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EXTENDED BASIC UNRAVELLED IIAPPENDIX DORIGIN:SPECTRAL ASSOCEXTENDED BASIC ROUTINES AND ENTRY POINTS REVISED:12/26/1999 WALTER K ZYDHEKregister down one graphic row. <strong>The</strong> number ofbytes per horizontal graphic row must be in HORBYT.A,X 92ED MOVE A PIXEL TO THE RIGHT (2 COLOR) - Adjust the Xregister and ACCA one pixel position to the right inthe 2 color mode. Enter with the absolute screenaddress in the X register and the pixel mask in ACCA.A,X 92F4 MOVE A PIXEL TO THE RIGHT (4 COLOR) - Adjust the Xregister and ACCA one pixel position to the right inthe 4 color mode. Enter with the absolute screenaddress in the X register and the pixel mask in ACCA.A,B,U 931D NORMALIZE COORDINATES - Adjust the horizontal andvertical coordinates for the current PMODE. Enterwith X,Y coordinates in HORBEG and VERBEG, thenormalized coordinates will be returned in the same.A,B 9377 TURN ON A PIXEL - Turn on the pixel which isbeing pointed to by the X register (absolutescreen address) and ACCA (pixel mask) to the colorin ALLCOL. Set CHGFLG 0 if pixel color wasunchanged by the action.ALL 9408 DRAW A BOX - Encloses a diagonal line with a box(box function of LINE). Enter with the start andend coordinates of the original line in HORBEG,VERBEG, HOREND and VEREND.ALL 9434 FILL BOX - Draw a series of horizontal linesfrom BERBEG to VERENDALL 9444 DRAW A HORIZONTAL LINE - Draw a horizontal line fromHOREND to HORBEG at the vertical coordinate VERBEGwith the color in ALLCOL.ALL 946E DRAW A VERTICAL LINE - Draw a vertical line fromVEREND to VERBEG at the horizontal coordinateHORBEG with the color in ALLCOL.B,U 9494 POINT TO PIXEL MOVE ROUTINE - Point the U registerto the routine which will move the current pixelto the right one position for the current PMODE.ALL 94A1 DRAW A LINE - Draw a line from (HORBEG,VERBEG) to(HOREND, VEREND).X 9506 INCREMENT HORIZONTAL POSITION - Gets the currenthorizontal coordinate (HORBEG) and moves it oneto the right.D2
EXTENDED BASIC UNRAVELLED IIAPPENDIX DORIGIN:SPECTRAL ASSOCEXTENDED BASIC ROUTINES AND ENTRY POINTS REVISED:12/26/1999 WALTER K ZYDHEKX 950D INCREMENT VERTICAL POSITION - Gets the currentvertical coordinate (VERBEG) and moves it one down.X 9515 DECREMENT HORIZONTAL POSITION - Gets the currenthorizontal coordinate (HORBEG) and moves it oneto the left.X 951B DECREMENT VERTICAL POSITION - Gets the currentvertical coordinate (VERBEG) and moves it one up.A,B,X,U 9522 GET MAXIMUM COORDINATES - Get the maximum valuesof the horizontal and vertical coordinates for thecurrent PMODE. Return HOR in VD3 and VER in VD5.A,B,X 9536 CLEAR GRAPHIC SCREEN - Clear the current graphicsscreen to the color in ACCB. If ACCB = 0 thenclear to the current background color.A,B 9710 CALCULATE ABS(VEREND-VERBEG) - Calculate theabsolute value of the distance between VERENDand VERBEG. Carry flag will indicate which wasthe larger coordinate.A,B 971D CALCULATE ABS(HOREND-HORBEG) - Calculate theabsolute value of the distance between HORENDand HORBEG. Carry flag will indicate which wasthe larger coordinate.U,Y 9FB5 16 BIT MULTIPLY - Multiply (unsigned) two 16 bitnumbers together. Enter with one number in ACCDand the other in the X register. <strong>The</strong> four byteproduct will be returned in the Y and U registers.D3
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TABLE OF CONTENTS1 FOREWORD……
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EXTENDED BASIC UNRAVELLED II INTROD
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EXTENDED BASIC UNRAVELLED II DESCRI
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EXTENDED BASIC UNRAVELLED IIAPPENDI
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