PC-9801-83, PC-9801-84 (NEC)

C bus B4680 interface board EC with 10BASE-2 / 5 connector
(= NIC / LAN board).Signal transmission method is baseband transmission method.
Two 8-deep dip switches and one 3-deep dip switch on the board,
There is one dip-shaped changeover switch.

・ 8 stations dip switch SW1: System I / O address and main unit model
　settings of
1-2: System I / O address setting 
　ON-ON 0888h, 0889h, 088Bh, 088Ch, 088Dh (factory setting)
　ON-OFF 1888h, 1889h, 188Bh, 188Ch, 188Dh
　OFF-ON 2888h, 2889h, 288Bh, 288Ch, 288Dh
　OFF-OFF 3888h, 3889h, 388Bh, 388Ch, 388Dh
3-4: Not used (Factory setting: ON-OFF)
5-6: Setting of machine model
　ON-ON 286/386/486 machines (default setting) 
　ON-OFF ■ 8086 / V30 loading machine
　OFF-ON PC-98 XA 
　OFF-OFF ■ Setting prohibited
　Some notebooks / laptops need an I / O expansion unit
7-8: Not used (always ON-ON)

・ 8 stations dip switch SW2: Switch fixed (always ON-ON-ON-OFF-ON-OFF-OFF-ON-ON)

· Triple dip switch SW3: 10BASE-2 / 5 switching 
　ON (C side) 10BASE-2 (default setting) 
　OFF (E side) 10BASE-5
　※ This is described in the description of the user's manual.
　　The figure of the state of ON-ON-ON is published as setting.

・ Dip-shaped changeover switch SW4: 10BASE-2 / 5 whichever interface
　Set whether to supply +12 V power
　C side 10BASE-2 (default setting)
　E side ■ 10BASE-5

An empty PLCC socket on the board will be used for future functional expansion.
socket".In addition, when future functions are expanded as reserved areas,
D0000h to DFFFh in normal mode, E6000h to EFFFFh in high resolution mode
8KB or 16KB is used in the memory address area of.

Card edge connector side when mounting on PC-9801U2 / UV2 / UV21
Turn the SW lever upward.

With PC-9801 / E / F1 / F2 / F3 / M2 / M3 / U2 / VF2 / VM0 / VM2 / VM4 / UV2
Need to supply +12 V by dedicated power supply PC-9801-77-01U in 10BASE-2 configuration
Yes.In PC-98 other than this, multiple mounting of this board using 10BASE-2
And dedicated boards are needed if other boards are using +12 V
It becomes.The PC-H98 and SV-H98 do not require a dedicated power supply in the 10BASE-2 configuration.Also
When using 10BASE-5, dedicated power is supplied to any of the PC-98, PC-H98 and SV-H98.
necessary.
Dedicated power supply pin assignment
     8 7 6
    5 4 3
      twenty one
1: GND
2: + 5V
3: GND
4: PCON
5: + 5V
6: GND
7: + 12V
8: + 5V

LED function beside 10BASE-5 connector
　Seeing from the back side, when +12 V is supplied to the LED ■ 10BASE-5 on the right side
　　　　　　　　　　　　 Lights up, dedicated power supply not connected, fuses off when blown
　When the LED on the left side 10BASE-2 seen from the back side is supplied with +12 V
　　　　　　　　　　　　 On, off when fuse is disconnected