0923

86A3

20

FA 86

SP2C

JSR

DIFFZ

 

0924

86A6

B0

03

 

 

BCS

SP2D

 

0925

86A8

4C

C4

81

SPEXIT JMP

RESALL

 

0926

86AB 20 4D 83

SP2D

JSR

CRLF

 

0927

86AE CD 58 A6

 

CMP

MAXRC

 

0928

86B1

90

05

 

 

BCC

SP2E

 

0929

86B3

AD 58 A6

 

LDA

MAXRC

 

0930

86B6

B0

02

 

 

BCS

SP2F

 

0931

86B8

69

01

 

SP2E

ADC

#1

 

0932

86BA 8D 3D A6

SP2F

STA

RC

 

0933

86BD A9 3B

 

 

LDA

#$3B

;SEMI COLON

0934

86BF 20 47 8A

 

JSR

OUTCHR

 

0935

86C2

AD 3D A6

 

LDA

RC

 

0936

86C5

20

F4

86

 

JSR

SVBYTE

 

0937

86C8

A5

FF

 

 

LDA

$FF

 

0938

86CA 20 F4 86

 

JSR

SVBYTE

 

0939

86CD A5 FE

 

 

LDA

$FE

 

0940

86CF 20 F4 86

 

JSR

SVBYTE

 

0941

86D2

A0

00

 

MORED2 LDY

#$00

 

0942

86D4

B1

FE

 

 

LDA

($FE),Y

 

0943

86D6

20

F4

86

 

JSR

SVBYTE

 

0944

86D9

20

86

83

 

JSR

INSTAT

;STOP IF KEY DEPRESSED

0945

86DC B0 CA

 

 

BCS

SPEXIT

 

0946

86DE 20 B2 82

 

JSR

INCCMP

 

0947

86E1

70

C5

 

 

BVS

SPEXIT

 

0948

86E3

CE 3D A6

 

DEC

RC

 

0949

86E6

D0

EA

 

 

BNE

MORED2

 

0950

86E8

AE 37 A6

 

LDX

SCR7

 

0951

86EB AD 36 A6

 

LDA

SCR6

 

0952

86EE 20 F4 82

 

JSR

OUTXAH

 

0953

86F1

18

 

 

 

CLC

 

 

0954

86F2

90

AF

 

 

BCC

SP2C

 

0955

86F4

20

DD 82

SVBYTE JSR

CHKSAD

 

0956

86F7

4C

FA 82

 

JMP

OUTBYT

 

0957

86FA 20 2E 83

DIFFZ

JSR

ZERCK

 

0958

86FD AD 4A A6

DIFFL

LDA

P3L

 

0959

8700

38

 

 

 

SEC

 

 

0960

8701

E5

FE

 

 

SBC

$FE

 

0961

8703

48

 

 

 

PHA

 

 

0962

8704

AD 4B A6

 

LDA

P3H

 

0963

8707

E5

FF

 

 

SBC

$FF

 

0964

8709

F0

04

 

 

BEQ

DIFF1

 

0965

870B

68

 

 

 

PLA

 

 

0966

870C

A9

FF

 

 

LDA

#$FF

 

0967

870E

60

 

 

 

RTS

 

 

0968

870F

68

 

 

DIFF1

PLA

 

 

0969

8710

60

 

 

 

RTS

 

 

0970

8711

4C

27

88

E2PARM JMP CALC3

;MAY BE CALC OR EXEC

0971

8714

 

 

 

B3PARM =*

 

 

0972

8714

 

 

 

;

 

 

 

0973

8714

 

 

 

; 3 PARAMETER COMMAND EXECUTE BLOCKS

0974

8714

 

 

 

;

 

 

 

0975

8714

C9

46

 

FILL3

CMP #'F'

;FILL MEM

0976

8716

D0

21

 

 

BNE

BLK3

 

0977

8718

20

9C

82

 

JSR

P2SCR

 

0978

871B

A9

00

 

 

LDA

#0

 

0979

871D

8D

52

A6

 

STA

ERCNT

;ZERO ERROR COUNT

0980

8720

AD 4E A6

 

LDA

P1L

 

0981

8723

A0

00

 

F1

LDY

#0

 

0982

8725

91

FE

 

 

STA

($FE),Y

 

0983

8727

D1

FE

 

 

CMP

($FE),Y

;VERIFY

0984

8729

F0

03

 

 

BEQ

F3

 

 

 

 

 

 

 

 

 

 

Page 117
Image 117
Apple II manual MORED2 LDY

II specifications

The Apple II, launched in April 1977, was one of the first highly successful mass-produced microcomputer products. It marked a significant leap in personal computing, setting standards for future developments in the industry. Created by Steve Wozniak and Steve Jobs, the Apple II differentiated itself with its user-friendly design, appealing aesthetics, and robust capabilities.

One of the standout features of the Apple II was its open architecture, which allowed users to expand and enhance the computer's functionality. This design enabled hundreds of third-party hardware and software developers to contribute to its ecosystem, resulting in an array of peripherals, including printers, modems, and storage devices. The Apple II utilized a MOS Technology 6502 microprocessor running at a clock speed of 1 MHz. Initially equipped with 4 KB of RAM, the machine could be expanded to 48 KB, accommodating more complex applications and programs.

The Apple II was also notable for its colorful graphics. It was one of the first computers to support color display, offering a 6-color palette with a resolution of 280x192 pixels in 16 colors when using its Color Graphics Card. This feature significantly enhanced the visual appeal of games and educational software developed for the platform, making computing more accessible and entertaining for various audiences.

Apple's commitment to user experience was evident in the design of the machine. It featured an integrated keyboard and a plastic case, which was both durable and visually appealing. The self-contained design included drive bays for floppy disk drives, allowing for quicker data access than traditional tape drives. It also supported audio output, enabling sound effects and music, a novelty at the time.

The introduction of the Apple DOS operating system further underscored the machine's capabilities. DOS streamlined file management and made it easier for users to navigate and manage their data. The combination of hardware and software positioned the Apple II as an educational tool and a gaming platform, fostering a vibrant software ecosystem.

The Apple II family continued to evolve, with variations like the Apple II+, IIe, and IIgs being introduced over the years. These iterations brought enhancements in memory, processing power, and graphics capabilities. The legacy of the Apple II endures, not only as a foundational product in personal computing but also as a symbol of innovation that paved the way for future advancements in technology. Its impact is still felt today, as it inspired countless developers and shaped the trajectory of the computer industry.