Chapter 2. System Commands; System Overview; System Command Descriptions - IBM 5100 Apl Reference Manual

Chapter 2. System Commands
10
SYSTEM OVERVIEW
The 5100 contains an active workspace, which is the part of internal storage where
the user's data and user-defined functions (programs) are stored. When the power
is turned off or the RESTART switch is pressed on the 5100, all the data in the
active workspace is lost. However, the
~ontents
of the active workspace can be
saved on tape (stored workspace) and then read back into the active workspace
for use at a later time (see
System Command Descriptions
in this chapter). The
contents of the active workspace then exist in both the active workspace and on
tape.
The tape is your library; that is, it is a place where you can store data for later
use. Before a tape can be used, it must be formatted. A formatted tape contains
one or more files where data can be stored. Each file has a file header, which con-
tains information about the file. See the)
LI B
system command in this chapter
for a description of the file header.
The system commands, which are used to control and provide information about
the system, are discussed next.
SYSTEM COMMAND DESCRIPTIONS
The following list shows how system commands are used to control and provide
information about the various parts of the system. Each system command is
described in detail later in this chapter.
Commands that Control the Active Workspace
Command
)CLEAR
)COPY
)ERASE
)LOAD
)PCOPY
)SYMBOLS
)WSID
Meaning
Clear the active workspace.
Copy stored objects (see note 1) into the active workspace.
Erase global objects (see note 1) from the active workspace.
Replace the active workspace with a stored workspace.
Copy stored objects (see note 1) into the active workspace and pro-
tect objects in the active workspace from being destroyed.
Change the number of symbols allowed in the active workspace.
Change the active workspace 10.