Apple II User Manual
FCB3: 60 705 RTS
FCB4: E6 42 706 NXTA4 INC A4L ;INCR 2-BYTE A4
FCB6: D0 02 707 BNE NXTA1 ; AND A1
FCB6: D0 02 707 BNE NXTA1 ; AND A1
FCB8: E6 43 708 INC A4H
FCBA: A5 3C 709 NXTA1 LDA A1L ;INCR 2-BYTE A1.
FCBA: A5 3C 709 NXTA1 LDA A1L ;INCR 2-BYTE A1.
FCBC: C5 3E 710 CMP A2L
FCBE: A5 3D 711 LDA A1H ; AND COMPARE TO A2
FCBE: A5 3D 711 LDA A1H ; AND COMPARE TO A2
FCC0: E5 3F 712 SBC A2H
FCC2: E6 3C 713 INC A1L ; (CARRY SET IF >=)
FCC2: E6 3C 713 INC A1L ; (CARRY SET IF >=)
FCC4: D0 02 714 BNE RTS4B
FCC6: E6 3D 715 INC A1H
FCC6: E6 3D 715 INC A1H
FCC8: 60 716 RTS4B RTS
FCC9: A0 4B 717 HEADR LDY #$4B ;WRITE A*256 'LONG 1'
FCC9: A0 4B 717 HEADR LDY #$4B ;WRITE A*256 'LONG 1'
FCCB: 20 DB FC 718 JSR ZERDLY ; HALF CYCLES
FCCE: D0 F9 719 BNE HEADR ; (650 USEC EACH)
FCCE: D0 F9 719 BNE HEADR ; (650 USEC EACH)
FCD0: 69 FE 720 ADC #$FE
FCD2: B0 F5 721 BCS HEADR ;THEN A 'SHORT 0'
FCD2: B0 F5 721 BCS HEADR ;THEN A 'SHORT 0'
FCD4: A0 21 722 LDY #$21 ; (400 USEC)
FCD6: 20 DB FC 723 WRBIT JSR ZERDLY ;WRITE TWO HALF CYCLES
FCD6: 20 DB FC 723 WRBIT JSR ZERDLY ;WRITE TWO HALF CYCLES
FCD9: C8 724 INY ; OF 250 USEC ('0')
FCDA: C8 725 INY ; OR 500 USEC ('0')
FCDA: C8 725 INY ; OR 500 USEC ('0')
FCDB: 88 726 ZERDLY DEY
FCDC: D0 FD 727 BNE ZERDLY
FCDC: D0 FD 727 BNE ZERDLY
FCDE: 90 05 728 BCC WRTAPE ;Y IS COUNT FOR
FCE0: A0 32 729 LDY #$32 ; TIMING LOOP
FCE0: A0 32 729 LDY #$32 ; TIMING LOOP
FCE2: 88 730 ONEDLY DEY
FCE3: D0 FD 731 BNE ONEDLY
FCE3: D0 FD 731 BNE ONEDLY
FCE5: AC 20 C0 732 WRTAPE LDY TAPEOUT
FCE8: A0 2C 733 LDY #$2C
FCE8: A0 2C 733 LDY #$2C
FCEA: CA 734 DEX
FCEB: 60 735 RTS
FCEB: 60 735 RTS
FCEC: A2 08 736 RDBYTE LDX #$08 ;8 BITS TO READ
FCEE: 48 737 RDBYT2 PHA ;READ TWO TRANSITIONS
FCEE: 48 737 RDBYT2 PHA ;READ TWO TRANSITIONS
FCEF: 20 FA FC 738 JSR RD2BIT ; (FIND EDGE)
FCF2: 68 739 PLA
FCF2: 68 739 PLA
FCF3: 2A 740 ROL ;NEXT BIT
FCF4: A0 3A 741 LDY #$3A ;COUNT FOR SAMPLES
FCF4: A0 3A 741 LDY #$3A ;COUNT FOR SAMPLES
FCF6: CA 742 DEX
FCF7: D0 F5 743 BNE RDBYT2
FCF7: D0 F5 743 BNE RDBYT2
FCF9: 60 744 RTS
FCFA: 20 FD FC 745 RD2BIT JSR RDBIT
FCFA: 20 FD FC 745 RD2BIT JSR RDBIT
FCFD: 88 746 RDBIT DEY ;DECR Y UNTIL
FCFE: AD 60 C0 747 LDA TAPEIN ; TAPE TRANSITION
FCFE: AD 60 C0 747 LDA TAPEIN ; TAPE TRANSITION
FD01: 45 2F 748 EOR LASTIN
FD03: 10 F8 749 BPL RDBIT
FD03: 10 F8 749 BPL RDBIT
FD05: 45 2F 750 EOR LASTIN
FD07: 85 2F 751 STA LASTIN
FD07: 85 2F 751 STA LASTIN
FD09: C0 80 752 CPY #$80 ;SET CARRY ON Y
FD0B: 60 753 RTS
FD0B: 60 753 RTS
FD0C: A4 24 754 RDKEY LDY CH
FD0E: B1 28 755 LDA (BASL),Y ;SET SCREEN TO FLASH
FD0E: B1 28 755 LDA (BASL),Y ;SET SCREEN TO FLASH
FD10: 48 756 PHA
FD11: 29 3F 757 AND #$3F
FD11: 29 3F 757 AND #$3F
FD13: 09 40 758 ORA #$40
FD15: 91 28 759 STA (BASL),Y
FD15: 91 28 759 STA (BASL),Y
FD17: 68 760 PLA
FD18: 6C 38 00 761 JMP (KSWL) ;GO TO USER KEY-IN
FD18: 6C 38 00 761 JMP (KSWL) ;GO TO USER KEY-IN
FD1B: E6 4E 762 KEYIN INC RNDL
FD1D: D0 02 763 BNE KEYIN2 ;INCR RND NUMBER
FD1D: D0 02 763 BNE KEYIN2 ;INCR RND NUMBER
FD1F: E6 4F 764 INC RNDH
FD21: 2C 00 C0 765 KEYIN2 BIT KBD ;KEY DOWN?
FD21: 2C 00 C0 765 KEYIN2 BIT KBD ;KEY DOWN?
FD24: 10 F5 766 BPL KEYIN ; LOOP