What is PCI-104? 
The PCI-104 specification was introduced by the PC104 Embedded Consortium. PCI-104 is identical to the widely used PC104 plus combined ISA and PCI embedded standard except that the PC104 AT and XT connectors for the ISA bus are removed. Eliminating the large ISA bus connector gives an additional 10% of board area for either larger CPU chipsets, higher levels of integration, and/or I/O connectors. The PCI-104 specification still maintains the small 3.550 x 3.775-inch size, rugged design, and self-stacking architecture for embedded applications set by the PC104 Plus standards. It can also be offered in a fan less solution.
While the current PC104 and PC104 Plus standards will retain the ISA bus and support the large existing base of PC104 add-on modules, the PCI-104 specification defines a standard with PCI-compatible I/O features which allows video, audio, Ethernet, and contemporary communications to be handled on the single board computer. 
Another benefit of the new PCI-only format is its processor independence. ISA is primarily used as an x86 expansion bus in PC compatible systems, whereas, PCI can not only use the 386, 486, PIII, 586, AMD Geode, VIA C3, Eden, Celeron III, P4, Pentium M, and Celeron M, but it can also support other processor architectures as well.

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ACROSSER PC104 CPU Board: