Chapter 2: Analyzer Description ABL77 Service Manual
Module Descriptions, Continued
CPU board
The CPU board (REF: 902-679) consists of a 486 SX microcomputer with at least
8 MB memory, VGA, serial and parallel ports, and floppy disk control (see
Figure 2-27). The interface board connects the microcomputer to its battery support
and speaker as well as interfacing with the printer and the COM 1 port. Valves,
motors, and sensor states are controlled by commands sent via the serial
connection to the custom analog board.
Figure 2-27
Touch screen
controller
The touch screen controller (REF: 365-437) processes all signals from the touch
screen and sends these signals to the CPU (see Figure 2-28).
Figure 2-28
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2-38 Rev. F
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