Computer History Museum
Institutional timeline and curated historical context across the personal-computer era.
Open CHM timeline →A living research record
The emulator code and historical text evolve as hardware behaviour is tested and better documentation is found. Corrections are preferable to preserving an attractive but inaccurate description. Image licensing is documented separately in IMAGE_CREDITS.txt.
Bitsavers
Large preservation archive of original manuals, technical references, service documentation, data books and software.
Open Bitsavers →Internet Archive manuals & software
Historical manuals, periodicals and software collections used for contemporary documentation and cross-checking.
Manual Library →Museum of HP Calculators
Specialist chronology and documentation for the long HP calculator lineage.
Open HP Museum →Research note
Research method
The museum separates three kinds of statement: technical specifications, historical chronology, and interpretation. Technical specifications are preferentially checked against original user, service, programming or technical-reference manuals. Chronology and market context are cross-checked with established institutional histories and contemporary documentation. Interpretive statements are presented as museum analysis rather than as numerical facts.
Sales totals, market-share figures, retail prices and “first” claims are treated cautiously: model definitions, regions, bundle configurations and reporting periods often differ between otherwise reputable sources.
Research note
Core archives and institutional references
The Computer History Museum timeline provides a useful independent chronology and broader industry context. Bitsavers preserves original technical manuals, service literature, data books and contemporary documentation. The Internet Archive preserves manuals, magazines and historical software collections.
These are starting points rather than a substitute for reading the model-specific manual when a precise hardware claim matters.
Research note
IBM PC / XT and compatible PCs
Primary reference path: IBM PC/XT technical-reference and DOS documentation preserved by Bitsavers, checked against broader Computer History Museum material on the IBM PC and the clone ecosystem.
This is the preferred basis for bus, BIOS, display and DOS-era architectural claims.
Research note
Apple II and Macintosh
Primary reference path: Apple technical/service material and Inside Macintosh documentation preserved by Bitsavers, supplemented by the Computer History Museum Apple timeline for chronology.
Technical behaviour is kept distinct from later retrospective marketing descriptions.
Research note
MOS, Commodore and Amiga
Primary reference path: MOS/Commodore component documentation, programmer references, drive documentation and service literature; wider chronology is checked against institutional and contemporary sources.
The museum treats custom silicon, software compatibility and vertical integration as separate claims rather than collapsing them into a single “better hardware” narrative.
Research note
Atari
Primary reference path: Atari hardware/operating-system technical reference notes and service literature, including original documentation for the 400/800 architecture.
The same discipline is applied across VCS, 8-bit computers, ST and Portfolio even though those systems represent very different engineering generations.
Research note
Acorn and BBC Micro
Primary reference path: original BBC Micro/Acorn user and technical documentation where available, with ARM history treated separately from the later success of ARM-derived handheld processors.
This avoids implying that the BBC Micro itself was an ARM computer while still showing the institutional and engineering lineage.
Research note
Sinclair
Primary reference path: original user/service documentation and contemporary UK computing sources for ZX81 and ZX Spectrum hardware, pricing and software context.
Regional market context is important because the machines’ historical significance was not uniform worldwide.
Research note
CP/M, MSX and cross-vendor standards
Primary reference path: original platform documentation and contemporary software manuals, supported by institutional histories of the early microcomputer market.
The important distinction is between software portability, electrical compatibility and later IBM-style hardware compatibility.
Research note
Calculators and pocket computers
Calculator research uses manufacturer manuals and service documentation, specialist calculator histories, and archived technical literature. The Museum of HP Calculators and HPCC are useful specialist references for HP model chronology and implementation details.
For calculators in particular, keyboard layout, persistent memory, programming model and display hardware are treated as platform features rather than cosmetic details.
Research note
Casio
The fx-8000G service manual identifies a NEC μPD1007G-005 CPU, μPD23C256 ROM, μPD4364 RAM, HD44352A01 and HD44353A01 LCD drivers and a μPD65005G-045-22 gate array. This corrects an earlier museum description that incorrectly associated the calculator CPU with the HD61710.
Casio graphing and pocket-computer claims are checked against model manuals/service documentation before secondary descriptions.
Research note
Hewlett-Packard
Primary reference path: original HP manuals and technical literature, the Museum of HP Calculators, and specialist HPCC material for later models such as the HP 50g.
The museum distinguishes the user-visible Saturn/RPL platform from later hardware that emulates the Saturn architecture on ARM.
Research note
Texas Instruments
Primary reference path: TI hardware manuals, service documentation and calculator guidebooks, with separate treatment of the TMS9900/TI-99 architecture, TMS70C46 TI-74/TI-95 handhelds, the Z80 graphing families and the later Motorola 68000 symbolic calculators.
Useful cross-checks include Texas Instruments’ discontinued-product guidebooks and graphing-calculator release chronology, plus model-specific hardware documentation. The “16-bit” TI-99/4A claim is therefore discussed in the context of its surrounding memory/I/O architecture rather than as a simple performance label.
Research note
Sharp
Primary reference path: original pocket-computer manuals and service information for CPU, LCD, memory and expansion details.
Pocket BASIC is treated as a genuine branch of personal computing, not merely as calculator history.
Research note
Epson
Primary reference path: HX-20 user/technical documentation and contemporary portable-computing literature.
Battery operation, built-in peripherals and physical integration are part of the historical interpretation.
Research note
Amstrad
Primary reference path: CPC manuals, firmware/programming documentation and contemporary UK market material.
Convenience of the integrated package is treated separately from CPU architecture.
Research note
Palm
Primary reference path: original Palm handbooks/developer documentation and contemporary PDA material.
Instant-on interaction, touch input and persistence are treated as architectural/user-interface constraints, not just product styling.
Research note
Nintendo, Sega and dedicated game hardware
Primary reference path: original hardware/software manuals where available, contemporary technical documentation and institutional histories of console generations.
Console business rules, cartridge ecosystems and battery constraints are considered alongside CPU/video/sound hardware.
Representative primary material
Technical references used for spot checks
These links illustrate the kind of original documentation preferred when a specific CPU, memory, I/O or display claim is being checked.
IBM PC/XT Technical Reference
Original IBM PC/XT technical-reference material preserved in the Bitsavers IBM PC archive.
IBM XT archive →Atari Technical Reference Notes
Original Atari 400/800 operating-system, source-listing and hardware reference material.
Atari technical reference →Apple technical archives
Apple II and Macintosh reference/service material, including Inside Macintosh, preserved by Bitsavers.
Apple archive →Casio fx-8000G service manual
Service and parts documentation identifying the calculator’s CPU, ROM, RAM, LCD drivers and gate array.
fx-8000G service manual →