PORTIBM PC Portable (uses same BIOS as XT) 035A-035B - Adaptec AH1520 jumper settings

035A  R	  I/O channel setup (see #P0625)
035B  R	  transfer mode setup (see #P0626)


Bitfields for Adaptec AH1520 channel setup jumper settings:
Bit(s)	Description	(Table P0625)
 7	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. parity disabled
 6-5	DMAsee Direct Memory Access channel (00 = channel 0, 01 = 5, 10 = 6, 11 = 7)
 4-3	IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. number (00 = IRQ9, 01 = IRQ10, 10 = IRQ11, 11 = IRQ12)
 2-0	SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer.	A host adapter connects the SCSI bus to the computer's own bus.  See also ESDI, IDE. ID
SeeAlso: #P0626


Bitfields for Adaptec AH1520 transfer mode setup jumper settings:
Bit(s)	Description	(Table P0626)
 7	DMAsee Direct Memory Access transfer mode (clear for PIO)
 6	boot enabled
 5-4	boot type
	00 ???
	01 boot from floppy
	10 print configured options
	11 boot from hard disk
 3	enable sync negotiation
 2	enable target disconnection
 1-0	unused???
SeeAlso: #P0625