SYSTEM X uses external commands which are identified by the | ( vertical bar ) which precedes the name. This is achieved by pressing SHIFT and the @ key. The name can be in lower or upper case and is converted to upper case within a BASIC listing. COMMANDS |CAPOFF No Parameters This will turn off the CAPS LOCK within a program. All character read from the keyboard will be in lower case. |CAPON No Parameters This will turn on the CAPS LOCK within a program. All characters read from the keyboard will be in upper case.þ+ |CIRCLE One or two parameters This will draw a circle with the centre of the circle at the current position of the graphics cursor. The command is followed by the radius of the circle and is drawn using the current graphics pen. Ovals can also be drawn with this command by adding a second parameter. In this case the first parameter refers to the horizontal radius and the second parameter refers to the vertical radius. |CUROFF No Parameters This will turn the text cursor off |CURON No Parameters This will allow the text cursor to be displayed on the screen. |DEPRO No Parameters BASIC programs saved with the P option cannot be listed. With this command you can turn off the protection from within the program. |DPEEK Two Parameters This is a double peek. It will return the result of the contents of two consecutive memory locations in RAM. |DPOKE Two Parameters This is a double poke. It will put a signed 16 bit number into two consecutive memory locations in RAM. |DSCREEN No Parameters The whole screen will be moved down one line using this commandþ |FILL One Parameter This will fill any shape area with the specified pen colour. It will fill an area up to a line which is drawn in the current graphics pen or to a line drawn in the pen being used to fill. |FLUSH No Parameters This is used to clear the input buffer to prevent a build up of characters. |FRAME No Parameters Smooth movement of characters on the screen can be achieved by using the command. It will wait for a frame flyback pulse before continuing. |GETCHAR One Parameter This will read from the screen at the current text cursor position. |GETKEY One Parameter This will stop the program and wait for a key press. The character assigned to that key will be returned in a string. |GPEN One Parameter This will change the graphics pen. |GOVER One Parameter This will turn on or off the graphics XOR mode to enable you to rub out line setc. A parameter of 1 will turn it on and a parameter of 0 will turn it off. |HELP |XHELP No Parameters This will print all the new commands available from SYSTEM X. |INVIS No Parameters This will make the screen invisible. |INVERSE No Parameters Pen and paper colours are swapped with this command. |LSCREEN No Parameters This will move the whole screen left. |MOTOR One Parameter This will operate or release the relay which controls the cassette motor. A parameter of 1 will turn it on and a parameter of 0 will turn it off. |PROFF No Parameters This will turn off the printer function. |PRON No Parameters Issuing this command will cause all character printing to the screen to be echoed onto the printer. |PROTEC No Parameters With this command it is possible to protect a BASIC program from within that program so that it will destroy itself upon return to the direct command mode. |RPEEK Three Parameters This command allows you to peek into any ROM. The result of the peek is returned into an integer variable. |R |RESET No Parameters This will reset the screen to the default mode, inks, border, pen and paper. |R is a shorthand version of |RESET which is easier to use if you cannot see what you are typing. |RSCREEN No Parameters This will move the whole screen right. |SHIFT Three Parameters A Block of memory can be moved with this command. |USCREEN No Parameters The whole screen will be moved up one line using this command. |VIS No Parameters This will make the screen visible after using the |INVIS command. |ZIP One parameter This is similar to SPEED WRITE except that it offers seven speeds instead of two. These are: |ZIP,0 1000 baud |ZIP,1 1500 baud |ZIP,2 2000 baud |ZIP,3 2500 baud |ZIP,4 3000 baud |ZIP,5 3500 baud |ZIP,6 4000 baud