Atari 65XE Owner's Manual

and Mathematical Functions: RND, +,-, *,/ Initially computers were developed to process numbers quickly and easily. To take advantage of the computer's ability to calculate a math answer in a few milliseconds, you must know how to speak to a computer. NUMBERS Type the statement below and press : PRINT 10 The computer should print the number 10. Make sure you use the numerals 1 and 0, not letters. Practice printing the following numbers: PRINT 1000000000 PRINT -100000000 Use the minus sign (-) on the Up Arrow key to indicate negative numbers. Do not use commas in numbers. T ...

values as those in ASCII, but some of the special characters are different. 2. Except as shown, the characters from 128 to 255 are the reverse colors of 1 to 127. 3. Add 32 to the uppercase code to get the lowercase code for the same letter. 4. To get the ATASCII code, tell the computer (direct mode) to PRINT ASC (" "). Fill the blank with a letter or a character. You must use the quotes! 5. The normal display keycaps are shown as white symbols on a black back- ground; the inverse keycap symbols are shown as black symb ...

Decimal Code 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 Hexadecimal Code 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B ATASCII Character 103 Keystrokes / 0 1 2 3 4 5 6 7 8 9 Shift ; < > Shift / Shift 8 A B C D E F G H I J K European Character ...

the next line and prints CONGRATULATIONS!, it moves to the next tab position. The result is a barber-pole effect. Remember to break the loop with the key. Semicolon: Computer Glue A semicolon produces another kind of effect. List the program, change the comma in line 110 to a semicolon, press , and run the program: LIST 110 PRINT "CONGRATULATIONS! "; 120 GOTO 110 RUN The semicolon glues the PRINT statements together with no space in between. To put some space between the words, go back and edit line 110 so that it looks like this: ...

This program uses a technique called Player Missile Graphics to create a pink monster that moves across your screen in front of a blue vertical bar. If you want to make the monster scoot behind the blue bar, simply change line 150 to 150 POKE 623,4. 10 POKE 764,255:POKE 580,1 20 GRAPHICS 3+16 30 FOR X=16 TO 24 : FOR Y=0 TO 23 : COLOR 3 : PLOT X, Y : NEXT Y:NEXT X 40 MEMTOP=PEEK(741)+256*PEEK(742)-1 50 PMBASE=INT((MEMTOP-1024) /1024)*1024 60 ADJTOP=PMBASE+384 70 POKE 742,INT (ADJTOP/256) : POKE 741,ADJTOP-256*PEEK(742) 80 POKE 54279,PMBASE/256 90 POKE 53277,2 100 POKE 559,3 ...