Re: Hopefully last dumb newbie question.

[Slick <Slick_RCBD@hotmail.com>]

Jeff Blakeney wrote:
> 
> On Thu, 04 Jun 1998 13:43:07 -0500, Slick <Slick_RCBD@hotmail.com>
> wrote:
> 
> >Now the question. What exactly does the Alternate Display Mode DA do? I
> >think it has something to do with the secondary text screen (Address
> >$800-C00 on earlier models), but am not sure. None of the books at my
> >library have anything about it. I do know about the shadowing to banks
> >$e0 and $e1, and have looked at assembly language programming on the
> >IIGS. I just never had the money to buy ORCA or APW. I've used the Hyper
> >C (ProDOS 8, and free) assembler to write programs.
> 
> If I remember correctly, text page 2 doesn't get shadowed or the
> softswitch for changing to text page 2 doesn't work or something like
> that.  The Alternate Display CDA allows you to enable or disable
> another shadowing routine, which is slower than the hardware
> shadowing, but allows certain older 8 bit programs to use text page 2
> so that they will work correctly.
> 
> If an 8 bit program crashes or doesn't run correctly, try enabling the
> Alternate Display mode and try it again.  It just might work.
> 
> === I've had enough SPAM.  Cut the obvious from my address to email me. ===
>          Jeff Blakeney - Dean of the Apple II University on Delphi
I never thought about crashes. The only time I used Alternate Display
Mode is when I run an old program (like Thunder Mountains Pac-Man) and
the screen is filled with 2s.
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