Chapter 2. System Commands - IBM 5100 Basic Reference Manual

Chapter 2. System Commands
8
Some of the 5100 system commands are listed above the top row of numeric keys
on the typewriter·like alphameric keyboard (Figure 4). These commands allow you
to control tape and printer operations, such as storing a program on tape, loading a
program into the 5100 from tape, and executing a loaded program. System commands
can either be entered character-by-character from the keyboard, or the entire key-
word can be entered by holding down the CMD key and pressing the appropriate
number key below the command (except for MARK, MERGE, and PATCH, which
are not listed). The latter operation inserts the keyword with a single keystroke,
thus preventing possible keying errors and providing faster operation. The system
commands are used to direct the 5100 to perform the following types of system
operations:
• Program Execution - Start or resume execution of a BASIC program or command.
• File Operation - Load or save programs or data on tape, or mark tapes.
• Program Operation - List ano number program statements or merge several
programs into one program.
Parameters required for a command can be entered after the command keyword is
entered. The command operation then starts after you press the EXECUTE key. The
keywords and major functions of the BASIC system commands are:
LOAD
RUN
GO
SAVE
MERGE
RENUM
AUTO
LIST
UTIL
MARK
PATCH
REWIND
RD=
Load work area
Run BASIC program
Resume interrupted processing
Save work area
Merge work area
Renumber statements
Automatic line numbering
Display or print work area contents
Perform utility functions (print/display a tape directory or invoke
communications operations)
Mark tape file
Apply internal machine fix (IMF), tape recovery, or tape copy
Rewind tape
Specify rounding position of printed numeric values