Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 190)

Theory of Operation Model 9110EH Instruction Manual
of peripheral devices through the motherboard, the main printed circuit assembly on the
rear panel (Figure 3-2).
Figure 10-12: Model 9110EH Electronic Block Diagram
10.3.1. CPU
The CPU is a low power (5 VDC, 0.8A max), high performance, 386-based microcomputer
running a version of the DOS operating system. Its operation and assembly conform to the
PC-104 specification, version 2.3 for embedded PC and PC/AT applications. It has 2 MB of
DRAM memory on board and operates at 40 MHz clock rate over an internal, 32-bit data
and address bus. Chip to chip data handling is performed by two 4-channel, direct memory
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