IF-55B (TEAC)

C bus bus master SCSI board.Two x 3 jumper switches and 2 x 4 stations on the board
There is also a jumper switch, two 8-deep dip switches and one 5-deep dip switch.

・ 2 x 3 jumper switch JP1: Supply of terminator power (Factory setting: 3-5,
　4-6 shorts)

・ 2x4 jumper switch JB1: DMA control signal priority (factory setting: 3-6,
　4-5 shorts)
　※ ASCII book section edition, PC-98 series peripheral equipment super tune up (1994
　　In the figure on page 193 of the year issue, it is a short between 4-6, but an error between 4-5
　　Will.

・ 8-station dip switch SW1: SCSI-ID, interrupt level, DMA channel setting
1-2-3: SCSI-ID setting
　0FF-0FF-0FF: ID = 0
  OFF-OFF-ON: ID = 1
  OFF-ON-OFF: ID = 2
  OFF-ON-ON: ID = 3
  ON-OFF-OFF: ID = 4
  ON-OFF-ON: ID = 5
  ON-ON-OFF: ID = 6
  ON-ON-ON: ID = 7 (factory setting)
4-5-6: Setting interrupt level
　OFF-OFF-OFF: INT 0
　ON-OFF-OFF: INT 1 (factory setting)
　OFF-ON-OFF: INT 2
  ON-ON-OFF: INT 3
  OFF-OFF-ON: INT 5
  ON-OFF-ON: INT 6
7-8: DMA channel setting
　OFF-OFF: DMA # 0
  OFF-ON: DMA # 2
  ON-OFF: Setting prohibited
  ON-ON: DMA # 3 (factory setting)

・ 8 stations dip switch SW2: Local memory address, setting of main unit model
1-2-3: Local memory address (normal) setting
　OFF-OFF-OFF: D0000h to D0FFFh
　ON-OFF-OFF: D2000h to D2FFFh
　OFF-ON-OFF: D4000h to D4FFFh
　ON-ON-OFF: D6000h to D6FFFh
　OFF-OFF-ON: D 8000 h to D 8 FFF h
　ON-OFF-ON: DA000h to DAFFFh
　OFF-ON-ON: DC000h to DCFFFh (factory setting)
　ON-ON-ON: DE 000 h to DEFFF h
4-5: Setting of local memory address (high res)
　OFF-OFF: E8000h to E8FFFh
　ON-OFF: EA000h to EAFFFh
　OFF-ON: EC000h to ECFFFh (factory setting)
　ON-ON: EE000h to EEFFFh
6-7: Setting of machine model
　OFF-OFF: PC-98XA
  ON-OFF: CPU is the model of 8086 / V30
　OFF-ON: Normal / High res combined machine
　ON-ON: CPU model 286/386/486 (default setting)
8: Do not change (factory setting ON)

・ 5 stations dip switch SW3: I / O port address, transfer mode, at boot
　ID display ON / OFF, boot mode setting
1-2: I / O port address setting
　OFF-OFF: CCxh (factory setting)
　ON-OFF: CDxh
　OFF-ON: CExh
　ON-ON: CFxh
  (x represents 0, 2, 4)
3: Transfer mode setting
　ON: Bus master transfer (factory setting)
　OFF: DMA transfer
4: Set ID display ON / OFF at H boot
　ON: ON (factory setting)
　OFF: OFF
5: Boot mode setting
　ON: Fast boot mode (factory setting)
　OFF: Standard boot mode