NIC Type	Ethernet
Transfer Rate	10Mbps
Data Bus	Multibus
Topology	Linear bus
Wiring Type	AUI transceiver via DB-15 on sub-connector
Boot ROM	Available (in firmware)

FACTORY CONFIGURED
Jumper	Setting
J2	Closed
J3	Open
J9	Open
J10	Closed
J12	Open
J61	Closed

ONBARD BUFFER RAM
Size	J4	J7
128KB	Open	Open
256KB	Open	Closed
512KB	Closed	Open

CARRIER SENSE CONFIGURATION
Setting		J5
»	Carrier sense enabled	Open
	Carrier sense disabled	Closed
Note:Carrier sense should be disabled when using a broad-band transceiver.

BOOT ROM
Setting	J6
Enabled	Closed
Disabled	Open

SIGNAL QUALITY CONFIGURATION
Setting		J11
»	Signal quality check enabled	Closed
	Signal quality check disabled	Open
Note:Signal quality checking should be disabled in any Ethernet version 1 installation.

MULTIBUS I/O (SLAVE) ACCESS CONFIGURATION

The EXOS 201 supports two simultaneous I/O ports, labeled port A and port B. In addition, the 201 supports either 8-bit or 16-bit memory addressing. When in 16-bit addressing mode, the port A address is selectable via jumper J52 & J53. Jumper J52A-G defines bits 1-7 of the memory address respectively, and J53A-H defines bits 8-15 respectively (when a jumper is closed, the bit that it corresponds to is set to 1; when open, the bit is set to 0.). For expample, if JP52A is closed, and JP52B-G & JP53A-H are open, the memory address selected is 0001h. When in 8-bit addressing mode, JP52A-G select bits 1-7 respectively, and JP53 is inactive. Regardless of the memory addressing mode, port B will always be located 1 byte above port A's address (e.g. Port A = 0001h, Port B = 0002h). Bit 0 is always set to 0 for port A, and 1 for port B. (Open=0, closed=1)

MULTIBUS MEMORY ADDRESSING METHOD
Memory Address	J50	J51
8-bit memory addressing	Open	Closed
16-bit memory addressing	Closed	Open

44-PIN ISBX CONNECTOR CONFIGURATION

The iSBX connector (IEEE P969 specification), is included for daughterboard options. There are two jumper-selectable interrupt lines (J13 and J14) which should be left open unless an optional daugherboard is installed. If a daughterboard is installed, one jumper or the other must be closed, but not both. JP13 closed selects IR0, JP14 selects IR1.

WATCHDOG TIMER CONFIGURATION
Setting	J15
Watchdog timer enabled	Open
Watchdog timer disabled	Closed

MULTIBUS INTERRUPT ACCESS
INT	J54A	J54B	J54C	J54D	J54E	J54F	J54G	J54H
0	Open	Open	Open	Open	Open	Open	Open	Closed
1	Open	Open	Open	Open	Open	Open	Closed	Open
2	Open	Open	Open	Open	Open	Closed	Open	Open
3	Open	Open	Open	Open	Closed	Open	Open	Open
4	Open	Open	Open	Closed	Open	Open	Open	Open
5	Open	Open	Closed	Open	Open	Open	Open	Open
6	Open	Closed	Open	Open	Open	Open	Open	Open
7	Closed	Open	Open	Open	Open	Open	Open	Open

USER PROGRAMMABLE EPROM TYPE
Type	J55	J56
27128	Closed	Open
27256	Open	Closed
None	Open	Open

MULTIBUS PRIORITY RESOLUTION METHOD
Resolution Scheme		J57
»	Enabled	Closed
	Disabled	Open

BUS ARBITRATION
Setting		J58	J59
»	Disabled	Open	Closed
	Enabled	Closed	Open

CLOCK CONFIGURATION
Setting	J60
/CCLK and /BCLK bus driven	Open
/CCLK and /BCLK card driven	Closed

DIAGNOSTIC LED(S)
LED	Status	Condition
1	On	Performing power on self tests
1	Flashing	Waiting for host or network initialization
1	Off	Card succesfully inserted into network
2	On	Data is being transmitted
2	Off	Data is not being transmitted
3	On	Attempted access to non-existant memory location on multibus
3	Pulsing	Multibus cycle in progress
3	Off	No multibus cycle in progress