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Definition: PC motherboards

Following is a list of motherboard types and form factors that have been used in PCs since the first IBM PC in 1981. The "TX" stands for "Technology Extended."

 Year            Width-Length
 Intr. Type      (Inches)

 BTX (Balanced TX)
 2004  BTX       12.8x10.5
 2004  microBTX  10.4x10.5
 2004  picoBTX      8x10.5

 ATX (Advanced TX)
 1999  FlexATX    9x7.5
 1997  microATX   9.6x9.6
 1996  Mini ATX  11.2x8.2
 1995  ATX        12x9.6
 1995  EATX       12x13

 ITX - (Information TX)
 2009  Mobile ITX  2.4x2.4
 2007  Pico ITX    3.9x2.8
 2005  Nano ITX    4.7x4.7
 2002  Mini ITX    6.7x6.7

 WTX (Workstation TX)
 1998  WTX       14x16.75

  (Cards plug into riser)
 2002  EmbATX   9.6x9.6
 1997  NLX        9x13.6
 1987  LPX        9x13
 1987  Mini LPX   9x11

 1987  Micro AT   8.5x8.5
 1987  Baby AT    8.5x13
 1984  AT          12x13
 1981  PC/XT      8.5x13