Citizen GSX-190 Service Manual Page 54

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PN 4237242C
2.4-2
INSTRUMENT DESCRIPTION
SYSTEM CONTROL
Figure 2.4-1 AT Motherboard
User Resource Adapter (URA) Card
The URA card is located in the upper chassis (Figure 2.2-1) and its main responsibility is to
interface the system software with user resources, specifically the keypad and the display. In
addition to various support circuits, the URA card also has non-volatile CMOS RAM, a Data
Acquisition circuit and a Utility Timer circuit.
Switch and jumper settings are summarized on Table 2.4-2, Figure 2.4-2 shows the location
of the connectors, switches and jumper in addition to the jumper setting. Table 2.4-2 and
Figure 2.4-2 are at the end of the description of the URA card.
W3
(1-2, 3-4)
J15 SER1
J14 SER2
J17 FLOPPY
J18 PARALLEL
P8
P9
SW1
J19
EXT BATT
BATTERY
J20 IDE
BANK 0 BANK 1 BANK 2 BANK 3
W3
NYLON
MOUNTING
POST(8)
CC MD V1.0
GROUND
SCREW
J21
(Reset)
J22
(Speaker)
J23
(Keylock)
J24
(IDE
activity)
J25
(Turbo
LED)
J26
(Turbo
SW)
7242009A
J17
(Floppy disk
drive)
J18
(Parallel printer
port)
SW1
GROUND
SCREW
J15
(Serial 1 port)
J14
(Serial 2 port)
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