Commodore Plus 4 - Page 80

68 The BASIC Language
POKE Abbr. pO
POKE memory location, number
Places a single value directly into a specific RAM location, such as each
position in the screen memory. Unless you are an advanced programmer, you are
unlikely to use this command.
Parameters: memory location, value
1. Names the specific address of a memory location or input/output register.
The possible values are 0 to 65535. You can find specific addresses on the memory
map in Appendix G.
2. Gives the number (0-255) for the value you want to place in the memory
location. See the screen display chart in Appendix E for values that can be poked
to screen locations. These values are not the same as CHR$ values.
Example: 10 SCNCLR
15 REM 3079 IS COL 7 OP ROW 1 ON SCREEN; 4071 IS BOTTOM
RIGHT CORNER
20 FOR X=3079 TO 4071 STEP 41
30 POKE X,0
25 REM PRINT AKT @ SIGN AT 41-SPACE INTERVALS
40 NEXTX
50 FOR Y=3103 TO 4071 STEP 39
55 REM PRINT AN @ SIGN AT 39-SPACE INTERVALS
60 POKE Y,0
70 NEXTY
POS Abbr. none
POS (number)
Finds the column in which the cursor currently resides. This is the column in
which the next item will be displayed by a PRINT command. The column
number is between 0 and 39. The number in parentheses is a dummy argument,
which means it does not mean anything. It is nonetheless required, and you
should just use POS(O). You can also find the column by using PEEK(202) and
the row by using PEEK(205).
PRINT Abbr. ?
PRINT output list
Displays the following types of information on the screen:
• Text entered in quotes
• Solutions to calculations