Path: utzoo!utgpu!attcan!uunet!cbmvax!grr
From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.sys.amiga.tech
Subject: Re: using Kodak 3.3M/6.6M floppy drives
Message-ID: <4417@cbmvax.UUCP>
Date: 4 Aug 88 06:48:43 GMT
References: <423@vedge.UUCP>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 23

In article <423@vedge.UUCP> lai@vedge.UUCP (David Lai) writes:
> I originally posted a message re: using the Kodak 6.6M floppy disk
> drive in comp.sys.amiga.  I now have new information on it, and seeing
> it is getting a little more technical, I've moved it to .tech.
> 
> The drive looks like it'll work with the amiga except for 1 thing, the
> motor speed is 600 RPM (about twice the speed of the amiga's 3.5").  The
> data timing I beleive is the same (500 ns. per bit, MFM), however the index
> pulses now arrive at 100ms intervals.  The question is: can the Amiga's
> internal disk controller (part of a custom chip), be able to handle
> reading and writing tracks at 600rpm ... or is too
> much hardware/software dependant on the slower speed (360 rpm, 166ms) drives.?
> Is the index pulse used at all?  If so, will the electronics sync up
> to 100ms index pulse intervals?

The built-in disk controller function in the Amiga chipset is limited
to the standard 3.5" floppy data rate.  Anything faster has to either
have a SCSI interface, or you either have to go thru the PC bus or
design your own controller card.
-- 
George Robbins - now working for,	uucp: {uunet|ihnp4|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@uunet.uu.net
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)