Cool AppleSoft BASIC trick I never thought of before

From: Charles P. Hobbs <transit_at_lerctr.org>
Date: Thu May 18 21:41:01 2000

On Thu, 18 May 2000, Vintage Computer GAWD! wrote:

> On Thu, 18 May 2000, Charles P. Hobbs (SoCalTip) wrote:

> Ah. Thanks for clarifying that.
>
> Well then this brings me back to wondering how those programs that allowed
> mixed video modes on the Apple ][ worked. They required no hardware mods.
> Hmmm.

I wasn't aware that any such programs existed, especially for the II. Any
examples I should be on the lookout for?

>
> > In any event, once you had the vertical blanking information, you could
> > write machine language programs that would switch between Apple graphic
> > modes just about anyplace on the screen (within limits). You were more or
> > less limited to static displays because of the timimg requirements, but
> > you could still do some interesting stuff. I typed in a few of the
> > programs, and still have them sitting around on a disk if anyone is
> > curious...
>
> The programs I'm talking about I saw as demos on that Magazine Diskette
> (Magazette) subscribtion service called SoftDisk (anyone remember that?
> lots o' cool stuff on that). And they had hi-res animation mixed with
> lo-res graphics and text-mode text. One day I will have to dig those
> disks out and dissect the code to figure out how they did it. I don't
> know why I didn't try to figure it out way back when.


I have a bunch of Softdisk disks, mostly for the GS though (some will
work on earlier machines). I haven't really looked through them all
Received on Thu May 18 2000 - 21:41:01 BST

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