Commodore 1541-II - Page 102

SEQ.FILE.DEMO AND REL.FILE.DEMO
These two files are included as programming examples or guidelines when writing
your own programs. They also illustrate the important technique of checking the error
channel after each access to the disk drive.
SD.BACKUP.xx
These three programs are entitled SD.BACKUP.C64, SD.BACKUP.C16, and
SD.BACKUP.PLUS4. Each, when loaded into its respective computer, allows you to
create an exact duplicate of a diskette by switching a blank diskette and the diskette to
be copied in and out of the drive at the appropriate times. Loading and running them
incorrectly may damage a diskette.
PRINT.xx.UTIL
These three programs are actually entitled PRINT.64.UTIL, PRINT.+4, and
PRINT.C16.UTIL. They provide two functions: a printout of any Text-Mode screen
display, and a listing of the contents of all sealer (non-array) variables in a Basic pro
gram to screen or printer. Any CBM printer may be used for either function. Printing of
reverse-video and graphics characters depends on the specific printer model used. These
programs can run from tape.
C64 BASIC DEMO +4 BASIC DEMO
These programs offer a set of demo routines which can perform minimal system
testing on the computers. Routines are provided for testing the video and sound output,
keyboard and joy stick input, and disk unit I/O.
LOAD ADDRESS
LOAD ADDRESS is a simple program that tells you where a program was origi
nally located in memory. Some programs can only run in the same locations from which
they were saved. Load such programs with LOAD"filename",8,l.
UNSCRATCH
Allows you to restore a file that's been deleted (scratched) from a diskette as long as
the diskette hasn't been written to since the scratch was performed.
HEADER CHANGE
Allows you to rename a diskette without losing the data currently stored in the
diskette.
IMPORTANT NOTE:
Your Test/Demo diskette
may contain additional
programs. Commodore
may update the diskette
from time to time.
ALL ADDITIONS, DELETIONS, OR MODIFICATIONS TO THE PRO
GRAMS LISTED IN THIS APPENDIX WILL BE NOTED IN THE "HOW TO
USE" PROGRAMS ON YOUR TEST/DEMO DISKETTE.
94