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By Linda M. Schreiber

Publication via Schreiber, Linda M.

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Extra resources for Advanced programming techniques for your Atari including graphics and voice programs

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Graphics mode 5 uses 20 bytes in each row, and graphics mode 7 uses 40. Because of the way that the AT ARI stores the color information, only three colors plus a background color can be displayed in these modes. If the computer used 4 bits per byte to display color, we could have 16 colors on the screen. Of course, the computer would need twice as much memory for the screen display. The number of pixel rows per graphic row wi ll depend on which mode we have chosen. Graphics mode 3 is 8 pixels high, Graphics mode 5 is 4, and graphics mode 7 is 2.

The other characters that we just transferred do not. If we moved the comma the same way that we moved the other characters, the character would be distorted on the screen when it was printed because the data that it needs for the last row would be in the first row. 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).

740 GOTO 210 750 LOCATE XvC,C2:IF C2)128 THEN CH~20 :C2=C2-128:CV(X-16,C-6)~0:GOTO 770 760 CH=160:C2=C2t128:CV(X-16,C-6)=1 770 POSITION X,C:? CHR'(C2):GOTO 210 800 POSITION 3,16:? "EDIT FINISHED ":REM CHANGE MESSAGE 810 CV=0:B~128:FOR Q=O TO 7:FOR Q1=O T o 7:REM CONVERT THE 1 & O'S TO DECIMAL 820 IF CV(Q1,Q)=1 THEN CV=CVtB 830 B=B/2:NEXT Q1:REM REDUCE B FOR EAC H POSITION 840 POKE CPtQvCV:REM CHANGE THE BYTE I N THE CHARACTER SET 850 CV=O:B=128:REM RESET THE VARIABLES FOR NEXT BYTE 860 NEXT Q:REM FINISH THE CHARATER 870 CP=NCB:POSITION 11,10:?

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