28 Nov
2007
28 Nov
'07
4:28 p.m.
On Nov 28, 2007 7:16 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
I think you mean 6847 here.
In any case the video is geenrated by a combination of the 6883 SAM (which
adderesses the main meory) and the 6847 VDG (which turns the data read
from
RAM into the video signal). IIRC, the semigraphics mode come from
programming
the SAM for graphics and the VDG fro text.
Right: the 6847, sorry.
(Out of idle and off-topic curiosity, does a Dragon also display "MICROSOFT"
on the screen when you do a "CLS 9"?)