| While the PC and PC/AT architectures have become extremely popular in both general purpose (desktop) and dedicated (non-desktop) applications, its use in embedded microcomputer applications has been limited due to the large size of standard PC and PC/AT motherboards and expansion cards.This document supplies the mechanical and electrical specifications for a compact version of the ISA (PC and PC/AT) bus, optimized for the unique requirements of embedded systems applications. The specification is herein referred to as "PC/104", based on the 104 signal contacts on the two bus connectors (64 pins on P1, plus 40 pins on P2).Briefly, the needs of embedded applications have been satisfied by PC/104, through the following key differences from standard ISA bus: Reducing the form-factor, to 3.550 by 3.775 inches (90 by 96 mm). Eliminating the need for backplanes or card cages, through its self-stacking bus. Minimizing component count and power consumption (to typically 1-2 Watts per module), by reducing required bus drive on most signals to 4 mA. PC/104 specifies two module versions — 8-bit and 16-bit — which correspond to the PC and PC/AT bus implementations, respectively. |
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