Re: GS/OS basics...

["Rob Greene" <RobGreene@gmail.com>]

Jeff Blakeney wrote:
> On 25 May 2005 10:54:00 -0700, "Rob Greene" <RobGreene@gmail.com>
> wrote:
>
> >BTW, what is the "Alternate Display Mode" that shows up in the IIGS
> >control panel?  As I remember, it can be turned on or off which doesn't
> >explain too much.
>
> The IIgs, by default, does not shadow the area for text page 2
> ($800-$BFF) from bank $00 to bank $E0.  I think it was done to speed
> up the memory shadowing because very few programs ever used text page
> 2.  If you turn on Alternate Display Mode then text page 2 will get
> shadowed but your machine will run a little slower.

Thanks!

Does anyone have any information on the IIGS?  I've noticed that ROM
appears to be in the $E0 page (bank??) and higher, I think but not in
the $00 page.  I've been revisiting Merlin-8/16 and Applesoft but got a
bit fuddled when I go to list a ROM routine and it's not there until I
checked the $FF bank.  I later saw some reference to $E0/xxxx and the
F800 ROM routines, so I suspect that is the "proper" area.

I haven't had any trouble, but it is weird to me since all I've ever
dealt with is Apple II, II+, IIc and IIe's.

Now that I think of it, I'd be interested in how to hit super hi-res
and (possibly) music.  Can it be done from ProDOS 8 applications?  (I
don't see why not...)  Not sure if I'll ever go there, but my son's
adventure game would be a  lot snazzier if it weren't done in lores!!
(Gotta start somewhere.)  Not sure if I'm serious enough to buy IIGS
references but somebody somewhere must have a tad bit of information
online.

This is more fun than work, let me tell ya!  I've also resussitated
some old stuff I wrote if anyone is interested.  Once I get my son's
game working, I'll put it up too.

Thanks!
-Rob