POFOTIF DOCUMENTATION
This file documents the experiment to create a program to display a TIF file on the Atari Portfolio screen.

INTRODUCTION
Most programs for the Atari Portfolio run in normal textmode. But the LCD screen also allow an excellent graphics mode of 240x64 pixels.

The POFOTIF program uses this graphics mode to display the contents of a socalled TIF file. The TIF format is a standard graphics format used in many environments. PC owners can create TIF files or convert other formats to TIF with f.i. Paintshop Pro.

THE SOFTWARE
The program is used as follows:
- start the program with a TIF file as parameter : POFOTIF name.tif
- the screen is now filled with a part of the contents of the TIF file
- using the arrow keys the file can be scrolled across the screen
- exit the program by pressing ESC twice.

Note 1: The TIF file has to be in B&W, UNCOMPRESSED format. Other formats will give strange results.

Note 2: If no filename as parameter is given the file PORTLOGO.TIF is loaded by default.

Note 3: The standard REFRESH function for the LCD screen is not used because it's sloooooooooow. My version is approximately a factor 10 faster.

THE FILES
The Program  is created using Turbo Pascal 6.0. Special feature is the ASM possibility. Converting to another Turbo Pascal version is possible, but the ASM routine will have to be replaced (source is still present but commented out.

The following files are in hte ZIP file:
- pofotif.exe			the executable
- pofotif.pas			the source
- pofotif.txt			this file
- portlogo.tif			a sample TIF file
 
KNOWN BUGS
These bugs are guaranteed to be present, but I was to lazy to remove them
- if a TIF file is smaller then the LCD screen you will see a "shadow" copy
- if you scroll outside the right or bottom boundary of the TIF file, strange pixels and a program halt may occur.

FURTHER DEVELOPMENTS
Some ideas for further development are:
- remove the known bugs
- investigate speed improvements

WARRANTY DISCLAIMER
Please note that this experiment works fine on my Pofo, but software comes without any warranty. If it does not work, you're on your own!!!!

COPYRIGHT
You can use the software for personal use freely. Commercial use is not allowed without contacting me. (c) Gerard Rutten, The Netherlands, March 1998.