By Carl M. Evans
Atari Basic-Faster and Better
Atari details sequence quantity 1
Carl M. Evans
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Extra resources for Atari BASIC faster and better
You will find that with a little study you can replace whole blocks of IF -THEN statements with a few logical expressions. 16. Use X*RND(O) rather than RND(O)*X - I'm still not sure why this one works, but experience has shown that it does save time. The same holds true for X*COS(Y) and the rest of the special functions. Minimizing the Size of a Program You will often find that you are hard pressed between two desires that usually conflict with one another. You would like to have your program run as fast as possible and yet use up as little memory as possible.
00000000*0 VARIABLE NUMBER = 6 VARIABLE NAME = MONTHS( ARRAY DIMENSIONED FIRST DIMENSION= 12 SECOND DIMENSION= 0 VARIABLE NUMBER = 7 VARIABLE NAME = NAME$ STRING DIMENSIONED MAXIMUM LENGTH = 19 CURRENT LENGTH = 11 END OF VARIABLE NAME AND VALUE TABLES. LST: 1. LOAD the program that you want to analyze. 2. LST". LST. 3. RUN your program to initialize the variables, then simply execute a GOSUB 19940. ATARI BASIC Faster & Better 57 4. A short menu will come up asking you to press the START botton for output to the screen or SELECT for output to a printer.
Each subroutine will be listed in assembly code as well as the USR format. When you are ready to take the plunge into programming your own 6502 routines (if you haven't already), the listings will provide you with a good starting place. You can use an assembler/ editor program to combine or modify any of the routines in this book. Most of the USR routines in this book have one very important characteristic - they are relocatable, so you can load and execute them at any location in available RAM.