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BASIC Week 3: Under the Sea
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In here you will find the BASIC program for a contest used on http://reddit.com/r/RetroBattlestations. The program was intended to be reusable and reasonably portable to many different BASIC flavors. The "graphics" are character based and have some simple sprites. It should be portable to any BASIC that has the ability to position the cursor at a specific location. This time around instead of just being a picture or an animation, it's a game! You take control of a sea turtle in a sort of endless runner type game. The turtle constantly swims from left to right and the A & Z keys move the turtle up & down. You need to eat food (x/y characters in most versions) for points. Running into enemies will cost you air. You can refill your air by catching air bubbles, or you can surface to refill completely. When you run out of air it's game over and the turtle goes belly up. === Typing Tips === When typing the program in you can leave off any lines which begin with REM, they are not needed for the program to run. On many platforms you can leave out the whitespace between keywords and operators. IBM BASIC is not one of those however. Note: On the TRS-80 Color Computer and BBC Micro you need to include the spaces around any IF, AND, OR, or THEN statement. If you make a mistake and don't want to retype the entire line, most of the BASICs have a way to make corrections. Apple II computers: On an Apple II+ use LIST <line number> to print the line with an error, then use ESC followed by A/B/C/D to move the cursor one step at a time. Position the cursor at the beginning of the line, then use the right arrow to move over the line and fix the error. Be sure to arrow all the way to the end of the entire line before you hit RETURN! On an enhanced Apple IIe, Apple IIc, or Apple IIgs you can also use ESC with the arrow keys. In 80 column mode (enter with PR#3) the cursor will change to a white block with a + in it, push ESC to drop out of movement mode. BBC Micro: Use LIST <line number> to print the line with a mistake, then use the arrow keys to move up to the beginning of the line. Each press of the copy key will type in the character under the cursor. Make any necessary edits by just typing on the keyboard and using copy to avoid retyping everything. Commodore 64, Plus/4, and 128: Like the others, use LIST <line number> to display the line with problems, then use the arrow keys to move up and make any corrections. By pressing shift-INST you can insert a blank character if you missed something. Unlike the Apple II you don't need to arrow to the end of the line before pushing RETURN. TRS-80 model 100: This has to be the best built-in BASIC editor I've seen so far! Just type EDIT and the entire BASIC program will be loaded into the built-in word processor where you can make any changes you want. Press F8 to exit the editor and go back to BASIC. IBM Cassette BASIC, Disk BASIC, Advanced BASIC, GW-BASIC: Type EDIT <line number> and it will print the line on the screen and put your cursor at the beginning of the line. Arrow left/right and you can use Insert & Delete to make corrections. Like Commodore BASIC, you don't need to arrow to the end of the line before pushing RETURN. TI-99/4A Extended BASIC Type the line number and then arrow up (FCTN+E) and it will enter edit mode with that line loaded. You can move within the line with arrow left (FCTN+S) and arrow right (FCTN+D) and move to the previous or next line with arrow up (FCTN+E) or arrow down (FCTN+X). You can delete the character under the cursor with DEL (FCTN+1) or turn on insert mode to insert extra characters with INS (FCTN+2). You do not need to move to the end of the line before pressing ENTER.