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