Extended Commands gives 12 new functions controlled by 27 new command words. Please note that the AUTO-REPEAT, CLOCK and the character FLASH functions are all interrupt-driven. This means that during cassette operations the clock will stop. Also this tape is not compatible with a disk-based system.

All the new functions of Extended Commands may be used from within a Basic program and, with the exception of the error-trapping function, all may be used in the command mode.

In the examples given X is used as a dummy variable. This dummy variable may be any of the normally allowed combinations of characters that would be used as variables.

In the command mode only single statement lines are allowed.

Allows printing to the text screen in either green or orange on black.

Gives full auto-repeat on all character keys.

Allows full error trapping from within a Basic program.

  10 X=%TRAP1000
  20 REM rest of program
1000 REM program jumps here if error occurs
1010 PRINT %ERR
1020 PRINT %ERL
1030 END

%ERR gives the error number.
%ERL gives the line number that the error occured in.

The main advantage of error trapping is that an error need no longer cause a program to crash. Instead the program may deal with the error and then continue.

X = %MERGE

Allows a Basic program from tape to be "added" to a program in memory. The line numbers of the second program must be greater than the last line number of the program in memory.

Flashes any selected on-screen character.

Gives an on-screen real time display.

CLEAR 200,31000 (ENTER)
CLOADM (ENTER)