Re: Prodos Woes

[dalloff@gcfn.org (Dave Althoff Jr)]

Charlie (charlied@NOSPAMbboard.com) wrote:

: > Now getting down to the base of your
: > problem. If you wish to poke data into the screen area, the best
: > way will be to first transfer the screen area to memory that is
: > free for use. Then, BSAVE it. Now to BLOAD it, then transfer it
: > back to screen area with code. I believe you can also load screen
: > data into another page of memory and redefine that area as the
: > new screen area, not sure though. Anyone???

: There is a seldom used "page 2" of text, starting at $800 and ending at $BFF. I
: believe accessing $C055 (49237) turns on page 2.  On a IIgs I believe you have
: to have the "Alternate Display Mode" turned on for this to work.

It's seldom used because under normal circumstances, Applesoft program
storage starts at $0801, so if you do any programming in Applesoft without
changing some critical pointers first, you'll overwrite that text page. 
Alternatively, if you try to load that text page, you'll overwrite your
BASIC program.

--Dave Althoff, Jr
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