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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.
474 questions
For questions about the different versions and products of the Commodore 64
240 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.
211 questions
For questions related to the Commodore Amiga family of personal computers.
190 questions
For questions about the early IBM PC, clones and compatible systems.
MS-DOS, the Microsoft Disk Operating System, and its OEM-branded versions. Use [dos] instead for the x86 DOS family in general.
178 questions
For questions related to the use, restoration and imaging of floppy disks.
162 questions
For questions regarding graphical - as opposed to text - processing and display.
162 questions
Assembly languages in general, of any architecture. Use with the particular processor’s tag as appropriate.
158 questions
Processes and software for emulating retro hardware (e.g. MAME, QEMU). NOT EVERY EMULATION QUESTION IS ON-TOPIC; SEE TAG WIKI.
151 questions
Programming languages and constructs. Please check for language-specific tags first and use those instead, if applicable.
For questions regarding the Zilog Z80 microprocessor
146 questions
For questions about computer memory in a retrocomputing context
146 questions
For 6502 series of processors, including hardware and assembly language questions. Use with [hardware] for the hardware interface in particular.
127 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.
123 questions
For questions about the different versions and products of the Sinclair ZX Spectrum computer
120 questions
For questions regarding hardware and drivers used for video output.
116 questions
For questions about Apple's Macintosh line of computers.
105 questions
For questions about the applications and programs that can be run on retro devices (computers, etc.)
92 questions
For questions about the maintenance, usage, or history of retro keyboards.
91 questions
For questions regarding the products of IBM, International Business Machines.
90 questions
For quesitons regarding Commodore Business Machines itself or its products that do not have a more specific tag such as commodore-64 or amiga.
88 questions
Retro games, both hardware and software-based. NOT EVERY GAMING QUESTION IS ON-TOPIC. See tag wiki for guidance.
87 questions
For questions about the different versions and products of the NES (Nintendo Entertainment System)
79 questions
For general questions regarding operating systems on retrocomputers.
77 questions
76 questions
For use when seeking identification of a game played on a retrocomputer.
72 questions
For questions about the Unix operating system.
71 questions
For questions about the different versions and products released by Nintendo
71 questions
For questions regarding Cathode Ray Tube monitors
70 questions
For questions about Read Only Memory.
69 questions
for questions about retrocomputing mainframes or clusters
68 questions
General questions about computer chips and chipsets in retro hardware. Use a specific chip’s tag instead if available.
68 questions
Retrocomputing hardware and software created by Intel.
62 questions
Hard disk drives: hardware, connection, low-level format and drivers.
62 questions
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