PC-9801FA-02 (NEC)

SCSI I / F in the PC-9801FA / FS / FX, MATE-A SCSI dedicated slot
SCSI connector is Amphenol half 50 pin.
When connecting an HDD for NEC check of ROM, the first vendor name
If the three letters do not begin with NEC (NEC, NECTSU, NECTOR, etc.),
Beeps continuously and does not start the body by entering an infinite loop.
There are 2 8 dip switches and 2 3 jumper switches on the board.

· 8 stations dip switch SW1: SCSI ID number of the board, interrupt level,
　DMA channel setting
1-2-3: Set board SCSI ID number
　ON-ON-ON ID 7 (Factory setting)
4-5-6: Setting interrupt level
　OFF-OFF-OFF ■ INT 0
　ON-OFF-OFF INT 1
　OFF-ON-OFF INT 2
　ON-ON-OFF INT 3 (default setting)
　OFF-OFF-ON INT 5
　ON-OFF-ON INT 6
7-8: DMA channel setting
　OFF-OFF DMA # 0 (factory setting)
　ON-OFF ■ Setting prohibited
　OFF-ON DMA # 2
　ON-ON DMA # 3

・ 8 stations dip switch SW2: ROM memory address, body model, Power on
　ROM accessibility setting at the time of
1-2-3-4-5-6-7: Setting ROM memory address + main unit model
(1) mate-A not equipped with PC-9801FA / FS / FX and high res board
　OFF-ON-ON-OFF-ON-ON-ON ■ Memory address \ DC 000 h ~ \ DDFFF h
(2) mate-A equipped with high res board
　OFF-ON-ON-OFF-ON-OFF-ON Memory Address:
　　　　　　　　　　　　　 Normal mode \ DC 000 h ~ \ DDFFF h
　　　　　　　　　　　　　 In high resolution mode \ EC 000 h ~ \ EDF FF h
　※ \ means 0h or Fh.
8: Setting of ROM accessibility at Pow on
　ON ■ ROM accessible (factory setting)
　OFF ■ ROM can not be accessed

・ Three jumper switches SW3 and SW4: I / O port address setting
Below, short pin at SW3 ■ Short pin at SW4 ■ I / O port address
Order of:
　01-02 ■ 01 02 ■ CC0h, CC2h, CC4h (factory setting)
　02-03 ■ 01 02 ■ CD0h, CD2h, CD4h
　01-02 ■ 02 03 ■ CE0h, CE2h, CE4h
　02-03 ■ 02 03 ■ CF 0 h, CF 2 h, CF 4 h