microBTX (also called uBTX) is a computer
motherboard form factor. A microBTX is and can support up to four expansion slots.
See also
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Comparison of computer form factors
In computing, the motherboard form factor is the specification of a motherboard – the dimensions, power supply type, location of mounting holes, number of ports on the back panel, etc. Specifically, in the IBM PC compatible industry, standard ...
References
Motherboard form factors
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