18 May
2000
18 May
'00
9:41 p.m.
On Thu, 18 May 2000, Vintage Computer GAWD! wrote:
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
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.