Chepponis@Cmu-20c@sri-unix (09/06/82)
From: Mike Chepponis <Chepponis@Cmu-20c> Does anybody have any information about designing hard disk interfaces using the Western Digital WD1010 Winchester Disk Controller to implement Seagate's ST506 interface standard? I know I can buy boards for this standard for about $300, but I think I can build it myself for less; the WD1010 spec sheet is sketchy about the extra support circuits required (write precomp, phase lock loop, and data rate oscillator). I'm buying a Western Dynex WD 505 5 1/4" Cartridge Drive (5.0 Megabytes formatted, same size as a 5 1/4" floppy, 5.0 Megabits/second transfer rate, 35 milliseconds average access time, 3600 RPM, +12v @ 2.5 Amps & +5v @ 1.5 Amps 5.0 lbs, and best of all, $495 quantity one!), and I need to know how much more difficult hard disk interfaces are to build than floppy interfaces. Thanks all. Please reply direct to me at chepponis@cmu-20c. -Mike C. -------