Applications Programs - Radio Shack TRS-80 Model 4 Owner's Manual

.%08%08 This comment is positioned at the
second tab stop,
IIPAUSE %0A%0A%0A This line appears 3 lines down
If you place the character BEFORE the period, TRSDOS does not
recognize it as a comment line and the JCL aborts.
If you place the character AFTER the macro, the //PAUSE is
displayed and the remaining message line is displayed 3 lines lower
on the screen.
Using the tab and Iinefeed characters in this manner can sometimes
help to improve the readability of the messages displayed during JCL
execution.
Using TRSDOS
JeL
To Interface With Applications
Programs
This appendix describes how to use JCL to start up and control your
applications programs.
Two languages are discussed: BASIC and Z-80 assembly.
Interfacing With BASIC
A JCL file is the perfect method to interface between the operating
system and the BASIC language. JCL can be used to create
procedures that require only the inserting of a diskette to start up a
program. Additionally, you can utilize the features of JCL from within a
BASIC program.
Examples
To use a JCL file to initiate an automatic start-up of a BASIC
program, you can use the AUTO library command to execute a JCL
file.
Assuming the JCL file is named BAS/JCL, issuing the command:
AUTO DO BASI JCL (ENTER)
automatically executes the desired BASIC program every time the
computer is booted with the AUTOed system disk.
In order to execute a BASIC program from a JCL file, layout the JCL
file as follows:
1. Establish any necessary drivers, filters, or other TRSDOS options.
2. Enter BASIC with any necessary parameters (such as memory
size and number of files).
3. RUN the BASIC program.
A-3D