| Computer form factors |
PCB Size (mm) |
| WTX | 356×425 |
| AT | 350×305 |
| Baby-AT | 330×216 |
| BTX | 325×266 |
| ATX | 305×244 |
| LPX | 330×229 |
| NLX | 254×228 |
| microATX | 244×244 |
| DTX | 244×203 |
| FlexATX | 229×191 |
| Mini-DTX | 203×170 |
| EBX | 203×146 |
| microATX (Min. This article compares the IBM compatible Personal computer Motherboard form factors – that is the different sizes and specific or de-facto standards of major system In the area of IBM compatible Personal computers the AT form factor referred to the dimensions and layout ( form factor) of the Motherboard for Enhancements Low-profile - With the push for ever-smaller systems a redesigned backplane that shaves inches off height requirements is a benefit to The ATX (for Advanced Technology Extended) form factor was created by Intel in 1995. LPX (Low Profile eXtension originally developed by Western Digital was a loosely defined Motherboard format ( Form factor) widely used in the 1990s NLX (New Low Profile Extended was a form factor proposed by Intel and developed jointly with IBM, DEC, and other vendors for low profile low cost mass-marketed microATX, also known as µATX (sometimes Transliterated as mATX or uATX on Online forums is a Small form factor standard The DTX Form factor was announced to be in development by AMD on January 10, 2007. FlexATX is a PC motherboard Form factor derived from ATX. The specification was released in 1999 by Intel as an addendum to the MicroATX The DTX Form factor was announced to be in development by AMD on January 10, 2007. Embedded Board eXpandable (EBX is a standardized computer form factor microATX, also known as µATX (sometimes Transliterated as mATX or uATX on Online forums is a Small form factor standard ) | 171×171 |
| Mini-ITX | 170×170 |
| EPIC (Express) | 165×115 |
| Nano-ITX | 120×120 |
| COM Express | 125×95 |
| ETX / XTX | 114×95 |
| Pico-ITX | 100×72 |
| PC/104(-Plus) | 96×90 |
| microETXexpress | |
| nanoETXexpress | |
| mobile-ITX | 75×45 |
In the area of IBM compatible personal computers, the AT form factor referred to the dimensions and layout (form factor) of the motherboard for the IBM AT. Mini-ITX is a 17 x 17 cm (or 693 x 693 Inches) low-power Motherboard Form factor developed by VIA Technologies. Embedded Platform for Industrial Computing (EPIC is a computer Form factor standard put forth by a combined effort from WinSystems VersaLogic Octagon Systems Micro/sys Nano-ITX is a computer Motherboard form factor first proposed by VIA Technologies at CeBIT in March 2003, and implemented in late 2005 COM Express, a Computer-on-module (COM form factor is a highly integrated and compact PC that can be used in a design application much like an integrated circuit ETX, standing for Embedded Technology eXtended, is a highly integrated and compact (3 ETX, standing for Embedded Technology eXtended, is a highly integrated and compact (3 Pico-ITX is a PC Motherboard form factor announced by VIA Technologies in January 2007 and demonstrated later the same year at CeBIT. PC/104 (or PC104) is an Embedded computer standard controlled by the PC/104 Consortium which defines both a Form factor Mobile-ITX is the smallest x86 compliant Motherboard Form factor. IBM PC compatible computers are those generally similar to the original IBM PC, XT, and AT. A personal computer ( PC) is any Computer whose original sales price size and capabilities make it useful for individuals and which is intended to be operated This article compares the IBM compatible Personal computer Motherboard form factors – that is the different sizes and specific or de-facto standards of major system A motherboard is the central or primary Printed circuit board (PCB making up a complex electronic system such as a modern Computer or Laptop The IBM Personal Computer/AT, more commonly known as the IBM AT and also sometimes called the PC AT or PC/AT, was IBM 's second-generation Like the IBM PC and IBM XT models before it, many third-party manufcturers produced motherboards compatible with the IBM AT form factor, allowing end users to upgrade their computers for faster processors. The IBM Personal Computer XT, often shortened to the IBM XT or simply XT, was IBM's successor to the original IBM PC. The IBM AT became a widely copied design during the booming home computer market in the 1980s. IBM clones made at the time began using AT compatible designs, contributing to its popularity. IBM PC compatible computers are those generally similar to the original IBM PC, XT, and AT. In the 1990s many computers still used AT and its variants. Since 1997, the AT form factor has been largely supplanted by ATX. The ATX (for Advanced Technology Extended) form factor was created by Intel in 1995.
Contents |
Design
The original AT motherboard, later known as "Full AT", is 12 inches (305 mm) wide and 13. Industry Standard Architecture (in practice almost always shortened to ISA) was a Computer bus standard for IBM compatible computers A motherboard is the central or primary Printed circuit board (PCB making up a complex electronic system such as a modern Computer or Laptop 8 inches (350 mm) deep, which means it will not fit in "mini desktop" or "minitower cases". The board's size also means that it takes up space behind the drive bays, making installation of new drives more difficult. A drive bay is a standard-sized area for adding hardware to a computer The power connectors for AT motherboards are two nearly identical 6-pin cables. Unfortunately, the two power connectors it requires are not easily distinguishable, leading many people to damage their boards when they were improperly connected. When plugged in, the two black wires on each connector must be adjacent to each other, creating a row of 4 black wires (out of the total 12) and a correct connection. Technicians developed mnemonic devices to help assure proper installation, including "black wires together in the middle" and "red and red and you are dead. A mnemonic device (nəˈmɒnɪk is a Memory aid Commonly met mnemonics are often verbal something such as a very short poem or a special word used to help a person remember "
Variants
In 1985 IBM introduced Baby AT. Year 1985 ( MCMLXXXV) was a Common year starting on Tuesday (link displays 1985 Gregorian calendar) International Business Machines Corporation abbreviated IBM and nicknamed "Big Blue", is a multinational Computer Technology Soon after all computer makers abandoned AT for the cheaper and smaller Baby AT, using it for computers from the 286 processors to the first Pentiums. The Pentium brand refers to Intel 's single-core x86 Microprocessor based on the P5 fifth-generation Microarchitecture. These motherboards have similar mounting hole positions and the same eight card slot locations as those with the AT form factor, but are 2" (51 mm) narrower and marginally shorter. The size (220x330 mm) and flexibility of this kind of motherboard were the key to success of this format. While now obsolete, a few computers are still using it, and modern PC cases are generally backwards compatible to fit Baby AT.
In 1995, Intel introduced ATX, a form factor which gradually replaced older Baby AT motherboards. Year 1995 ( MCMXCV) was a Common year starting on Sunday. Events of 1995 The ATX (for Advanced Technology Extended) form factor was created by Intel in 1995. During the late 1990s, a great majority of boards were either Baby AT or ATX. Many motherboard manufacturers continued making Baby AT over ATX since many computer cases and power supplies in the industry were still compatible with AT boards and not ATX boards. Also, the lack of an eighth slot on ATX motherboards kept it from being used in some servers. After the industry adapted to ATX specifications, it became common to design cases and power supplies to support both Baby AT and ATX motherboards.
Power connector
| Color | Pin | Signal |
|---|---|---|
| P8. 1 | Power Good | |
| P8. 2 | +5 V | |
| P8. 3 | +12 V | |
| P8. 4 | −12 V | |
| P8. 5 | Ground | |
| P8. 6 | Ground | |
| P9. 1 | Ground | |
| P9. 2 | Ground | |
| P9. 3 | −5 V | |
| P9. 4 | +5 V | |
| P9. 5 | +5 V | |
| P9. 6 | +5 V | |
External links
- Motherboards of AT and Baby AT
- Baby AT Power Supply
- Baby AT Case
- Full AT Case
- Full AT Power Supply
- ATX Power Supply Links
- AT power supply connectors with pinouts
- PC Magazine
- How to destroy your computer by miswiring the AT power supply connectors.
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