By Linda M. Schreiber
Publication through Schreiber, Linda M.
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Extra info for Advanced programming techniques for your Atari including graphics and voice programs
The 13th through 26th characters will move down one scan line when they are moved. What we are doing in these lines is lowering all the characters one scan line so that the lower case characters that use the second byte for data will not be distorted on the screen (l,j,k,d,b,f,i,t). The characters that use the 8th byte for data, the graphic characters, the comma , and the semicolon are moved into RAM exactly the way they appear in ROM. Lines 270-330 move the data that is in the first byte for these letters into the second byte and repeat the data from the eighth byte into the first byte.
It can be changed to store the characters to cassette by opening the cassette instead of the disk. You do not need a name for the file if you are using a cassette. Line 240 will end the program when a control-Q is pressed. Before ending, the program will restore the ROM character set, restore the cursor, and clear the screen. Whenever an alternate character set is used in a program, it is good programming practice to reset the pointer to the ROM character set. Loading a new program with an alternate character set could confuse the next user.
The character that is stored in CH is printed in the grid where the asteri sk is. If we are moving the asterisk to the right (line 650), the variable X is incremented. If we are moving it to the left (line 670), X is decre mented. Moving the asterisk up (line 690) decrements C and moving it down (line 710) increments C. After the variable X or C is changed, the program checks it to make sure that it is not beyond the grid area. If it is, the variable is reset to the other side of the grid, giving it a wrap-around feature.