Adaptec AHA-1520A/1522A SCSI Host Adapter
View of the controller.
Default settings are in Bold or are selected by a (Default) or (Optional)
View of J5.

Jumper Block J5

  • DT: Data Transfer Mode
  • (Optional Setting): Jumpered: Use DMA (Direct Memory Addressing) mode. (Not supported under DOS or Windows)
  • (Default Setting): Open: Use PIO (Programmed I/O) mode.
  • BT: Boot Select
  • (Default Setting): Jumpered: Boot using the Host Adapter BIOS.
  • (Optional Setting): Open: Do not boot from Host Adapter.

  • M0: Reserved (no jumper)
  • M1: Fast SCSI
  • (Default Setting): Jumpered: Fast SCSI On.
  • (Optional Setting): Open: Fast SCSI Off.
    •
  • SN: Synchronous Negotiation
  • (Default Setting): Jumpered: Synchronous Negotiation On.
  • (Optional Setting): Open: Synchronous Negotiation Off.
    •
  • DN: SCSI Target Disconnects
  • (Default Setting): Jumpered: Permit Disconnects.
  • (Optional Setting): Open: Do Not Permit Disconnects.
    •
  • (1st) R-: Removable SCSI Support
  • (Optional Setting): Jumpered: Enable SCSI Floppy/Floptical Support.
  • (Default Setting): Open: Disable SCSI Floppy/Floptical Support.
    •
  • (2nd) R-: 1GB+ Support (Requires v1.20 BIOS & rev. A or B board)
  • (Optional Setting): Jumpered: >1GB Support.
  • (Default Setting): Open: <1GB Support.
    •

    • View of jumper block J6.

    Jumper Block J6

  • SD: SCSI ID Selection
  • (Default Setting): All 3 SD's Jumpered: SCSI ID#7.
  • (Optional Setting): Any other SCSI ID# (The SD jumpers are numbered 1, 2, & 4, starting with the one closest to jumper R-).
    •
  • IC: Host Adapter IRQ
  • (Optional Setting): IRQ#9: No Jumpers.
  • (Optional Setting): IRQ#10: 1st IC Jumpered (Next to SD).
  • (Default Setting): IRQ#11: 2nd IC Jumpered (Next to DC).
  • (Optional Setting): IRQ#12: Both ICs Jumpered.
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  • DC: DMA Channel
  • (Default Setting): DMA Channel #0: No Jumpers.
  • (Optional Setting): DMA Channel #5: 1st DC Jumpered (Next to IC).
  • (Optional Setting): DMA Channel #6: 2nd DC Jumpered (Next to SP).
  • (Optional Setting): DMA Channel #7: Both DCs Jumpered.
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  • SP: Parity
  • (Default Setting): Open: Parity Enabled.
  • (Optional Setting): Jumpered: Parity Disabled.

    • J7: Floppy Drive

  • (Default Setting): Jumpered: Floppy Enabled.
  • (Optional Setting): Open: Floppy Disabled.

    • View of Jumper Block J8.

    Jumper Block J8 (Used only when DMA is enabled on Jumper Block J5, Jumper DT)

  • (Optional Setting): (D0 & D0): DMA Channel #0.
  • (Optional Setting): (D5 & D5): DMA Channel #5.
  • (Optional Setting): (D6 & D6): DMA Channel #6.
  • (Optional Setting): (DR & DA): DMA Channel #7.
  • Note: You must select the same DMA channel as set on Jumper Block J6, Jumpers DC.

    • View of Jumper Block J9.

    Interrupt Selection

  • (Optional Setting): I2: Jumper for IRQ#12.
  • (Default Setting): I1: Jumper for IRQ#11.
  • (Optional Setting): I0: Jumper for IRQ#10.
  • (Optional Setting): I9: Jumper for IRQ#9. (Not recommended for use with Windows 3.x.)
  • Note: These setting s must correspond with the settings on Jumper Block J6, Jumpers IC.

    • AL: Port Address

  • (Default Setting): 340h: Open.
  • (Optional Setting): 140h: Jumpered.

    • BIOS Address

  • (Optional Setting): C8000-CBFFF: No Jumpers.
  • (Optional Setting): CC000-CFFFF: Jumper (J4).
  • (Optional Setting): D8000-DBFFF: Jumper (J6).
  • (Default Setting): DC000-DFFFF: Jumper (J6) & (J4).

    • BIOS Enable

  • (Optional Setting): BIOS Disabled: No Jumper.
  • (Default Setting): BIOS Enabled: Jumper (BE).

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