5100 Special Keys - IBM 5100 Basic Reference Manual

4
5100 Special Keys
The following keys have special functions relating to 5100 operations:
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o
(Attention') - You can press the ATTN key to stop system operations.
While you are entering data at the keyboard, you can press ATTN to
blank everything from, and including, the cursor position to the right
on the input line of the display screen. You can then continue
entering information. In addition, ATTN and HOLD are the only
keys that are active when the display screen flashes to indicate detec-
tion of an error. After you press ATTN to stop the flashing display
screen, all keys are active and you can proceed.
(Command) - When you hold down the CMD key, you activate the
top row of alphameric keys, which cause the command keyword to
be
inserted on the input line when the number below the word is also
pressed. The command operation is executed when you press
EXECUTE. The CMD key is also used with the numeric keys (on the
right side of the keyboard) to initiate keys functions. Avoid holding
down the CMD key and pressing HOLD; this activates a function
restricted to use by service personnel. Holding down the CMD key
and pressing a key with a BASIC statement keyword on the front will
enter the keyword beginning at the current position of the cursor.
When you press EXECUTE, the system processes the line of data that
you just entered on the input line. In addition, you can press
EXECUTE to resume interrupted processing. Pressing EXECUTE
when the input line is blank causes the same action as a GO command
(see Go
Command,
Chapter 2).
When you press HOLD, all processing stops unless the display screen
is blank. Processing resumes when you press HOLD a second time.
Thus, the HOLD key allows you to read displayed data during an
output operation. While processing is stopped, the CMD key and the
arithmetic operator keys on the right of the keyboard are restricted
to use by service personnel.
(Shift) - While you hold down a shift key, you can select an upper-
case symbol for input.
(Copy Display-when CMD is held down) - When you hold down CMD
and press the key below Copy Display, all data displayed on the screen
is printed by the attached printer. You can use the copy display func-
tion when the 5100 is in a hold state, or anytime the 5100 is waiting
for input from the keyboard. On a combined BASIC/APL machine,
the
CO
key is used to activate the copy display function. The
L32 64 R32 switch has no affect on printed data.
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