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SHIFTING EXERCISE.bas
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BASIC Source File
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2023-02-26
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561b
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13 lines
5 REM REQUIRES BLOCK ROUTINES $911A AND BLOCK SHAPE #144
10 HGR : CALL 37799: POKE 251,144
20 POKE 252,10: POKE 253,21: POKE 254,2: POKE 255,0: CALL 37679
30 CALL 37298: REM INCREMENT HR-ADD EMPTY BYTE COLUMN RIGHT
50 FOR X = 0 TO 35
60 FOR Y = 1 TO 7: CALL 37390: NEXT : REM SHIFT THROUGH 1 BYTE/RIGHT
70 CALL 37296: REM INCREMENT HR/HL
80 NEXT : CALL 37281: REM SHIFT EMPTY COLUMN AHEAD/LEFT
100 FOR X = 0 TO 35
110 FOR Y = 1 TO 7: CALL 37301: NEXT : REM SHIFT THROUGH 1 BYTE/LEFT
120 CALL 37281: REM DECREMENT HR/HL
130 NEXT X
140 GOTO 50