Alt S Alt S The command stops and starts video output only. This may be used to slow output to a readable rate, assuming your reflexes are excellent. The flashing video cursor changes to an underline to indicate that output is suspended. Alt Ctrl C This is a powerful way to abort or escape from a program in foreground. It will escape from or abort the vast majority of programs. Use to reset, if this fails. Alt Ctrl R Toggles the end of file (EOF) character. Default is $100 (that is, no end of file character), and the alternate value is $04 (or Ctrl D). See the option command to set EOF to any desired value.
This EOF character is often used to indicate the end of input from devices such as the keyboard, or from other com- puters. Alt Del Function keys The 1616 keyboard’s ten function keys to may be used to produce up to 63 characters of input from a single keystroke. The fkey command may be used to define a function key from within a .shell program, as explained in a later section. F1 F10 There is a manual capture mode on function keys: You hold down the and and press the function key. From this point all characters typed are invisibly capturedinto the definition for that functionkey. The definition may be terminated by pressing the function key which is being defined.
This feature is handy for ‘remembering’ a sequence of editor commands which needs to be repeatedly typed. If you find yourself repeatedly typing any lengthy group of commands, capture them on a function key, and use that instead. The captured function keys are lost when you switch off the system, and you would have to retype them. The fkey command is provided so you can save function key definitions on disk. Alt Ctrl Last line recall and completion The up-arrow and down-arrow keys (or and ) scroll up and down singly through the last ten lines which have been entered in the line editor. Once you have found the line you wish, you can change it with the line editor.
Ctrl E Ctrl X As an additional feature, you can type the first few letters of a previous command, and then press the key. The most recent command starting with those letters will be displayed ready for editing. Pressing the key again will bring up the next most recent command starting with the letters you typed. This applies by default to the last ten commands issued. You can change the number of command lines retained by altering your mrdrivers file, as explained in the documents for the mrdrivers ( Technical Reference Manual or Users Disk Manual ). Esc Esc Page 18 User Tutorial Manual First Steps