Acrosser AR-B1320 - Manual (Page 24)

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3.2 CPU BASE CLOCK SELECT (JP1)
This board provides two types of CPU input clocks; they are 60MHz and 80MHz. The CPU input
clock is twice the operating clock.
CPU Input Clock CPU Operating Clock JP1 Setting
80MHz 40MHz Short 1-2
66MHz 33MHz Short 2-3
Table 3-2 CPU Clock Settings
Factory Preset
Figure 3-2 JP1: CPU Clock Select
3.3 SWITCH SETTINGS (SW1)
SW1 is a 6-SPST DIP switch. It provides multi-purpose selection in one switch. The following
table gives the details:
SW1 Function When “OFF” When “ON” Factory Preset
Switch 1 Selects the base I/O address of SSD 210H-211H 290H-291H Off
Switch 2 Selects the memory segment of SSD C800H(8KB) D800H(8KB) Off
Switch 2 Selects the memory segment of DiskOnChip
(If Switch 3 is set as “ON”)
CA00H(8KB) DA00H(8KB) Off
Switch 3 DiskOnChip select Disabled Enabled Off
Switch 4 Reserved --- --- Off
Switch 5 COM-A port mode select RS-232C RS-485 Off
Switch 6 COM-B port mode select RS-232C RS-485 Off
Table 3-3 SW1 Settings
3.4 EXTERNAL LED HEADER (J1)
The J1 is a 4-pin right angle header. It allows you to connect an external power LED and an
external hard disk LED.
2
1 3
4
J1
Front View
1: Power LED+
3: Power LED-
2: Hard Disk LED+
4: Hard Disk LED-
Figure 3-3 J1: External LED Header
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