Adaptec AHA-1520B Install Manual

Contents

7AHA-1520B Installation GuidePart Number: 511162-00, Rev. A Page 7 of 16Print Spec Number: 495339-00Current Date: 5/30/96Last Modified: May 30, 1996 3:43 pmFile Location: n:\mario\1520b_ig.nec\1520b_ig.frmECN Date: 6/11/95AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAASetting Host Adapter SwitchesThe switch block on your host adapter, is factory set towork in a Plug and Play system. Since resources in aPlug and Play system are assigned automatically, youshould not have to change these settings.If your system is not Plug and Play, you may have tochange the I/O port address and BIOS address settings.The table below lists all possible settings on the switchblock.n Host Adapter BIOS Address—If your system is Plugand Play, the BIOS address is set automatically. Ifyour system is not Plug and Play, you should choosea BIOS address range that does not conflict with theBIOS address range of another device installed inyour system.In order to boot from a SCSI disk drive connected tothe host adapter, a BIOS address must be selected. Ifyou set the BIOS address to BIOS PROM Disabled (setsw1, sw2 and sw3 to On), you disable all BIOS func-tionality (including access to the SCSISelect utility atsystem bootup) and you cannot boot from a SCSI diskdrive.1 Do not use this setting in Legacy/Non-Plug and Play systems.2 If you disable the BIOS PROM, you must run SCSISelect to synchronizethe host adapter’s resource table with your new selection. Synchroniza-tion is automatically performed just by entering SCSISelect.If you wish to disable BIOS functionality and stillhave access to SCSISelect, do not disable the BIOSPROM with the switches. Instead, change the HostAdapter BIOS setting in SCSISelect to Disabled.n Host Adapter I/O Port Address—If your system isPlug and Play, the I/O port address is set automati-cally. If your system is not Plug and Play, you shouldchoose an I/O address range that does not conflictwith the I/O address range of another device installedin your system.Connecting to the LED Connector(Optional) Most computers have an LED disk activitylight on the front panel. If you disconnect the cable fromthe LED connector on the motherboard and connect it tothe LED connector on the host adapter, the LED on thefront panel of the computer will light whenever there isactivity on the SCSI bus.Note: If you are using non-SCSI disk drives (e.g.,IDE), you may not want to connect your com-puter’s LED to the host adapter, since the LEDwill no longer indicate non-SCSI disk activity.Host Adapter BIOS Address sw1 sw2 sw3DC000-DFFFF Off Off OffD8000-DBFFF On Off OffD4000-D7FFF Off On OffD0000-D3FFF On On OffCC000-CFFFF Off Off OnC8000-CBFFF On Off OnInactive1 Off On OnBIOS PROM Disabled 2 On On OnHost Adapter I/O Port Address sw4340-35F Off140-15F On(Open = Off)1 2 3 4OPENLED Connectoron Host AdapterLED Cablefrom MotherboardPin 112-pinLEDCable