Commodore PET - CASSETTE TAPE CONTROLS

A RETURN given anywhere on the last line of the sereen causes ail of
the sereen text to move. or seroll. up one line. The top line rolls up off the
screen and a blank line rolls
into the bottom line of the screen, with the cursor left
at the beginning of the blank line.
Before RETURN
Line
1 10 ?"Hm'J I::; THE TH1E"
2 20 ?"FOF; ALL GOOD F'EOF'LE"
30 RE AD ;':2
24 90 A=B+C-D
25 100 IF A~1 GOTt' 10.',
Cursor
After RETURN
90 A=B+C-D
100 IF A=l GüT0 10
Cursor
PI br). Pi b) is a circle's circumference divided by its diameter. 1T has its
own key on the PET computer. When this symbol is used, alone or in an expres-
sion,
PET replaces it with the value 3.14159265.
. 4159265
The only time 1T is not evaluated as its preassigned number is when it ap-
pears within quotation marks. Then it is treated as a graphie character - a part of
a string.
fT
REVERSE ON/OFF. The Reverse key allows you to reverse the black
and
white parts of eharaeters; REVERSE is like a photograph and its nega-
tive. The normal mode of this key
is "off." To activate the REVERSE key. press it in
unshifted mode. The next character keys vou press will be displayed in reverse
field.
REVERSE ON stays in effect until vou either press REVERSE OFF (the
REVERSE key shifted) or press the RETURN key.
ABC;l:IIIiFIE:C
RVS ON ~ t RVS OFF
?~
4
Note: Reverse field terminated
by carriage return
23