Re: 80 Columns under cc65?

["Dave Althoff, Jr." <dalloff.gcfn.org@sbcglobal.net>]

John B. Matthews <nospam@nospam.com> wrote:

: I'm thinking I can just jsr $c300 and copy the updated page zero vectors 
: (36.39) to the Basic system page (be30.be33). To exit, I issue a 
: control-U and restore the system page.

I'm not nearly as good with ProDOS as with DOS 3.3 with such things...
But if you do a JSR to $C300, you will disconnect BASIC.SYSTEM (or 
whatever you're using) because the routine at $C300 isn't smart enough 
to reconnect DOS; that's why you have to call the [Pro]DOS warmstart 
vector at $3D0.  [Pro]DOS IS smart enough to keep track of the I/O hooks 
at warmstart and NOT disable the 80-column software.  In fact, calling 
the warmstart vector should copy the CSW and KSW vectors ($36-$39) for 
you.  Or was that the call to $FB6F that I always made before calling 
$3D0...can you tell I haven't even thought about this in years?  8-)

But why enable the 80-column software the hard way, when you can let 
[Pro]DOS do it for you?  I saw it in this thread:  PRINT CHR$(4);"PR#3" 
will enable the 80-column software WITHOUT disabling BASIC.SYSTEM.
 
: Alternatively, if the loader enables 80 columns, printing control-Q and 
: control-R switch to 40- and 80-columns, respectively.

Be careful.  I always made it a habit to only use the 80-column display 
driver in 80-column mode, and if I wanted to operate in 40-column mode, 
I always went back to the non-80-column display driver by printing a 
CHR$(21).  When I started 80-column mode, I was always careful to print 
something (a few spaces will do) on the screen, then clear it, because 
some versions of the 80-column firmware would behave strangely if I 
didn't.

--Dave Althoff, ][.
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