VIC-1212 Programmers Aid Cartridge

Programmer's Aid cartridge


Part number	VIC-1212
ROM size	4K
Start address	$7000
Autostart	No, SYS 28681

The Programmer's Aid cartridge was produced by Commodore to provide a collection of utilities to help both new and experienced programmers to write, edit and debug BASIC programs quickly and easily. The commands added cover line numbering, searching and replacing, and tracing the execution of a program.

In addition commands can be assigned to the function keys, giving a convenient way of executing frequently used statements.

The screen editor was also improved to make changing programs easier.

Usage

To use the cartridge enter

SYS 28681

-- PROGRAMMERS' AID --

READY.

Added commands

The following commands are available in direct mode, they cannot be used within a BASIC program

Command	Description
AUTO	Generate line numbers automatically
CHANGE	Replace all occurrences of a given string
DELETE	Delete lines from a program
DUMP	Display the values of all variables
EDIT	Use the EDIT set of function keys
FIND	Locate all occurrences of a given string
HELP	Indicate the location of an error
KEY	Display or assign a string to a function key
KILL	Disable all additional commands
MERGE	Load a program, combining it with the current one
OFF	Disable STEP or TRACE mode
PROG	Use the PROG set of function keys
RENUMBER	Change the line numbers of a program
STEP	Single step through the program displaying the line number
TRACE	Display the line number as a program is executed

Enhanced screen editor

The following key combinations can be used to modify the lines displayed on the screen

Keys	Description
Ctrl-A	Scroll up a program list
Ctrl-E	Cancel quote and insert modes
Ctrl-L	Erase characters after cursor on same line
Ctrl-N	Erase all characters in program after cursor
Ctrl-Q	Scroll down a program list
Ctrl-U	Erase all characters on cursor line