Citizen GSX-190 Service Manual download pdf (Page 53)

PN 4237242C

2.4-1

INSTRUMENT DESCRIPTION

SYSTEM CONTROL

2.4 SYSTEM CONTROL

System control is the heart of the instrument. The components that form system control

translate executing programs (software) into mechanical actions. The cards responsible for

system control are the: AT motherboard, URA, DRAs and Motor/Solenoid Driver.

AT Motherboard

The motherboard is located in the upper chassis (Figure 2.2-1) and is the primary control in

the system. It is a standard AT motherboard, using an 80386, 20-MHz CPU. BIOS is AMIBIOS

with a custom default configuration for Coulter. This ensures that the BIOS configuration

defaults to the instrument configuration if battery backup power is lost.

The motherboard’s serial and Printer connectors and the floppy disk drive controller are used

for the instrument input/output.The four Coulter system cards (URA, DRA1, DRA2 and

SPAD) are plugged into the 16-bit motherboard slots.

The motherboard’s switches and jumpers are summarized in Table 2.4-1 and Figure 2.4-1

shows the locations of the switches, jumpers and connectors.

Switches and Jumpers

Table 2.4-1 AT Motherboard Switch and Jumper Settings

Switch or

Jumper Description MD II Setting

SW1-1 ON - Use on-board battery

OFF - Use off-board battery

SW1-2 ON - Enable battery

OFF - Disable battery

SW1-3 ON - Additional wait states for IDE interface

OFF - No additional wait states

OFF

SW1-4 ON - Color adapter

OFF - Monochrome adapter (does not matter when using EGA or VGA)

OFF

W3 (Jumper) 1 to 2, 3 to 4 - 256 K or 1 MB SIMMS

2 to 3 - 4 MB SIMMS

1 to 2, 3 to 4

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 271 272

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Citizen GSX-190 Service Manual Page 53