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.
902 questions
Retro hardware generally: boards, extension cards, power supplies, peripherals. Use more specific tags as appropriate; use [case] instead for enclosures.
MS-DOS, the Microsoft Disk Operating System, its OEM-branded versions, and x86 DOS clones in general.
301 questions
For questions about the different versions and products of the Commodore 64
297 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.
264 questions
For questions about the early IBM PC, clones and compatible systems.
248 questions
Programming aspects of retro systems and historical programming languages. Please check for language-specific tags first and use those instead, if applicable.
246 questions
Assembly languages in general, of any architecture. Use with the particular processor’s tag as appropriate.
230 questions
For questions related to the Commodore Amiga family of personal computers.
220 questions
For questions regarding graphical - as opposed to text - processing and display.
205 questions
Use, restoration and imaging of floppy disks; low-level formats of floppy media. Consider [file-system] for high-level formatting.
201 questions
The Zilog Z80 microprocessor. Prefer [game-boy] instead for questions about the Game Boy CPU nicknamed the ‘GBZ80’.
190 questions
For questions about computer memory in a retrocomputing context
184 questions
Processes and software for emulating retro hardware (e.g. MAME, QEMU). NOT EVERY EMULATION QUESTION IS ON-TOPIC; SEE TAG WIKI.
177 questions
For 6502 series of processors, including hardware and assembly language questions. Use with [hardware] for the hardware interface in particular.
171 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.
170 questions
For questions regarding hardware and drivers used for video output.
151 questions
For questions about the different versions and products of the Sinclair ZX Spectrum computer
144 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.
132 questions
For questions about Apple's Macintosh line of computers.
128 questions
Retro games, both hardware and software-based. NOT EVERY GAMING QUESTION IS ON-TOPIC. See tag wiki for guidance.
126 questions
For questions regarding the products of IBM, International Business Machines.
125 questions
For questions about the maintenance, usage, or history of retro keyboards.
120 questions
For questions relating to CPU - central processing unit
116 questions
For questions about the applications and programs that can be run on retro devices (computers, etc.)
115 questions
Commodore Business Machines and their products. Use more specific tags like [commodore-64] or [amiga] instead if appropriate.
110 questions
For questions about the Unix operating system.
110 questions
Operating systems on retrocomputers generally.
100 questions
for questions about retrocomputing mainframes or clusters
99 questions
For questions about the different versions and products of the NES (Nintendo Entertainment System)
92 questions
The C programming language: its historical aspects and use on/targetting retro platforms.
92 questions
Cathode Ray Tube monitors: principles of operation and use with computing devices. DO NOT REPAIR CRTs; SEE TAG WIKI FOR DETAILS.
91 questions
Hard disk drives: hardware, connection, low-level format and drivers.
89 questions
For questions about the different versions and products released by Nintendo
83 questions
Floppy drives and accessing floppy disks from historical computers, ranging from 8″ down to 3.25″ and other non-standard sizes.
83 questions
For questions related to terminals such as WYSE, VT100 and Teletype.
81 questions
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