Adding a 3rd floppy to an old PC SCSI controller

From: cclist at sydex.com To: cctalk at classiccmp.org Date: Tue, 1 Apr 2008 10:14:38 -0700 Subject: Re: Adding a 3rd floppy to an old PC SCSI controller Dwight asked: Good point--but the datasheet states right in the opening remarks that it can be connected directly to the disk drive with its own internal 48 ma buffered output and schmitt inputs. The datahseet's easy to find on the web--several places have it. Here, for example: http://www.tranzistoare.ro/datasheets2/36/366021_1.pdf I like the DP8473--unlike the Intel 82077AA and later chips, it still knows how to do FM correctly--and will even write 128 byte sectored MFM, which is something that Intel was ever able to do. Don Maslin and I worked through a pile of FDC chips before we found this one. I think there was a Future Domain card (1680?) that brought all 4 floppy drives out to 2 headers--and I certainly could have added one to do that myself for 4 drives, but 3 on one cable was the easiest. Cheers, Chuck