LDTXT.DOC

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Loadtext 40/80


This program will allow you to read any
sequential disk file saved as Pet Ascii
code.

Features and Operation:

     1. Text files, such as those
downloaded with VIDTEX can be viewed in
80 columns (if they were originally set
up that way) with the help of an 80
column adapter (I use the B.I.-80), or
with the "Screen 80" program published
in the September 1984 issue of
COMPUTE's Gazette.  Standard 40 column
mode can also be used.

     2. Output can be to either the
screen or printer.  I configured the
program for my setup (a Gemini 10X with
Tymac's "The Connection" interface).
The printer's device number and
secondary address can be easily
changed: they're in line 50.

     3. Because text files are LOADed,
they will enter the computer as fast as
any program of the same size.  This
keeps the drive from running the whole
time the file is being read, and may
ease the strain on a hot, stressed
1541.

     4. Maximum file size is 115 disk
blocks or about 29440 bytes.  *** DO
NOT EXCEED THIS SIZE *** as it may
cause system lockup.  The program does
*NOT* check this, so you must!

     5. To temporarily freeze the
output, press the space bar.  Press it
again to restart display or printing.

     6. Press 'f1' to end the display
while text is being printed to the
screen (or printer).This will get you
to the "print buffer again?" prompt.
Select "N" to end.  ALWAYS use this
method to end the program as it resets
the Basic pointers to their normal
positions.

This program works by lowering the top
of Basic to 3048 and using the majority
of RAM for a large text buffer.  Text
files are loaded starting at that
address up to the end of the file.
Once again, check the size of your file
to be sure it doesn't try to load into
the area occupied by your 80 column
board, I/O devices, KERNAL ROM, etc.
 
I used a short machine language routine
to load the text. It is POKE'd into the
cassette buffer each time the program
is run.  What it does, in effect, is to
"fool" the computer into believing the
text file is an ML program.

If you have any questions or comments
contact me by Email.


Alan Murphy  75236,1433
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