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sd-8516_user_s_guide [2026/02/21 10:16] – appledogsd-8516_user_s_guide [2026/02/21 10:20] (current) – appledog
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 Type this right now (press ENTER after the line): Type this right now (press ENTER after the line):
  
-    ? "HELLO WORLD"+<codify BASIC> 
 +? "HELLO WORLD" 
 +</codify>
  
 The computer should immediately display: The computer should immediately display:
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 Now try: Now try:
  
-    ? 42 + 8+<codify BASIC> 
 +? 42 + 8 
 +</codify>
  
 It prints 50. You can do math right away, no program needed. This is called **direct mode,** directly entering commands on the terminal. It prints 50. You can do math right away, no program needed. This is called **direct mode,** directly entering commands on the terminal.
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 Now carefully type these lines (press ENTER after each one): Now carefully type these lines (press ENTER after each one):
  
-    10 ? "HELLO WORLD" +<codify BASIC> 
-    20 GOTO 10+10 PRINT "HELLO WORLD" 
 +20 GOTO 10 
 +</codify>
  
 Type **RUN** and press ENTER. Type **RUN** and press ENTER.
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 You don't have to type lines in order, the computer will sort them for you automatically. Try this: You don't have to type lines in order, the computer will sort them for you automatically. Try this:
  
-    20 ? "LINE 20 COMES FIRST ANYWAY!" +<codify BASIC> 
-    10 ? "BUT LINE 10 RUNS FIRST"+20 ? "LINE 20 COMES FIRST ANYWAY!" 
 +10 ? "BUT LINE 10 RUNS FIRST" 
 +</codify>
  
 **RUN** **RUN**
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 Try this in direct mode: Try this in direct mode:
  
-    LET A = 25 +<codify BASIC> 
-     +LET A = 25 
-    ? A+ 
 +? A 
 +</codify>
  
 It prints 25. It prints 25.
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 Now a tiny counting program: Now a tiny counting program:
  
-    10 LET A = 1 +<codify BASIC> 
-    20 ? A +10 LET A = 1 
-    30 LET A = A + 1 +20 ? A 
-    40 IF A <= 10 THEN GOTO 20 +30 LET A = A + 1 
-    50 ? "BLAST OFF!"+40 IF A <= 10 THEN GOTO 20 
 +50 ? "BLAST OFF!" 
 +</codify>
  
 **RUN** **RUN**
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 Add these lines to make a simple checker: Add these lines to make a simple checker:
  
-    40 IF E = 42 THEN GOTO 70 +<codify BASIC> 
-    50 IF E <> 42 THEN ? "TRY AGAIN!" +40 IF E = 42 THEN GOTO 70 
-    60 GOTO 10 +50 IF E <> 42 THEN ? "TRY AGAIN!" 
-    70 PRINT "YOU FOUND THE ANSWER!"+60 GOTO 10 
 +70 PRINT "YOU FOUND THE ANSWER!" 
 +</codify>
  
 **RUN** and try a guess until you hit 42. (42 is a reference to the Hitchhiker's Guide -- a great book). **RUN** and try a guess until you hit 42. (42 is a reference to the Hitchhiker's Guide -- a great book).
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 Here is an example program: Here is an example program:
  
-    10 LET A = 5   +<codify BASIC> 
-    20 PRINT A   +10 LET A = 5   
-    30 LET A = A - 1   +20 PRINT A   
-    40 IF A > 0 THEN GOTO 20   +30 LET A = A - 1   
-    50 PRINT "GOAL!"+40 IF A > 0 THEN GOTO 20   
 +50 PRINT "GOAL!" 
 +</codify>
  
 Next, type **RUN.** You will see a countdowns to 1, then "GOAL!" Next, type **RUN.** You will see a countdowns to 1, then "GOAL!"
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 Here is an example of a GOSUB helper function: Here is an example of a GOSUB helper function:
  
-    10 REM GOSUB SQUARE DEMO +<codify BASIC> 
-    20 LET A = 2 +10 REM GOSUB SQUARE DEMO 
-    30 GOSUB 1000 +20 LET A = 2 
-    40 LET A = 3 +30 GOSUB 1000 
-    50 GOSUB 1000 +40 LET A = 3 
-    60 LET A = 4 +50 GOSUB 1000 
-    70 GOSUB 1000 +60 LET A = 4 
-    80 LET A = 5 +70 GOSUB 1000 
-    90 GOSUB 1000 +80 LET A = 5 
-    100 GOTO 9000 +90 GOSUB 1000 
-    9000 REM END+100 GOTO 9000 
 +9000 REM END
  
-    1000 REM THIS HELPER FUNCTION WILL PRINT THE SQUARE OF A +1000 REM THIS HELPER FUNCTION WILL PRINT THE SQUARE OF A 
-    1010 PRINT A * A +1010 PRINT A * A 
-    1020 RETURN+1020 RETURN 
 +</codify>
  
 After you enter this program and type RUN, you will see the result 4, 9, 16, 25. As you can see, every time the program calls **GOSUB 1000,*** it runs the code at LINE NO 1000 and then **RETURN**s to continue in the main program. After you enter this program and type RUN, you will see the result 4, 9, 16, 25. As you can see, every time the program calls **GOSUB 1000,*** it runs the code at LINE NO 1000 and then **RETURN**s to continue in the main program.
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 **NEW** then type: **NEW** then type:
  
-10 ? ""  +<codify BASIC> 
 +10 PRINT ""  
 20 GOSUB 900   : REM SHOW INSTRUCTIONS   20 GOSUB 900   : REM SHOW INSTRUCTIONS  
 30 A=1 : B=100   30 A=1 : B=100  
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 940 RETURN 940 RETURN
 5000 REM END 5000 REM END
 +</codify>
  
-Ty to **RUN** this program and play a few rounds! The subroutines make it modular. If you want fancier win/lose messages later, just edit those GOSUB lines.+Try to **RUN** this program and play a few rounds! The subroutines make it modular. If you want fancier win/lose messages later, just edit those GOSUB lines.
  
 **Negative Numbers in Action** **Negative Numbers in Action**
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 Since negatives are fully supported, try tweaking the game or make a countdown timer: Since negatives are fully supported, try tweaking the game or make a countdown timer:
  
 +<codify BASIC>
 10 PRINT "COUNTDOWN FROM ZERO..."   10 PRINT "COUNTDOWN FROM ZERO..."  
 20 LET A = 0   20 LET A = 0  
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 50 IF A >= - 10 THEN GOTO 30   50 IF A >= - 10 THEN GOTO 30  
 60 PRINT "BLAST OFF INTO NEGATIVE SPACE!" 60 PRINT "BLAST OFF INTO NEGATIVE SPACE!"
 +</codify>
  
 === WHILE, DO-WHILE, and FOR-NEXT Part I === WHILE, DO-WHILE, and FOR-NEXT Part I
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 Example: Countdown from 10 to 0, check at top. Example: Countdown from 10 to 0, check at top.
- 
  
 <codify BASIC> <codify BASIC>
sd-8516_user_s_guide.1771669014.txt.gz · Last modified: by appledog
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