Last revision of this page: February 2, 2025

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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• AMI: American Megatrends Inc.
• AST: Albert Safi Thomas (AST Research, Inc)
• AT: Advanced Technology (IBM AT)

• BASF: Badische Anilin und Soda Fabrik
• BASIC: Beginners' All-purpose Symbolic Instruction Code
• BIOS: Basic Input/Output System
• BOM: Bill Of Materials

• CF: CompactFlash
• CGA: Color Graphics Adapter (IBM)
• CMOS: Complementary Metal–Oxide–Semiconductor
• COM: COMmunication port
• CLI: Command Line Interface
• CP/M: Control Program/Monitor (originally)
• CP/M: Control Program for Microcomputers (later)
• CTC: Counter/Timer Circuit

• DD: Double Density
• DEC: Digital Equipment Corporation
• DIL: Dual In-Line Package
• DIP: Dual In-Line Package
• DMA: Direct Memory Access
• DOS: Disk Operating System
• DOS: Disk Operating System (IBM PC DOS)
• DOS: Disk Operating System (MS-DOS)
• DRAM: Dynamic Random-Access Memory
• DS: Double Sided Disk

• ED: Extra-High Density
• EGA: Enhanced Graphics Adapter (IBM)
• EMS: Expanded Memory Specification
• EPROM: Erasable Programmable Read Only Memory
• EEPROM: Electrically Erasable Programmable Read Only Memory
• E²PROM: Electrically Erasable Programmable Read Only Memory
• ESR: Equivalent Series Resistance

• FDC: Floppy Disk Controller
• FDD: Originally, the term actually means "Flexible Disk Drive". Later, however, it became „Floppy Disk Drive“
• FM: Frequency Modulation

• GUI: Graphical User interface

• HD: High Density
• HDC: Hard Disk Controller
• HDD: Hard Disk Drive
• HEX: Hexadecimal
• HGC: Hercules Graphics Card
• HMA: High Memory Area
• HP: Hewlett-Packard Company

• IBM: International Business Machines Corporation
• IDE: Integrated Drive Electronics
• IMA, IMG: a Floppy Image File Format
• IMSAI: Information Management Sciences Associates, Inc
• LMR: Longitudinal Magnetic Recording
• IRQ: Interrupt ReQuest
• ISA: Industry Standard Architecture

• LUN: Logical Unit Number (SCSI)

• MDA: Monochrome Display Adapter (IBM)
• MFM: Modified Frequency Modulation
• MS-DOS: Microsoft Disk Operating System

• NOS: New Old Stock

• OS: Operating System

• PC: Personal Computer (IBM PC)
• PC: Personal Computer
• PCB: Printed Circuit Board
• PC-DOS: Personal Computer Disk Operating System (IBM PC DOS)
• PIO: Parallel Input/Output
• PMR: Perpendicular Magnetic Recording
• PROM: Programmable Read Only Memory
• PSU: Power Supply Unit

• QD: Quad Density

• RAM: Random Access Memory
• ROM: Read Only Memory
• RLL: Run-Length Limited

• SASI: Shugart Associates System Interface
• SCSI: Small Computer System Interface
• SD: Single Density
• SIO: Serial Input/Output
• SOG: Semi-Official Get-together (Micro Cornucopia)
• SS: Single Sided Disk

• TEAC: Tokyo Electro-Acoustic Company
• TTL: Transistor–Transistor Logic

• UMA: Upper Memory Area
• UMB: Upper Memory Block

• VDI: Virtual Disk Image (Oracle Corporation)
• VFD: Virtual Floppy Disk (Connectix/Microsoft)
• VHD: Virtual Hard Disk (Connectix/Microsoft)
• VGA: Video Graphics Array (IBM)

• WD: Western Digital
• WDC: Western Digital Corporation
• WOPR: War Operation Plan Response ¯\_(ツ)_/¯

• XMS: Extended Memory Specification
• XT: eXtended Technology (IBM XT)
• XUB: XTIDE Universal BIOS

• 1D: Single Density
• 1.2MB, 1.2M: Floppy disk or drive, high density, 5.25"
• 1.44MB, 1.44M: Floppy disk or drive, high density, 3.5"

• 2D: Double Density
• 2.8MB, 2.8M: Floppy disk or drive, extra high density, 3.5"

• 360KB, 360K: Floppy disk or drive, double density, 5.25"

• 4D: Quad Density

• 720KB, 720K: Floppy disk or drive, double density, 3.5"