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