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Small Form Factor Boards


An Industry Standard Module (ISM) is defined as a 90mm x 96mm form factor board outline without bus expansion. It specifies the board size, four fixed mounting holes, and flexible “expansion zones” for additional circuitry or I/O and/or bus connectors. ISM is an umbrella concept to provide coherence to the many different boards that are available in this 90mm x 96mm footprint.


ISM modules are small, easy-to-use, and scalable as they provide a powerful set of building blocks for a variety of different applications. Depending upon the interconnect technology, they can be stacked “piggyback”on top of each other to expand or customize a system solution. This reduces cost and bulk while increasing mounting and packag- ing options. The best known stackable ISM implementation is PC/104; however, recently SUMIT and other connector configurations have been defined and are being produced as well.


SUMIT + ISM = SUMIT-ISM Adding SUMIT expansion (see page 12) on the ISM


form factor creates SUMIT-ISM. It specifies where the SUMIT AB connectors are located on a 90mm x 96mm module.


It also supports a legacy option for PC/104 (Type 1) or PCI-104 (Type 2) modules by allowing the


continued use of their connectors in the existing locations plus re-using established physical dimensions and mounting


SUMIT-ISM card with legacy PC/104 connector


holes. Furthermore, SUMIT-ISM expansion can be supported on EPIC, EBX, and other standard and custom form factors.


SBCs using SUMIT-ISM modules allow a designer to build small, reliable, easy-to-use, cost-effective, and stackable systems since they provide a powerful building block for a variety of different applications.


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