Defining Disk Image Dump Standard

My data sheet makes it clear that the device uses both FM and MFM, but only supports up to 250Kbps rates. it says, "With the exception of the Enable Precomp/Ready line, the WD1773 is identical to the WD1770 Controller." It also says "Single (FM) and Double (MFM) density." The fact that Western left off the MO (motor-on) pin in favor of that enable Precomp/ready seems to suggest that the device just might be capable of handling 8" drives. I wonder if it can handle the clocks appropriately. I've never seen one of these puppies. It would be interesting to know how one is expected to use the precomp enable (/TG43 on a 179x) for anything useful if the data is internally generated. That may explain why I've never seen one. The offer a READY input on that same pin, for use on step and read operations. I don't know how one is supposed to steer those two signals since the associated signals are internally used from the same pin. It's a good thing that sheet says "PRELIMINARY" at the top. I've checked to make certain I haven't got a sample or two stashed away somewhere. Dick ----- Original Message ----- From: allisonp <allisonp(a)world.std.com> To: <classiccmp(a)classiccmp.org> Sent: Tuesday, May 30, 2000 3:57 PM Subject: Re: Defining Disk Image Dump Standard FDC