Adaptec 1520A User Guide - Page 32

AHA-1510A/20A Series User's Guide Floppy Disk Controller The floppy controller is enabled by default on the AHA-1522A. Standard floppy drives connected to the AHA-1522A onboard floppy connector are not part of the SCSI bus. These drives are controlled by the non-SCSI floppy controller on the host adapter. WARNING: Be sure to disable any other floppy controllers in your system, such as the controller on the motherboard or non-SCSI controllers. Enabling more than one floppy controllers can cause your system to hang. Optional Host Adapter Settings AHA-1520A/1522A host adapters also have the following optional configuration settings, which you should not change unless you thoroughly understand the consequences of doing so: s Data transfer mode s SCSI Floppy/Floptical s Fast SCSI s Extended BIOS Translation for DOS Drives > 1 GByte Data Transfer Mode AHA-1510A/20A Series host adapters use Programmed I/O (PIO) by default. If you must use the DMA data transfer mode, note the following: s DMA must be enabled by setting pin pair DT on jumper block J5 s The DMA channel must be selected on both jumper blocks J6 and J8. s The DMA channel selected for J6 and J8 must be identical. SCSI Floptical Support This setting enables support for SCSI floppy/floptical drives. This option is available on the AHA-1520A and the AHA-1522A, since SCSI floptical support is provided by the host adapter BIOS. See Appendix B, Floptical Drive Support, for more detailed information. 2-12 AAAAAAAAAAAAAAAAAASPCAAAAAArtuHoiAAArncAAAArtkAAAe-SAAAn1NAAApt5AAAeuD1AAAcmAAA0aAAANtAbeAAAeu:/AAAr2mAAA1:0AAA15bAAAA/1eAAA1rAAA0S8:AAA4/e4AAA90rAAA94i0eAAA1-AAAs08AAAU04AAA,2AAAsR-AAAe0AAAre0'AAAvsAAA.AAAGCAAAuAAAAAAidAAAeAAAAAAAAAEAAACAAAAAANAAAAAADAAAAAAaAAAtAAAePAAA: aAAA1gAAA1AAAe/AAA:2AAA29AAA-/AAA91AAA42AAAAAAAAAAAAAAAAAAAA