| Folders |
| {parent folder} | AEWIN | Aquarius Systems (See ASI) |
| _Unknown manufacturer | AGAMA | ARBOR |
| _Unknown model | AIC | Arima Computer (see Rioworks) |
| 2THEMAX | AIR | ARISTO |
| AAEON | AIS | Ascent Technology (See ASL) |
| ABILITY | ALBATRON | ASI |
| ABIT | ALD | Asian Digital Corporation (See ADC) |
| ACE project (See A-win) | All Industrial Systems Inc. (See AIS) | ASK |
| ACER | ALLROUND | ASKA |
| ACER - MICROSTAR OEM | ALTIMA | ASL |
| ACHITEC | ALTON | ASOURCE |
| ACHME | AMAQUEST | ASROCK |
| ACMA | AMAX | AST |
| ACORP | AmazePC | ASUS MOTHERBOARDS |
| ACQUTEK | AMERICAN DIGICOM | ASUS NOTEBOOKS |
| ACROSSER | American Megatrends (See AMI) | ASZ (See ASL) |
| ACUSHARP | American Predator (See APC) | ATILA |
| ADC | AMI | ATIMA |
| ADCOM | AmJet (See J-Mark) | A-TREND |
| ADI | AMP | ATRIC |
| ADLINK | AMPTRON | ATTRO |
| Advanced Industrial Computer (See AIC) | Anson (See Amaquest) | AVT |
| Advanced Integration Research (See AIR) | Ansoon (See Amaquest) | A-WIN |
| Advanced Micro Products (See AMP) | ANTEC | AXIOM |
| ADVANTECH | AOMEGA | AXLE |
| ADVENT PC | AOPEN | AXPER |
| AETON | APC | AZZA |