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Portable Network Graphic  |  1997-07-26  |  132KB  |  816x1056  |  8-bit (256 colors)
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OCR: STAFRT 0F J9NE TO Beginners Guide To Macintosh Assembly LanguHie ENDOITHE NEXT 7Rage LINE MULU #DIST,D7 SCREENROW SCROLL STEP SUB.I D7,A0 A0 LASTPIXEL OF SOURCE LINE *NOW CALCUL ATE THE NUMBER OF LINES TO SCROLI MOVE. NUMB OF LINES(A6),D2CALCULATE NUMBER OF EXT.I D2 LINES TO SCROLI SUB.L #DIST+1,D2 DISTPLUS FOR DBRA **NOW SCROLI THE ENTIRE SCREEN SCROLL: MOVE.I D5 D4 LINE LENGTH IN BYTES 1 LSR #2 D4 DIVIDED BY 4 FOR LONGS SUBQ.L #1,D4 COPV LINE MOVE.L A0),-(A1) MOVE THE SOURCE LINE TO DESTINATION DBRA D4. COPY LINE UNTIL ALLLONGS HAVE BEEN MOVED SUB D3, A0 SUB. D3 A1 POINT TO NEXTLINE DBRA D2 'SCROLL NOW MOVE THIS LINE UNTIL ALL ARE MOVED MOVEM.I (SP)+, D2-D7/A0-Al RESTORE REGS RTS The subroutine scroll down is the core of the program. It will scroll the whole screen down by the number of ...