Editing Apple I

{{Infobox computer
| name         = Apple I
| image        = [[File:CopsonApple1 2k cropped.jpg|300px]]
| caption      = Original Apple I "NTI" motherboard (1976)
| developer    = Apple Computer Company (Steve Wozniak)
| manufacturer = Apple Computer Company
| type         = Single‑board personal computer
| release_date = April 11, 1976
| discontinued = September 30, 1977
| price        = US$666.66 (board only)
| units_sold   = ~200
| cpu          = MOS 6502 @ 1 MHz
| memory       = 4 KB RAM (standard)<br />Expandable to 48 KB
| storage      = 1200‑baud cassette interface (optional)
| display      = Composite video – 40 × 24 uppercase text
| sound        = —
| dimensions   = 15 in × 9 in bare PCB
| weight       = ≈ 1.6 lb (board)
| os           = 256‑byte WOZ Monitor ROM • Integer BASIC on cassette
| successor    = [[Apple II]]
| model        = "Byte Shop" & "NTI" revisions
}}

The '''Apple I''' (also styled '''Apple‑1''') was Apple Computer Company's first commercial product and the machine that launched the personal computer revolution.<ref>{{cite web |url=https://www.computerhistory.org/collections/catalog/X210.83A |title=Apple-1 Computer |publisher=Computer History Museum |access-date=2025-01-25}}</ref><ref>{{cite web |url=https://americanhistory.si.edu/collections/object/nmah_1692121 |title=Apple I Microcomputer |publisher=National Museum of American History |access-date=2025-01-25}}</ref> Hand‑built by Steve Wozniak and marketed by Steve Jobs from a Los Altos garage, it proved there was demand for pre‑assembled microcomputers and financed development of the groundbreaking Apple II.<ref>{{cite web |url=https://guides.loc.gov/this-month-in-business-history/april/apple-computer-founded |title=The Founding of Apple Computer, Inc. |publisher=Library of Congress |access-date=2025-01-25}}</ref>

== Historical Context ==

By March 1, 1976, Wozniak completed the basic design of his computer after being inspired by demonstrations at the Homebrew Computer Club and his desire to make affordable computing accessible to hobbyists.<ref>{{cite web |url=https://www.historyofinformation.com/detail.php?id=3019 |title=Steve Wozniak & Steve Jobs Release the Apple I |publisher=History of Information |access-date=2025-01-25}}</ref> The development was directly enabled by the revolutionary '''MOS 6502 processor''', which debuted in 1975 at just $25—compared to $175 for competing Intel 8080 and Motorola 6800 processors.<ref>{{cite web |url=https://spectrum.ieee.org/chip-hall-of-fame-mos-technology-6502-microprocessor |title=Chip Hall of Fame: MOS Technology 6502 Microprocessor |publisher=IEEE Spectrum |date=2023-12-04 |access-date=2025-01-25}}</ref>

=== Key Historical Milestones ===
* '''Homebrew origins:''' Designed for the Homebrew Computer Club; early prototypes were wire‑wrapped before the green fiberglass production board
* '''Byte Shop breakthrough:''' Paul Terrell ordered 50 fully assembled boards at US$500 each, forcing Apple to move from kits to finished hardware<ref>{{cite web |url=https://engineering.berkeley.edu/steve-wozniak-inventor-and-apple-co-founder/ |title=Steve Wozniak: Inventor and Apple co-founder |publisher=UC Berkeley Engineering |date=2023-07-27 |access-date=2025-01-25}}</ref>
* '''Seed capital:''' Wozniak sold his HP‑65 calculator for $500 and Jobs sold his VW Microbus for $1,500 to fund the first batch of parts, raising $1,300 total<ref>{{cite web |url=https://www.cultofmac.com/apple-history/apple-computer-founded |title=Apple is founded by Steve Jobs, Woz and Ron Wayne |publisher=Cult of Mac |date=2025-04-01 |access-date=2025-01-25}}</ref>
* '''Pricing quirk:''' The retail price of '''US$666.66''' reflected Wozniak's fondness for repeating digits and delivered a one‑third markup on the $500 wholesale cost<ref>{{cite web |url=https://lemelson.mit.edu/resources/steve-jobs-and-steve-wozniak |title=Steve Jobs and Steve Wozniak |publisher=Lemelson-MIT Program |access-date=2025-01-25}}</ref>

== Technical Architecture ==
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{| class="wikitable styled-table" style="width:70%; text-align:center;"
|+'''Apple I System Specifications'''
! Component !! Specification !! Details
|-
| '''CPU''' || MOS 6502 @ 1.023 MHz || 2/7 × NTSC color subcarrier (14.31818 MHz ÷ 14)
|-
| '''Memory Architecture''' || 4 KB standard, 48 KB maximum || 8 KB, 12 KB, 16 KB, 20 KB, 24 KB, 32 KB, 48 KB configurations
|-
| '''ROM''' || 256 bytes || WOZ Monitor at $FF00–$FFFF
|-
| '''Video System''' || 40 × 24 character display || 7-bit ASCII, uppercase only, 60 Hz refresh
|-
| '''I/O Interfaces''' || Composite video, ASCII keyboard || TTL-compatible, positive video logic
|-
| '''Expansion''' || Edge connectors || 44-pin bus, cassette interface optional
|-
| '''Power Requirements''' || +5V @ 3A, +12V @ 0.5A, -5V @ 0.2A || Unregulated supply, on-board regulation
|}

=== Processor Details ===
The Apple I was among the first computers to use the revolutionary '''MOS Technology 6502''' processor.<ref>{{cite web |url=https://www.c64-wiki.com/wiki/MOS_Technology_6502 |title=MOS Technology 6502 |publisher=C64-Wiki |access-date=2025-01-25}}</ref> Key specifications:

* '''8-bit microprocessor''' with 16-bit address bus (64 KB address space)
* '''56 instructions''' (early Apple I units had 55 instructions, missing ROR)
* '''$25 retail price''' in 1975 (equivalent to ~$140 in 2025)
* '''1 MHz maximum speed''' (Apple I ran at 1.023 MHz for NTSC video timing)
* '''Registers:''' 8-bit Accumulator, X/Y Index registers, Stack Pointer, Program Counter, Status register

=== Memory Configuration ===
{| class="wikitable styled-table" style="width:90%; text-align:left;"
|+'''Apple I Memory Map'''
! Address Range !! Size !! Function
|-
| $0000–$0FFF || 4 KB || RAM (standard configuration)
|-
| $1000–$BFFF || 44 KB || Additional RAM (optional expansion)
|-
| $C000–$CFFF || 4 KB || Peripheral interface area
|-
| $D000–$DFFF || 4 KB || ROM expansion area (unused)
|-
| $E000–$EFFF || 4 KB || Integer BASIC ROM area (when loaded)
|-
| $F000–$FEFF || 3.75 KB || Monitor ROM area (unused)
|-
| $FF00–$FFFF || 256 bytes || '''WOZ Monitor ROM'''
|}

=== Video Display System ===
The Apple I's video system was revolutionary for its time, providing a complete TV-compatible display:<ref>{{cite web |url=https://www.apple1registry.com/en/theapple1.html |title=The Apple-1 |publisher=Apple-1 Registry |access-date=2025-01-25}}</ref>

* '''Character matrix:''' 40 columns × 24 rows (960 characters total)
* '''Character set:''' 7-bit ASCII, uppercase letters and symbols only
* '''Display timing:''' 60 Hz vertical, 15.75 kHz horizontal (NTSC compatible)
* '''Video output:''' 1V p-p composite video, positive sync
* '''Character generator:''' 5×7 dot matrix in 7×8 character cell
* '''Memory usage:''' 960 bytes for screen buffer ($D000–$D3BF)

== Production Variants ==
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The Apple I was manufactured in two distinct production runs with notable differences:<ref>{{cite web |url=https://www.apple1registry.com/ |title=Apple-1 Registry |access-date=2025-01-25}}</ref><ref>{{cite web |url=https://www.willegal.net/appleii/apple1-originals.htm |title=Apple 1 Registry |author=WillEgal |access-date=2025-01-25}}</ref>

{| class="wikitable styled-table" style="width:95%; text-align:left;"
|+'''Apple I Production Variants'''
! Variant !! Production Period !! Quantity !! Distinguishing Features
|-
| '''Byte Shop Boards''' || April 1976 || ~50-75 units || • Hand-soldered components<br/>• No silkscreen legend<br/>• Round ceramic decoupling capacitors<br/>• Hand-written serial numbers (01-00##)<br/>• Some ceramic CPU/PIA chips
|-
| '''NTI Boards''' || Late 1976 || ~125-150 units || • PCB manufactured by North Star Technical (NTI)<br/>• White silkscreen legend with "NTI" marking<br/>• Square multilayer capacitors (usually green)<br/>• Improved component layout<br/>• Quality control stickers/stamps
|}

=== Component Analysis ===
Early Apple I boards show fascinating variations reflecting the transition from hobbyist to commercial production:

* '''Capacitors:''' Byte Shop boards used brown/blue disc ceramics; NTI boards featured green multilayer types
* '''Trimmer resistors:''' First batch used Spectrol potentiometers; second batch used Bourns metal film trimmers  
* '''IC packages:''' Mix of ceramic (premium) and plastic (cost-reduced) packages
* '''Assembly quality:''' Hand-soldered first batch vs. wave-soldered production boards

== Software & Operation ==
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Upon power-up, the Apple I drops into the WOZ Monitor at the backslash prompt. The 256-byte monitor ROM provided essential system functions:<ref>{{cite web |url=https://archive.org/details/Apple1Manual1976 |title=Apple 1 Manual (1976) |publisher=Internet Archive |access-date=2025-01-25}}</ref>

{| class="wikitable styled-table" style="width:80%; text-align:left;"
|+'''WOZ Monitor Commands'''
! Command !! Function !! Example
|-
| '''R''' || Run program from address || '''E000R''' (start BASIC)
|-
| '''address:''' || Examine/modify memory || '''300: A9 00''' (store $A9 $00)
|-
| '''.''' || Print register contents || Shows A, X, Y, P, S registers  
|-
| '''G''' || Go (continue execution) || Resume after breakpoint
|-
| '''Ctrl+C''' || Return to monitor || Break out of running program
|}

=== Software Ecosystem ===
Apple provided several software offerings on cassette tape:

* '''Integer BASIC''' – 4K BASIC interpreter by Steve Wozniak
* '''Blackjack''' – Card game demonstration  
* '''Star Trek''' – Text-based space exploration game
* '''Micro-Chess''' – Chess program by Peter Jennings
* '''Mastermind''' – Code-breaking logic game

== Sales & Distribution ==
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{| class="wikitable styled-table" style="width:90%; text-align:center;"
|+'''Apple I Sales Packages'''
! Package !! Contents !! Price (1976) !! Target Market
|-
| '''Logic Board Only''' || Assembled PCB with ROMs installed || US$666.66 || Electronics hobbyists
|-
| '''Cassette Interface (ACI)''' || Plug-in card + documentation || US$75 || Data storage capability  
|-
| '''Complete System''' || Board + case + PSU + keyboard + ACI || ~US$900–1,200 || Turn-key operation
|}

=== Distribution Channels ===
Jobs successfully established Apple I sales through the first generation of computer retailers:<ref>{{cite web |url=https://www.computerhistory.org/brochures/a-c/ |title=Apple Computer, Inc. |publisher=Computer History Museum |access-date=2025-01-25}}</ref>

* '''Byte Shop''' (Palo Alto, CA) – Primary distributor, ordered first 50 units
* '''Itty Bitty Machine Company''' (Evanston, IL) – Early microcomputer retailer
* '''Data Domain''' (Bloomington, IN) – Regional computer store
* '''Computer Mart''' (New York City) – East Coast distribution

== Surviving Examples & Documentation ==
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Current research indicates approximately '''46-62 verified Apple I computers''' remain in existence, with documentation maintained by the Apple-1 Registry.<ref>{{cite web |url=https://www.apple1registry.com/en/list.html |title=Apple-1 Registry List |publisher=Apple-1 Registry |access-date=2025-01-25}}</ref> Notable auction results demonstrate their historical significance:

{| class="wikitable styled-table" style="width:85%; text-align:center;"
|+'''Notable Apple I Auction Records'''
! Year !! Auction House !! Sale Price !! Board Details
|-
| 2014 || Bonhams || US$905,000 || Working NTI board with documentation
|-
| 2020 || RR Auction || US$458,711 || Fully functional with original peripherals  
|-
| 2022 || RR Auction || US$677,196 || Production prototype (damaged condition)
|-
| 2025 || RR Auction || US$375,000 || "Bayville" Apple I (#91 in registry)
|}

=== Museum Collections ===
Several world-class institutions preserve Apple I computers for public education:<ref>{{cite web |url=https://www.apple1registry.com/en/museums.html |title=Apple-1 Museums |publisher=Apple-1 Registry |access-date=2025-01-25}}</ref>

* '''Computer History Museum''' (Mountain View, CA) – NTI board in Revolution exhibit
* '''National Museum of American History''' (Washington, DC) – Smithsonian collection
* '''Science Museum''' (London, UK) – European computing history display  
* '''Powerhouse Museum''' (Sydney, AU) – Level 3 iconic exhibition
* '''Deutsches Museum''' (Munich, Germany) – Technical history collection

== Legacy & Impact ==
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The Apple I's significance extends far beyond its ~200-unit production run. It established fundamental principles that defined the personal computer industry:<ref>{{cite web |url=https://www.computerhistory.org/revolution/personal-computers/17/300 |title=The Apple II |publisher=Computer History Museum |access-date=2025-01-25}}</ref>

=== Technical Innovations ===
* '''Pre-assembled boards''' eliminated kit-building complexity
* '''Integrated video output''' provided TV-compatible display without additional hardware
* '''Efficient design''' minimized chip count through clever engineering
* '''Expandable architecture''' supported memory growth from 4KB to 48KB

=== Business Model Innovation ===
* '''Complete system concept''' – moved beyond bare circuit boards to working computers
* '''Retail distribution''' – established computer specialty stores as sales channel
* '''Marketing focus''' – emphasized simplicity and user-friendliness over technical specifications
* '''Upgrade path''' – offered trade-in programs to migrate customers to Apple II

=== Industry Influence ===
The Apple I directly financed development of the Apple II, which became the foundation of Apple's success and sparked the personal computer revolution of the late 1970s. Its design philosophy of elegant simplicity, powerful yet accessible technology, and focus on the user experience became hallmarks of Apple's approach that continue today.

== Replicas & Emulation ==
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Modern enthusiasts have created several reproduction projects:

{| class="wikitable styled-table" style="width:90%; text-align:left;"
|+'''Apple I Reproduction Projects'''
! Project !! Type !! Features
|-
| '''Mimeo 1''' || Exact reproduction || Period-correct components, original PCB layout
|-
| '''Obtronix Apple I''' || Modern replica || Socketed ICs, modern power supply
|-
| '''Briel Replica-1''' || Enhanced replica || PS/2 keyboard support, additional features
|-
| '''Apple 1emu''' || Software emulation || Runs Apple I software on modern PCs
|-
| '''MESS/MAME''' || Multi-system emulator || Accurate Apple I hardware simulation
|}

== Technical Documentation ==
Original Apple documentation included:<ref>{{cite web |url=https://www.apple1registry.com/en/soft.html |title=Software and Documents at the Apple-1 Registry |publisher=Apple-1 Registry |access-date=2025-01-25}}</ref>

* '''Apple-1 Operation Manual''' – Complete system documentation with schematics
* '''BASIC Manual''' – Programming guide for Integer BASIC
* '''Assembly Instructions''' – For customers building complete systems
* '''Cassette Interface Documentation''' – ACI card installation and operation

== References ==
<references/>

[[Category:Apple Vintage Computers]]
{{Navbox-AppleVintage|state=collapsed}}