Following is a list of motherboard types and form factors that have been used in PCs since the first IBM PC in 1981:
Maximum Size
Year Width-Length
Intr. Type In Inches
BTX (Balanced Technology Extended)
2004 BTX 12.8 - 10.5
2004 microBTX 10.4 - 10.5
2004 picoBTX 8 - 10.5
ATX (Advanced Technology Extended)
1999 FlexATX 9 - 7.5
1997 microATX 9.6 - 9.6
1996 Mini ATX 11.2 - 8.2
1995 ATX 12 - 9.6
1995 EATX 12 - 13 Extended ATX
LOW PROFILE (Expansion cards plug into riser)
2002 EmbATX 9.6 - 9.6 Embedded ATX
1997 NLX 9 - 13.6 NLX=New Low Profile
1987 LPX 9 - 13 Western Digital
1987 Mini LPX 9 - 11 Western Digital
MISCELLANEOUS
2002 Mini ITX 6.7 - 6.7 VIA Technologies
1998 WTX 14 - 16.75 Workstation TX
FIRST PCs
1987 Micro AT 8.5 - 8.5
1987 Baby AT 8.5 - 13
1984 AT 12 - 13
1981 PC/XT 8.5 - 13
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2009 The Computer Language Company Inc. All rights reserved. |
Additional Resources
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