2101

8E87

20

A9

8D

DUMPT

JSR

START

;INIT VIA & CKSUM, SA TO BUFAD & START

2102

8E8A A9 07

 

 

LDA

#7

;CODE FOR TAPE OUT

2103

8E8C 8D 02 A4

 

STA

TAPOUT

;BIT 3 USED FOR HI/LO

2104

8E8F A2 01

 

 

LDX

#1

;KIM DELAY CONSTANT (OUTER)

2105

8E91

A4

FD

 

 

LDY

MODE

;128 KIM, 0 HS

2106

8E93

10

03

 

 

BPL

DUMPT1

;KIM - DO 128 SYNS

2107

8E95

AE 30 A6

 

LDX TAPDEL

;HS INITIAL DELAY (OUTER)

2108

8E98

8A

 

 

DUMPT1 TXA

 

 

2109

8E99

48

 

 

 

PHA

 

 

2110

8E9A A9 16

 

DMPT1A LDA

#SYN

 

2111

8E9C 20 0A 8F

 

JSR

OUTCTX

 

2112

8E9F 88

 

 

 

DEY

 

 

2113

8EA0 D0 F8

 

 

BNE DMPT1A

;INNER LOOP (HS OR KIM)

2114

8EA2 68

 

 

 

PLA

 

 

2115

8EA3 AA

 

 

 

TAX

 

 

2116

8EA4 CA

 

 

 

DEX

 

 

2117

8EA5 D0 F1

 

 

BNE

DUMPT1

 

2118

8EA7 A9 2A

 

 

LDA

#'*'

;WRITE START

2119

8EA9 20 0A 8F

 

JSR

OUTCTX

 

2120

8EAC

 

 

 

 

 

 

 

2121

8EAC AD 4E A6

 

LDA

ID

;WRITE ID

2122

8EAF 20 3F 8F

 

JSR

OUTBTX

 

2123

8EB2

 

 

 

 

 

 

 

2124

8EB2 AD 4C A6

 

LDA SAL

;WRITE SA

2125

8EB5 20 3C 8F

 

JSR

OUTBCX

 

2126

8EB8 AD 4D A6

 

LDA

SAH

 

2127

8EBB 20 3C 8F

 

JSR

OUTBCX

 

2128

8EBE

 

 

 

 

 

 

 

2129

8EBE

 

 

 

;

 

 

 

2130

8EBE 24 FD

 

 

BIT MODE

;KIM OR HS

2131

8EC0 10 0C

 

 

BPL

DUMPT2

 

2132

8EC2

 

 

 

 

 

 

 

2133

8EC2 AD 4A A6

 

LDA EAL

;HS, WRITE EA

2134

8EC5 20 3C 8F

 

JSR

OUTBCX

 

2135

8EC8 AD 4B A6

 

LDA

EAH

 

2136

8ECB 20 3C 8F

 

JSR

OUTBCX

 

2137

8ECE

 

 

 

 

 

 

 

2138

8ECE A5 FE

 

DUMPT2 LDA BUFADL

;CHECK FOR LAST BYTE

2139

8ED0 CD 4A A6

 

CMP

EAL

 

2140

8ED3 D0 25

 

 

BNE

DUMPT4

 

2141

8ED5 A5 FF

 

 

LDA

BUFADH

 

2142

8ED7 CD 4B A6

 

CMP

EAH

 

2143

8EDA D0 1E

 

 

BNE

DUMPT4

 

2144

8EDC

 

 

 

 

 

 

 

2145

8EDC A9 2F

 

 

LDA #'/'

;LAST, WRITE "/"

2146

8EDE 20 0A 8F

 

JSR

OUTCTX

 

2147

8EE1 AD 36 A6

 

LDA

SCR6

;WRITE CHECK SUM

2148

8EE4 20 3F 8F

 

JSR

OUTBTX

 

2149

8EE7 AD 37 A6

 

LDA

SCR7

 

2150

8EEA 20 3F 8F

 

JSR

OUTBTX

 

2151

8EED

 

 

 

 

 

 

 

2152

8EED A9 04

 

 

LDA #EOT

;WRITE TWO EOT'S

2153

8EEF 20 3F 8F

 

JSR

OUTBTX

 

2154

8EF2 A9 04

 

 

LDA

#EOT

 

2155

8EF4 20 3F 8F

 

JSR

OUTBTX

 

2156

8EF7

 

 

 

 

 

 

 

2157

8EF7

 

 

 

DT3E

=*

 

;(SET "OK" MARK)

2158

8EF7 4C 41 8D

 

JMP

OKEXIT

 

2159

8EFA

 

 

 

 

 

 

 

2160

8EFA A0 00

 

DUMPT4 LDY

#0

;GET BYTE

2161

8EFC B1 FE

 

 

LDA

(BUFADL),Y

 

2162

8EFE 20 3C 8F

 

JSR

OUTBCX

;WRITE IT W/CHK SUM

 

 

 

 

 

 

 

 

 

Page 136
Image 136
Apple II manual Dumpt, DUMPT1 TXA, DMPT1A LDA, DUMPT4 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.