the Monitor

Fast-Run Button
When fast-run is used, the program's own display is used and the program is run at full speed. If an error is not found, the only way to return to the Monitor during a fast-run is to press [Ctrl]+[C], or use break points.

Break Point Button
Click on the break point button with the left mouse button as usual, then click on the instruction in the program listing wherever you wish to set the break. The instruction will be highlighted in inverse video. To remove a break point, click on an area which is adjacent to the highlighted listing, such as the area without any commands or text to the right of the program lines.

Evaluation Button
The button marked [VAL] allows you to use a very accurate setting for the evaluation process. Click on the button and then use the mouse to set the individual character that marks the beginning of the expression to be evaluated. With the button held down, drag it to the character in the listing to mark the end of the expression you are interested in, and release the button to underline the expression. The evaluation will now be reported in the Information Window.

Help Button
Click on the help button [?], then click on the instruction you need help with. The keyword will be underlined, and the trusty AMOS Professional Help Window will appear, at your service.

Quit
This button takes you back to the Editor. If the Monitor system has been called up from inside a program using the MONITOR command, you will be returned to the program at the instruction immediately after that command.

Evaluating expressions
The Monitor may be simple to use, but it is incredibly skilful in the way it analyses expressions, and reports the results back to you. here are the ground rules for a simple demonstration. First, run this example to give yourself something to work on, and then call up the Monitor.

E> A=1 : B=2 : C=3
   D=A+B*C-1
   Print D

Initialise the program by clicking on the [INIT] button. If you were to press [VAL] and ask for an evaluation of A+B without first initialising B, you would be asking for the impossible. Also, if you asked for an evaluation of "k", you would be told that it is not possible to evaluate something that is plainly idiotic! On the other hand, if you ask for an evaluation of something self evident, like "1", it will be given. Also, the expression must be at the same level of procedure as the program pointer.