GWBASIC User's Manual

GW-BASIC User's Guide
Sample GW-BASIC command lines are as follows:
The following uses 64K bytes of memory and three files; loads and executes the program file
payroll.bas:
A>gwbasic PAYROLL
The following uses 64K bytes of memory and six files; loads and executes the program file invent.
bas:
A>gwbasic INVENT /F:6
The following disables RS-232 support and uses only the first 32K bytes of memory. 32K bytes
above that are reserved for user programs:
A>gwbasic /C:0 /M:32768,4096
The following uses four files and allows a maximum record length of 512 bytes:
A>gwbasic /F:4 /S:512
The following uses 64K bytes of memory and three files. Allocates 512 bytes to RS-232 receive
buffers and 128 bytes to transmit buffers, and loads and executes the program file tty.bas:
A>gwbasic TTY /C:512
For more information about RS-232 Communications, see Appendix F.
Redirection of Standard Input and Output
When redirected, all INPUT, LINE INPUT, INPUT$, and INKEY$ statements are read from the
specified input file instead of the keyboard.
All PRINT statements write to the specified output file instead of the screen.
Error messages go to standard output and to the screen.
File input from KYBD: is still read from the keyboard.
File output to SCRN: still outputs to the screen.
GW-BASIC continues to trap keys when the ON KEY(n) statement is used.
Typing CTRL-BREAK when output is redirected causes GW-BASIC to close any open files, issue
the message "Break in line nnnn" to standard output, exit GW-BASIC, and return to MS-
DOS.
When input is redirected, GW-BASIC continues to read from this source until a CTRL-Z is
detected. This condition can be tested with the end-of-file (EOF) function. If the file is not
terminated by a CTRL-Z, or if a GW-BASIC file input statement tries to read past the end of file,
then any open files are closed, and GW-BASIC returns to MS-DOS.
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