1162

E732

65

EA

 

 

ADC

LENGTH

 

1163

E734

8D

25

A4

 

STA

SAVPC

 

1164

E737

90

03

 

 

BCC

JD3

 

1165

E739

EE 26 A4

 

INC

SAVPC+1

 

1166

E73C 20 24 EA

JD3

JSR

CRCK

;<CR>

1167

E73F 4C 23 E7

 

JMP

JD1

 

1168

E742

60

 

 

JD4

RTS

 

 

1169

E743

 

 

 

 

 

 

 

1170

E743

 

 

 

;INITIALIZATION TABLE FOR 6522

1171

E743

340037FF25FFINTAB1 .DB

$34,$00,$37,$FF,$25,$FF,$25,$FF

1171

E749

25FF

 

 

 

 

 

1172

E74B FF FF 00 00

 

.DB

$FF,$FF,$00,T1I+T2I

1173

E74F E1 FF 7F

 

.DB

MOFF+PRST+SP12,$FF,$7F

1174

E752

 

 

 

;INITIALIZATION TABLE FOR 6532

1175

E752

FF FF 00 00 INTAB2 .DB

$FF,$FF,$00,$00

1176

E756

 

 

 

;INITIALIZATION TABLE FOR MONITOR RAM

1177

E756

7BE054E105EFINTAB3 .DW

NMIV3,IRQV3,OUTDIS

1178

E75C C70802CA0380

 

.DB

$C7,$08,$02,$CA,$03,$80,$00,$00

1178

E762

0000

 

 

 

 

 

1179

E764

00800D0D0000

 

.DB

$00,$80,$0D,$0D,$00,$00,$00

1179

E76A

00

 

 

 

 

 

 

1180

E76B

 

 

 

;SEE IF WE

HIT A SOFT BREAKPOINT (PART OF NMV3)

1181

E76B A2 07

 

CKB

LDX

#7

;COMPARE BRKPT LIST TO TRAP ADDR

1182

E76D BD 00 01

CKB2

LDA BKS,X

;GET ADDRESS OF NEXT BREAKPOINT

1183

E770

CA

 

 

 

DEX

 

 

1184

E771

CD 26 A4

 

CMP

SAVPC+1

;COMPARE TO SAVED PROGRAM COUNTER

1185

E774

D0

0A

 

 

BNE

CKB1

 

1186

E776

BD 00 01

 

LDA

BKS,X

 

1187

E779

CD 25 A4

 

CMP

SAVPC

 

1188

E77C D0 02

 

 

BNE

CKB1

;NO MATCH SO TRY NEXT BREAKPOINT

1189

E77E 38

 

 

 

SEC

 

;MATCH-SET MATCH FLAG

1190

E77F 60

 

 

 

RTS

 

 

1191

E780

CA

 

 

CKB1

DEX

 

 

1192

E781

10

EA

 

 

BPL CKB2

;MORE TO GO

1193

E783

18

 

 

 

CLC

 

;NO MATCH -RESET MATCH FLAG

1194

E784

60

 

 

 

RTS

 

 

1195

E785

 

 

 

 

 

 

 

1196

E785

 

 

 

;GET # OF LINES COUNT FOR GO-COMMAND,LIST-COMM

1197

E785

20

5D

EA

GCNT

JSR

RD2

 

1198

E788

90

02

 

 

BCC

GCN1

 

1199

E78A 49 0C

 

 

EOR

#$0C

;<SPACE>---> $2C ,<CR>---> $01

1200

E78C 8D 19 A4

GCN1

STA

COUNT

 

1201

E78F 60

 

 

 

RTS

 

 

1202

E790

 

 

 

 

 

 

 

1203

E790

 

 

 

;CHECK IF COUNT HAS REACHED ZERO

1204

E790

 

 

 

;COUNT=$2C

MEANS FOREVER

1205

E790

AD 19 A4

DONE

LDA

COUNT

;IF COUNT=0 WE ARE DONE

1206

E793

C9

2C

 

 

CMP

#$2C

;THIS MEANS FOR EVER

1207

E795

F0

09

 

 

BEQ

DON1

;SET ACC DIFF FROM ZERO

1208

E797

F8

 

 

 

SED

 

;DECREMENT COUNT IN DECIMAL

1209

E798

38

 

 

 

SEC

 

 

1210

E799

E9

01

 

 

SBC

#1

 

1211

E79B D8

 

 

 

CLD

 

 

1212

E79C 8D 19 A4

 

STA

COUNT

 

1213

E79F 60

 

 

 

RTS

 

 

1214

E7A0 A9 2C

 

DON1

LDA

#$2C

 

1215

E7A2 60

 

 

 

RTS

 

 

1216

E7A3

 

 

 

 

 

 

 

1217

E7A3 A0 00

 

FROM

LDY

#0

;PRINT "FR="

1218

E7A5 F0 02

 

 

BEQ

TO1

 

1219

E7A7

 

 

 

 

 

 

 

1220

E7A7 A0 05

 

TO

LDY #M3-M1

;PRINT "TO="

 

 

 

 

 

 

 

 

 

Page 158 Page 160
Page 159
Image 159
Apple II manual BCC JD3
Page 158 Page 160

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.
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