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Re: Double lowres graphics?

Subject: Re: Double lowres graphics?
From: Rubywand <rubywand@swbell.net>
Date: Mon, 05 Feb 2001 17:07:45 -0600
Newsgroups: comp.sys.apple2, comp.sys.apple2.programmer
Organization: SBC Internet Services
References: <3A7AF1E4.76B29F3A@usb.com> <3A7AFB64.791A7468@mts.net> <3A7B21DD.FB7C8A0A@usb.com> <1eo9d50.gkt986188rmywN%dempson@actrix.gen.nz> <3A7EBDCD.8082448B@usb.com>
Xref: supernews.google.com comp.sys.apple2:5827 comp.sys.apple2.programmer:514

Dennis Jenkins wrote ...

 ....

> Since I want my code to work on all Apple II's that have hardware
> support for double low-res, I'll write
> the pixel plotting code myself, instead of
> calling Applesoft's implementation.  However,
> how to I programmatically turn on and off
> the 80 column firmware such that the output routine at $FDED will
> understand what I'm doing?  I know I can turn it
> on with a "jsr $c300", but how do I turn it off?
> 
 ....

     There is a simple graphics display program (DO.GR) on the Tnilutil (DOS
3.3) and PDutil (ProDOS) disks which can display hires and DHR. Checking
through the BASIC program and binary code (in DO.DHR.BIN) may be useful. You
can find the disks on Ground at ...

ftp://ground.ecn.uiowa.edu/apple2/useful.stuff/ .



Rubywand

References:
- Double lowres graphics?
  - From: Dennis Jenkins <dennis@usb.com>
- Re: Double lowres graphics?
  - From: Mike Pfaiffer <pfaiffer@mts.net>
- Re: Double lowres graphics?
  - From: Dennis Jenkins <dennis@usb.com>
- Re: Double lowres graphics?
  - From: dempson@actrix.gen.nz (David Empson)
- Re: Double lowres graphics?
  - From: Dennis Jenkins <dennis@usb.com>

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