Commodore Plus 4 - Page 132

HELP HELP
The HELP command is used after you gel an error in your program
When you type HELP, the line where the error occurred is listed, with '—
the portion containing the error displayed in flashing characters
KEY ^key *■ stnn91
There are eight (8) function keys available to the user on the Pius 4
computer four unshifted and four shifted. The Plus/4 allows you to
define what each key does when pressed.
KEY without any parameter specified gives a listing displaying all the
current KEY assignments. The data you assign to a key is typed out
when that function key is pressed The maximum length for all the
definitions together is 128 characters. Entire commands (or a —
series of commands) can be assigned to a key. For example
KEY 7. "GRAPHICO" + CHR$(13) + "LIST"1 + CHRS(13)
causes the computer to select text mode and list your program
whenever the 'F71 key is depressed (in direct mode) The CHRS(13) is
the ASCII character for RETURN Use CHRS(34) to incorporate a
double quote into a KEY string.
The keys may be redefined in a program For example —
10 KEY 2."TESTING" + CHRS(34):KEY3, "NO"
I0FORI-1 TO8:KEYI,CHR$(I- 132):NEXT
defines the function
keys as they are de
fined on the Commo
dore 64 and VIC 20
To restore all function keys to their default values, reset the Plus 4 by
turning it off and on. or press the RESET button.
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