PC-9821N-U04, PC-9821N-U05 (NEC)

Docking station connected to 198 pin expansion bus of PC-9821 notebook
(PC-982N-U05 is a "docking station CD"). 8 stations dip
There are two switches and one quadruple dip switch.Expansion slot x1, built-in
Equipped with speaker x2, PC-9821N-U04 has file slot,
PC-9821N-U05 is also equipped with a CD-ROM drive (SCSI connection).Outside on the back
Display connector (D-sub 15-pin), SCSI connector (amphenol)
Half pitch 50-pin), additional 1MB_FDD connector available.

· 8 stations dip switch SW1: SCSI_ID, interrupt level, DMA channel
　settings of
1-2-3: SCSI_ID
　ON-ON-ON: ID = 7 (factory setting)
　　　　　　　　 Use with factory settings: PC-9821N-U05
　　　　　　　　 The CD-ROM drive has a fixed ID of 6
4-5-6: Interrupt level
  OFF-OFF-OFF: INT0 (IRQ3: factory setting)
  ON-OFF-OFF: INT1 (IRQ5)
  OFF-ON-OFF: INT2 (IRQ6)
  ON-ON-OFF: INT3 (IRQ9)
  ON-OFF-ON: INT5 (IRQ12)
  OFF-ON-ON: INT6 (IRQ13)
7-8: DMA channel setting
  OFF-OFF: DMA0
  ON-OFF: Setting prohibited
  OFF-ON: DMA2
  ON-ON: DMA3 (factory setting)

・ 8 stations dip switch SW2: Memory address, ROM access when Pow ON
　Access permission settings
1-2-3-4-5-6-7: Memory address
  OFF-ON-ON-OFF-ON-ON-ON: Memory address \ DC000- \ DCFFF (factory setting)
　　　　　　　　　　　　　Use as factory set
8: Possibility of ROM access at Pow ON (factory setting 8 = ON)
  ON: Access ROM when Pow ON
  OFF: Do not access ROM when Pow is ON

· 4-station dip switch SW3: I / O port address, data transfer mode,
　Memory size setting
1-2: I / O port address
　ON-ON: CCX (factory setting) "X" represents 0, 2, or 4.
  OFF-ON: CDX
  ON-OFF: CEX
  OFF-OFF: CFX
3: Data transfer mode
  ON: DMA transfer
  OFF: CPU transfer (factory setting)
　　　　　　　　Factory default settings except when connecting PC-98B55 and PC-MT600B
　　　　　　　　It is used as it is.When using other than factory setting
　　　　　　　　Make sure to turn SW2 8 OFF.
4: Memory size
  ON: When the 98NOTE internal RAM is set to 512KB 
  OFF: When 98NOTE internal RAM is set to 640KB (factory setting)