94 lines
2.3 KiB
Plaintext
94 lines
2.3 KiB
Plaintext
;------------
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;MFF0DRVR.SC4 - KARAOKE SCAN AHEAD LOGIC
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;------------
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; THIS LOGIC IS CALLED WHENEVER A CARRIAGE RETURN ($0D) IS FOUND.
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; IT WILL SCAN AHEAD IN THE BUFFER TO FIND THE NEXT CARRIAGE RETURN
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; BY LOOKING FOR TEXT META EVENTS. IT WILL PRINT UP TO 79 CHARACTERS.
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; IT WILL EXIT WHEN EITHER A NEW CARRIAGE RETURN IS FOUND, 79 CHARACTERS
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; HAVE BEEN PRINTED, THE END OF TRACK MARKER (FF 2F) IS FOUND, OR THE
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; POINTER REACHES THE END OF THE CURRENT BUFFER.
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;
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MYPTR EQU $08
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MYXCOORD DFB $00
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MYENDFLG DFB $00
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MYBYTE DFB $00
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MYLENGTH DFB $00
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MYSTOP DFB $00
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;
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KARASCAN LDA PLAYPTR ;SET OUR POINTER TO CURRENT POSITION
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STA MYPTR
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LDA PLAYPTR+1
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STA MYPTR+1
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LDA #$00
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STA MYXCOORD
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STA MYENDFLG
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LDA PLAYSTOP+1
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STA MYSTOP
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KARALOOP LDY #$00
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LDA (MYPTR),Y
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CMP #$FF
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BEQ FOUNDFF
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KARALOO1 JSR INCMYPT
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LDA MYENDFLG
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BEQ KARALOOP
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KARADONE LDA #$8D ;PRINT CR
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JSR COUT
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RTS
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;
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FOUNDFF JSR INCMYPT
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LDA MYENDFLG
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BNE KARADONE
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LDA MYBYTE
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CMP #$2F
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BEQ KARADONE
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CMP #$10
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BCS KARALOO1 ;NOT TEXT EVENT
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JSR INCMYPT
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LDA MYENDFLG
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BNE KARADONE
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LDA MYBYTE
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BMI KARALOO1 ;DON'T SUPPORT META > 127 CHARS-LOOK FOR MORE
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BEQ KARALOO1 ;TEXT LEN OF 0
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STA MYLENGTH
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PRLOOP JSR INCMYPT
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LDA MYENDFLG
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BNE KARADONE
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JSR PRINT24 ;PRINT THE CHAR
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LDA MYENDFLG
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BNE KARADONE
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DEC MYLENGTH
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LDA MYLENGTH
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BNE PRLOOP
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BEQ KARALOO1
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;
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INCMYPT INC MYPTR
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BNE INCMYP2
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INC MYPTR+1
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LDA MYPTR+1
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CMP MYSTOP
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BCC INCMYP2
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INC MYENDFLG
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RTS
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INCMYP2 LDY #$00
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LDA (MYPTR),Y
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STA MYBYTE
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RTS
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;
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PRINT24 LDY #23
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LDX MYXCOORD
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LDA MYBYTE
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CMP #$0D
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BEQ SETEND
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CMP #$20 ;DON'T PRINT CONTROL CHARS
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BCC PRINT24A
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ORA #$80
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JSR COUT
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INX
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STX MYXCOORD
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CPX #79
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BNE PRINT24A
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SETEND INC MYENDFLG
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PRINT24A RTS
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;
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CHN MFF0DRVR.SC5
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