Commodore Plus 4 - Page 202

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CHR$
18
146
130
132
8
9
14
142
17
145
29
157
19
147
mm mm wgy— ••' 0 — mW
Keys
CONTROL 9
CONTROL 0
CONTROL,
CONTROL.
CONTROL H
CONTROL I
CONTROL N
Reverse SHIFT N
Cursor Down
Cursor Up
Cursor Right
Cursor Left
HOME
SHIFT HOME
Function
Turns on reverse printing.
Turns off reverse printing.
Turns on flashing.
Turns off flashing.
Disables G SHIFT.
Enables gg SHIFT.
Switches (whole screen) to upper/lower case.
Switches (whole screen) to upper case/graphics.
Moves down one line.
Moves up one line.
Moves one space to the right.
Moves one space to the left.
Moves to top left of screen.
Clears screen and moves to top left of screen.
Again, if you press the designated keys in the quote mode, these functions
occur when the string is printed. The reverse SHIFT N cannot be entered directly
into a string. You must type in the string leaving blanks where it is to go. Then,
when you are out of the quote mode, cursor back to those blanks, get into reverse
printing (Control 9) and type in the SHIFT N. You can also include the CHR$
code to perform the function when the string is printed.
The PRINT (or PRINT USING) statement may be used to place text on the
screen wherever the cursor is. When PRINT or PRINT USING is used, you can
control the position on the screen by placing the cursor where you want the text to
be.
Generally, you must start by printing a CLEAR/HOME character
(CHR$(147)), so that the cursor always begins in the upper left corner of the
screen, and then using cursor control characters to reach the desired position.
The CHAR statement may also be used to place text on the screen. You may
still want to clear the screen using CLEAR/HOME, but you do not need to be
concerned with cursor positioning. The CHAR statement requires designating an
x-coordinate and y-coordinate for the placement of the text. The following
example program illustrates the use of some of these capabilities.
Text Mode Example Program
10 C0L0R0,S,5:C0L0R4,5,4:C0L0Rl,7,5
20 PRINTED [QQQQQQQQ"
30 PRINTSPC(14)//I]SrTR0DUCIMG//
40 PRINTSPC(14)"Y0UR "lC
50 C0L0Rl,16,l