A
- AA – Anti Aliasing - Grafik
- AC97 – Audio Codec ´97 - Multimedia
- AF – Anisotrope Filterung - Grafik
- ACPI – Advanced Configuration and Power Interface - Windows
- ADC – Analog-Digital-Converter - Multimedia
- ADSL – Asymmetrical Digital Subscriber Line - Internet
- AES – Advanced Encryption Standard - Netzwerk
- AGP – Accelerated Graphics Port - Mainboard
- ALU – Arithmetic an Logic Unit - Prozessor
- AMD – Advanced Micro Devices
- ANSI – American National Standards Institute
- APIC – Advanced Programmable Interrupt Controller - Hardware
- APM – Advanced Power Management - Windows
- AROM – Alterable ROM; Associative ROM - Speicher
- ASCII – American Standard Code for Information Interchange
- ASPI – Advanced SCSI Programming Interface - Hardware
- ATA – Advanced Technology Attachment - Massenspeicher
- ATAPI – ATA Packet Interface - Massenspeicher
- ATM – Asynchronous Transfer Mode - Internet
- ATX – Advanced Technology Extended - Formfactor
- AV – Anti-Virus - Programm
- AXIOM – Advanced eXpress-I/O-Modul - Laptop