Curtis AR-B1682 operation manual System Clock Select and CPU Setting, DOC Memory, DOC 2000 SEG SW1

2-4. SYSTEM CLOCK SELECT AND CPU SETTING

System clock and CPU frequency ratio are automatically detected by BIOS. Please keep sw2 , sw3-1 , sw3-2 ,and sw3-3 off.

2-5. RS232/485 SELECTION

The jumper settings are as follows: (1)COM 1 & COM2 (RS232)

J1	J2 1	2	3
1
2
3
Terminator	7	8	9

(2)COM 2(RS485)

J1	J2	1	2	3
1	485+
2	485-
3
Terminator		7	8	9

J3

1 3 5

2 4 6

J3

1 3 5

2 4 6

2-6. DOC MEMORY

(1)DOC Memory Mapping Selection (JP6, JP7)

A 32-pin DOC socket supports a DOC (Disk-on-Chip) up to 72Mb. This PnP Flash ROM DOC can be installed as one of the user’s hard disk drive. And if set as Drive C, it can be used to boot up the computer with MS-DOS installed. It offers much faster access than a floppy or hard disk and greatly increases reliability under harsh environment.

The DOC Memory Mapping is as follows:

DOC Memory Map

JUMPER SETTING

(pin closed)

JP6 JP7

JUMPER

ILLUSTRATION

Manufactory default --- CC000h-CDFFFh

(2) DOC 2000 SEG (SW1)

	2	4	6	8
						On
	1	3	5	7
SEG	3-4				5-6		7-8
CC00H	ON					ON	OFF
D000H	ON					OFF	ON
D400H	ON					OFF	OFF
D800H	OFF					ON	ON

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