TOP MICROSYSTEMS, INC. TOP/ARC-30 TWISTED PAIR NIC Type ARCnet Transfer Rate 2.5Mbps Data Bus 8-bit ISA Topology Star Linear bus Wiring Type Unshielded twisted pair Boot ROM Available [Image] NODE ADDRESS Node SW2/1 SW2/2 SW2/3 SW2/4 SW2/5 SW2/6 SW2/7 SW2/8 0 - - - - - - - - 1 Off On On On On On On On 2 On Off On On On On On On 3 Off Off On On On On On On 4 On On Off On On On On On 251 Off Off On Off Off Off Off Off 252 On On Off Off Off Off Off Off 253 Off On Off Off Off Off Off Off 254 On Off Off Off Off Off Off Off 255 Off Off Off Off Off Off Off Off Note:Node address 0 is used for messaging between nodes and must not be used. A total of 255 node address settings are available. The switches are a binary representation of the decimal node addresses. Switch 1 is the Least Significant Bit and switch 8 is the Most Significant Bit. The switches have the following decimal values: switch 1=1, 2=2, 3=4, 4=8, 5=16, 6=32, 7=64, 8=128. Turn off the switches and add the values of the off switches to obtain the correct node address. (On=0, Off=1) CABLE LENGTH AND RESPONSE/RECONFIGURATION TIMEOUTS Cable Length Response Reconfiguration JP1 JP2 Time Time » < 20,000 74.7µs 840ms Open Open feet > 20,000 283.4µs 1680ms Closed Open feet > 20,000 561.8µs 1680ms Open Closed feet > 20,000 1118.6µs 1680ms Closed Closed feet Note: All NICs on the network must have this option set the same. BOOT ROM Setting JP3 » Disabled Open Enabled Closed Note:A 2732 or 2764 boot ROM may be used in the boot ROM socket. If a 2732 is used, the chip must be INTERRUPT REQUEST IRQ JP4 JP5 JP6 JP7 JP8 » 2 Closed Open Open Open Open 3 Open Closed Open Open Open 4 Open Open Closed Open Open 5 Open Open Open Closed Open 7 Open Open Open Open Closed I/O BASE ADDRESS Address SW1/1 SW1/2 SW1/3 260-26Fh On On On 290-29Fh On On Off » 2E0-2EFh On Off On 2F0-2FFh On Off Off 300-30Fh Off On On 350-35Fh Off On Off 380-38Fh Off Off On 3E0-3EFh Off Off Off BASE MEMORY ADDRESS & BOOT ROM ADDRESS Base Address Boot ROM SW1/4 SW1/5 SW1/6 SW1/7 SW1/8 C0000h C2000h On On On On On C0800h C2000h On On On On Off C1000h C2000h On On On Off On C1800h C2000h On On On Off Off C4000h C6000h On On Off On On C4800h C6000h On On Off On Off C5000h C6000h On On Off Off On C5800h C6000h On On Off Off Off CC000h CE000h On Off On On On CC800h CE000h On Off On On Off CD000h CE000h On Off On Off On CD800h CE000h On Off On Off Off » D0000h D2000h On Off Off On On D0800h D2000h On Off Off On Off D1000h D2000h On Off Off Off On D1800h D2000h On Off Off Off Off D4000h D6000h Off On On On On D4800h D6000h Off On On On Off D5000h D6000h Off On On Off On D5800h D6000h Off On On Off Off D8000h DA000h Off On Off On On D8800h DA000h Off On Off On Off D9000h DA000h Off On Off Off On D9800h DA000h Off On Off Off Off DC000h DE000h Off Off On On On DC800h DE000h Off Off On On Off DD000h DE000h Off Off On Off On DD800h DE000h Off Off On Off Off E0000h E2000h Off Off Off On On E0800h E2000h Off Off Off On Off E1000h E2000h Off Off Off Off On E1800h E2000h Off Off Off Off Off MISCELLANEOUS NOTES This card may be used in a star topology by terminating one of the RJ-11 jacks.