0790

E46A EE

10

A4

 

INC BKFLG

;SET FLG

0791

E46D

 

 

 

;CHCK OUTPUT DEV

 

0792

E46D AD

13

A4

DU1A

LDA

OUTFLG

 

0793

E470

C9

4B

 

 

CMP

#'K'

;TAPE FOR KIM?

0794

E472

D0

04

 

 

BNE

*+6

 

0795

E474

68

 

 

 

PLA

 

;PULL FLG

0796

E475

4C

87

E5

 

JMP

DUMPKI

;YES, GO OUTPUT WHOLE FILE

0797

E478

A0

01

 

 

LDY

#1

;OUTPUT ONE MORE BYTE

0798

E47A 20

CD E2

 

JSR

NXTADD

 

0799

E47D 20

F0

E9

DU2

JSR

CRLF

 

0800

E480

20

07

E9

 

JSR

RCHEK

;SEE IF HE WANTS TO INTERRUPT

0801

E483

 

 

 

;CALCULATE

# OF BYTES YET TO BE DUMPED

0802

E483

20

4D

EB

 

JSR

CLRCK

;CLEAR CKSUM

0803

E486

AD

1C

A4

 

LDA ADDR

;END ADDRESS-CURRENT ADDRESS

0804

E489

38

 

 

 

SEC

 

 

0805

E48A ED

1A

A4

 

SBC

S1

 

0806

E48D 48

 

 

 

PHA

 

;# OF BYTES LOW

0807

E48E AD

1D

A4

 

LDA

ADDR+1

 

0808

E491

ED

1B

A4

 

SBC

S1+1

 

0809

E494

D0

09

 

 

BNE

DU6

;# OF BYTES HIGH

0810

E496

 

 

 

;SEE IF 24

OR MORE BYTES TO GO

0811

E496

68

 

 

 

PLA

 

;# BYTES HIGH WAS ZERO

0812

E497

F0

42

 

 

BEQ

DU10

;ARE DONE

0813

E499

C9

18

 

 

CMP

#24

;# BYTES > 24 ?

0814

E49B 90

05

 

 

BCC

DU8

;NO ,ONLY OUTPUT REMAINING BYTES

0815

E49D B0

01

 

 

BCS DU7

;YES ,24 BYTES IN NEXT RECORD

0816

E49F 68

 

 

DU6

PLA

 

 

0817

E4A0 A9

18

 

DU7

LDA

#24

 

0818

E4A2

 

 

 

;OUTPUT ";" ,# OF BYTES AND SA

0819

E4A2 48

 

 

DU8

PHA

 

 

0820

E4A3 20

BA E9

 

JSR SEMI

;SEMICOLON

0821

E4A6 68

 

 

 

PLA

 

 

0822

E4A7 8D

19

A4

 

STA COUNT

;SAVE # OF BYTES

0823

E4AA 20

38

E5

 

JSR OUTCK

;OUTPUT # OF BYTES

0824

E4AD AD

1B

A4

 

LDA

S1+1

;OUTPUT ADDRESS

0825

E4B0 20

38

E5

 

JSR

OUTCK

 

0826

E4B3 AD

1A

A4

 

LDA

S1

 

0827

E4B6 20

38

E5

 

JSR

OUTCK

 

0828

E4B9

 

 

 

;OUTPUT DATA

 

0829

E4B9 20

31

E5

DU9

JSR OUTCKS

;GET CHAR SPEC BY S1 (NO PAG 0)

0830

E4BC A9

00

 

 

LDA

#0

;CLEAR DISP PTR

0831

E4BE 8D

15

A4

 

STA

CURPO2

 

0832

E4C1 20

5D

E5

 

JSR

ADDS1

;INCR S1+1,S1

0833

E4C4 CE

19

A4

 

DEC

COUNT

;DECREMENT BYTE COUNT

0834

E4C7 D0

F0

 

 

BNE DU9

;NOT DONE WITH THIS RECORD

0835

E4C9

 

 

 

;OUTPUT CKSUM

 

0836

E4C9 AD

1F

A4

 

LDA

CKSUM+1

 

0837

E4CC 20

3B

E5

 

JSR

OUTCK1

;WITHOUT CHEKA

0838

E4CF AD

1E

A4

 

LDA

CKSUM

 

0839

E4D2 20

3B

E5

 

JSR

OUTCK1

 

0840

E4D5 20

66

E5

 

JSR

INCS2

;INC VERTICAL COUNT

0841

E4D8 4C

7D

E4

 

JMP DU2

;NEXT RECORD

0842

E4DB

 

 

 

;ALL DONE

 

 

0843

E4DB A0

1C

 

DU10

LDY #M5-M1

;PRINT "MORE ?#

0844

E4DD 20

70

E9

 

JSR KEPR

;OUTPUT MSG AND GET AN ANSWER

0845

E4E0 C9

59

 

 

CMP

#'Y'

 

0846

E4E2 D0

03

 

 

BNE

*+5

 

0847

E4E4 4C

44

E4

 

JMP

DU1

;DUMP MORE DATA

0848

E4E7 68

 

 

 

PLA

 

;RESTORE FLG

0849

E4E8 8D

10

A4

 

STA

BKFLG

 

0850

E4EB

 

 

 

;OUTPUT LAST RECORD

 

0851

E4EB 20

66

E5

 

JSR

INCS2

 

 

 

 

 

 

 

 

 

 

Page 153
Image 153
Apple II manual E46A EE INC Bkflg SET FLG

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.