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3.2.11 External Speaker Header (J3)
Besides the on board buzzer, you can use an external speaker by connecting J3 header directly.
3.2.12 Reset Header (J7)
J7 is used to connect to an external reset switch. Shorting these two pins will reset the system.
3.2.13 Battery Setting
(1) Battery Charger Select (JP4)
(2) External Battery Connector (J6)
J6 allows users to connect an external 4.5 to 6 VDC battery to the AR-B1474 if the on-board battery is empty.
Only the SRAM disk will sink the battery current. If no SRAM chip will be used, no battery is needed. The battery
charger on AR-B1474 does not source charge current to the external battery which connects on J6.
3.2.14 CRT Display Type Select (JP13)
J3
1 Speaker+
2 Speaker-
3 Speaker-
4 Speaker-
Figure 3-21 J3: External Speaker Header
1 2
Figure 3-22 J7: Reset Header
1 2 3
Rechargeable
Factory-Default Setting
Figure 3-23 JP4: Battery Charger Select
1 2
Figure 3-24 J6: External Battery Connector
JP13
1
2
3
Color Display
MONO/EGA/VGA Display
Factory-Default Setting
Figure 3-25 JP13: CRT Display Type Select
1 Reset+
2 Reset-
1 2 3
Non chargeable
1 Battery+
2 Battery-
1
2
3
AR-B1474 User¡ ¦ s Guide
3-11
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