Apple II manual SBC PCL Form ADDR-PC-2

Models: II

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Page 62
Image 62

F50D: 8A

57

 

TXA

 

 

F50E: 18

58

 

CLC

 

 

F50F: E5 3A

59

 

SBC

PCL

;FORM ADDR-PC-2

F511: 85 3E

60

 

STA

A2L

 

F513: 10 01

61

 

BPL

REL3

 

F515: C8

62

 

INY

 

 

F516: 98

63

REL3

TYA

 

 

F517: E5 3B

64

 

SBC

PCH

 

F519: D0 6B

65

ERR3

BNE

ERR

;ERROR IF >1-BYTE BRANCH

F51B: A4 2F

66

FINDOP

LDY

LENGTH

 

F51D: B9 3D 00

67

FNDOP2

LDA

A1H,Y

;MOVE INST TO (PC)

F520: 91 3A

68

 

STA

(PCL),Y

 

F522: 88

69

 

DEY

 

 

F523: 10 F8

70

 

BPL

FNDOP2

 

F525: 20 1A FC

71

 

JSR

CURSUP

 

F528: 20 1A FC

72

 

JSR

CURSUP

;RESTORE CURSOR

F52B: 20 D0 F8

73

 

JSR

INSTDSP

;TYPE FORMATTED LINE

F52E: 20 53 F9

74

 

JSR

PCADJ

;UPDATE PC

F531: 84 3B

75

 

STY

PCH

 

F533: 85 3A

76

 

STA

PCL

 

F535: 4C 95 F5

77

 

JMP

NXTLINE

;GET NEXT LINE

F538: 20 BE FF

78

FAKEMON3 JSR

TOSUB

;GO TO DELIM HANDLER

F53B: A4 34

79

 

LDY

YSAV

;RESTORE Y-INDEX

F53D: 20 A7 FF

80

FAKEMON

JSR

GETNUM

;READ PARAM

F540: 84 34

81

 

STY

YSAV

;SAVE Y-INDEX

F542: A0 17

82

 

LDY

#$17

;INIT DELIMITER INDEX

F544: 88

83

FAKEMON2 DEY

 

;CHECK NEXT DELIM

F545: 30 4B

84

 

BMI

RESETZ

;ERR IF UNRECOGNIZED DELIM

F547: D9 CC FF

85

 

CMP

CHRTBL,Y

;COMPARE WITH DELIM TABLE

F54A: D0 F8

86

 

BNE

FAKEMON2

;NO MATCH

F54C: C0 15

87

 

CPY

#$15

;MATCH, IS IT CR?

F54E: D0 E8

88

 

BNE

FAKEMON3

;NO, HANDLE IT IN MONITOR

F550: A5 31

89

 

LDA

MODE

 

F552: A0 00

90

 

LDY

#$0

 

F554: C6 34

91

 

DEC

YSAV

 

F556: 20 00 FE

92

 

JSR

BL1

;HANDLE CR OUTSIDE MONITOR

F559: 4C 95 F5

93

 

JMP

NXTLINE

 

F55C: A5 3D

94

TRYNEXT

LDA

A1H

;GET TRIAL OPCODE

F55E: 20 8E F8

95

 

JSR

INSDS2

;GET FMT+LENGTH FOR OPCODE

F561: AA

96

 

TAX

 

 

F562: BD 00 FA

97

 

LDA

MNEMR,X

;GET LOWER MNEMONIC BYTE

F565: C5 42

98

 

CMP

A4L

;MATCH?

F567: D0 13

99

 

BNE

NEXTOP

;NO, TRY NEXT OPCODE.

F569: BD C0 F9

100

 

LDA

MNEML,X

;GET UPPER MNEMONIC BYTE

F56C: C5 43

101

 

CMP

A4H

;MATCH?

F56E: D0 0C

102

 

BNE

NEXTOP

;NO, TRY NEXT OPCODE

F570: A5 44

103

 

LDA

FMT

 

F572: A4 2E

104

 

LDY

FORMAT

;GET TRIAL FORMAT

F574: C0 9D

105

 

CPY

#$9D

;TRIAL FORMAT RELATIVE?

F576: F0 88

106

 

BEQ

REL

;YES.

F578: C5 2E

107

NREL

CMP

FORMAT

;SAME FORMAT?

F57A: F0 9F

108

 

BEQ

FINDOP

;YES.

F57C: C6 3D

109

NEXTOP

DEC

A1H

;NO, TRY NEXT OPCODE

F57E: D0 DC

110

 

BNE

TRYNEXT

 

F580: E6 44

111

 

INC

FMT

;NO MORE, TRY WITH LEN=2

F582: C6 35

112

 

DEC

L

;WAS L=2 ALREADY?

F584: F0 D6

113

 

BEQ

TRYNEXT

;NO.

F586: A4 34

114

ERR

LDY

YSAV

;YES, UNRECOGNIZED INST.

F588: 98

115

ERR2

TYA

 

 

F589: AA

116

 

TAX

 

 

F58A: 20 4A F9

117

 

JSR

PRBL2

;PRINT ^ UNDER LAST READ

F58D: A9 DE

118

 

LDA

#$DE

;CHAR TO INDICATE ERROR

 

 

 

 

 

 

Page 62
Image 62
Apple II manual SBC PCL Form ADDR-PC-2