don't think a full screen 256x128 mode 5 is possible due to the way 
> that
> the CRTC automatically increments the row counter.

You can reduce the number of displayed raster lines, but you can't 
change the "distance" between each line. If your monitor is six inches 
tall, you can program the CRTC to display 128 lines, but the display 
will be three inches tall, as in this example:

MODE 1                       :REM Select an 8 raster/text line mode
VDU 19,0,4,0,0,0             :REM So we can see the background
VDU 23,0,6,128/8,0,0,0,0,0,0 :REM 128 raster lines displayed

-- 
J.G.Harston - jgh@...      - mdfs.net/jgh