AST Advantage! 6066d  (250-0404)    Interrupts         Faxback Doc. # 3528

Interrupt Assignments

Device/Circuit                             Interrupt           Status

8254 counter time                          IRQ 0               Reserved
PS/2 keyboard                              IRQ 1               Reserved
Secondary Interrupt controller cascade     IRQ 2               Reserved
Serial port (COM 2) Fax Modem on 6066      IRQ 3*              Reserved
Serial port (COM 1)                        IRQ 4               Reserved
Audio Adapter (default interrupt)          IRQ 5*              Reserved
Floppy drive interface                     IRQ 6               Reserved
Parallel port                              IRQ 7               Reserved
Real-time clock                            IRQ 8               Reserved
Video vertical retrace (optional)          IRQ 9               Available
Alternate serial port (COM 4)              IRQ 10              Available
Alternate serial port (COM 3)              IRQ 11              Available
PS/2 mouse interface                       IRQ 12              Reserved
Coprocessor                                IRQ 13              Reserved
IDE hard drive interface                   IRQ 14              Reserved
Open                                       IRQ 15              Available

The COM 2 serial port is disabled in setup o the 6066d and is used by the
FAX/modem adapter.

DMA Channel Assignments

Device/Circuit                            DMA Channel

Audio adapter (default for 8-bit PCM)     *DMA 1
Floppy drive interface/ISA bus             DMA 2
Modem                                     *DMA 3
Secondary DMA controller cascade           DMA 4     Unavailable
Audio adapter (default for 16-bit PCM)    *DMA 5
Open                                       DMA 6
Open                                       DMA 7

NOTE:  Unavailable DMA channels are used internally and cannot be
       disabled.

* Available on the 6033s

(JJS/all-12/12/94)