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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

History of computers, digital electronics, hardware manufacturers, and software developers.
Retro hardware generally: boards, extension cards, power supplies, peripherals. Use more specific tags as appropriate; use [case] instead for enclosures.
569 questions
MS-DOS, the Microsoft Disk Operating System, its OEM-branded versions, and x86 DOS clones in general.
319 questions
For questions about the different versions and products of the Commodore 64
306 questions
The Apple II series of personal computers and related software and hardware. Use [apple-iigs] for the Apple IIgs in particular, or [apple] for Apple hardware in general.
273 questions
For questions about the early IBM PC, clones and compatible systems.
259 questions
Programming aspects of retro systems and historical programming languages. Please check for language-specific tags first and use those instead, if applicable.
255 questions
Assembly languages in general, of any architecture. Use with the particular processor’s tag as appropriate.
240 questions
For questions related to the Commodore Amiga family of personal computers.
227 questions
For questions regarding graphical - as opposed to text - processing and display.
212 questions
Use, restoration and imaging of floppy disks; low-level formats of floppy media. Consider [file-system] for high-level formatting.
211 questions
The Zilog Z80 microprocessor. Prefer [game-boy] instead for questions about the Game Boy CPU nicknamed the ‘GBZ80’.
202 questions
For questions about computer memory in a retrocomputing context
190 questions
For 6502 series of processors, including hardware and assembly language questions. Use with [hardware] for the hardware interface in particular.
185 questions
Processes and software for emulating retro hardware (e.g. MAME, QEMU). NOT EVERY EMULATION QUESTION IS ON-TOPIC; SEE TAG WIKI.
180 questions
BASIC: a high-level programming language favored in retro systems. For dialect-specific questions, use a tag such as [microsoft-basic], [applesoft-basic], etc.
176 questions
For questions regarding hardware and drivers used for video output.
166 questions
For questions about the different versions and products of the Sinclair ZX Spectrum computer
150 questions
Requests to identify a game played on a retro platform, based on appearance in media or a recollection. See tag wiki for guidance on identification questions.
142 questions
For questions about Apple's Macintosh line of computers.
137 questions
Retro games, both hardware and software-based. NOT EVERY GAMING QUESTION IS ON-TOPIC. See tag wiki for guidance.
136 questions
For questions regarding the products of IBM, International Business Machines.
131 questions
For questions relating to CPU - central processing unit
124 questions
For questions about the maintenance, usage, or history of retro keyboards.
123 questions
For questions about the applications and programs that can be run on retro devices (computers, etc.)
121 questions
Commodore Business Machines and their products. Use more specific tags like [commodore-64] or [amiga] instead if appropriate.
121 questions
For questions about the Unix operating system.
115 questions
Operating systems on retrocomputers generally.
109 questions
for questions about retrocomputing mainframes or clusters
99 questions
The C programming language: its historical aspects and use on/targetting retro platforms.
99 questions
Cathode Ray Tube monitors: principles of operation and use with computing devices. DO NOT REPAIR CRTs; SEE TAG WIKI FOR DETAILS.
96 questions
For questions about the different versions and products of the NES (Nintendo Entertainment System)
96 questions
General questions about computer chips and chipsets in retro hardware. Use a specific chip’s tag instead if available.
94 questions
Hard disk drives: hardware, connection, low-level format and drivers.
90 questions
Floppy drives and accessing floppy disks from historical computers, ranging from 8″ down to 3.25″ and other non-standard sizes.
89 questions
For questions about the different versions and products released by Nintendo
88 questions
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