BBS: Inland Empire Archive
Date: 01-01-93 (01:01) Number: 389
From: DIK COATES Refer#: NONE
To: CORIDON HENSHAW Recvd: NO
Subj: Smooth Scrolling Conf: (2) Quik_Bas
Hi... was looking at my books... smooth scrolling is possible in text
mode... implemented in a similar fashion to my graphics mode stuff...
It is a matter of tagging the vertical retrace and then manipulating
the Preset Scan Row register of the CRT Controller... This is the
approach I've used in my graphics mode stuff... and can be twisted
a bit to handle text mode... I had never considered it for text mode...
Will put something together in the new year... The big difference
between it and that posted earlier is that a smooth scroll does
happen... not line by line... but nearly the entire procedure will
have to be executed in ASM... Don't know how to tag the vertical
retrace in BASIC... but easily done in ASM... also may tend to be
a little touchy about the graphics adapter... my graphics stuff
is nearly all written in ASM and handles most adapters, but I've
never had a need to make it bulletproof against all adapters...
Will glue something together early in the New Year...
Regards and all the best in the upcoming New Year, Dik, Oshawa, Canada
... Taglines that users would love to read and forget! -Dik
___ Blue Wave/QWK v2.10
--- Maximus 2.00
* Origin: Durham Systems (ONLINE!) (1:229/110)
