Path: utzoo!utgpu!news-server.csri.toronto.edu!qucdn!leek Organization: Queen's University at Kingston Date: Tuesday, 4 Jun 1991 09:54:22 EDT From: Message-ID: <91155.095422LEEK@QUCDN.QueensU.CA> Newsgroups: comp.sys.amiga.misc Subject: Re: Adding an IBM type 3.5" High Density Drive to Amiga References: <1991May7.002625.1696@tplrd.tpl.oz.au> <18730003@hplsla.HP.COM> In article <18730003@hplsla.HP.COM>, tomb@hplsla.HP.COM (Tom Bruhns) says: > >Also, why assume that "new drivers, a memory/bus interface, etc." >are required? If the HD floppy external electronics makes it >look like a standard 1-meg floppy (same data rate and format), but ------ !!! >with more tracks, would the Amiga care (given the apropriate mountlist >entry)? If I built a solid-state external 'floppy', would the Amiga >OS even care how many tracks it had? > Well... The easiest way to hack is to slap a PC/XT style floppy disk inteface onto the expansion bus. In order to remap the High Density floppies to the same data format and different # of tracks, you would need some sort of microprocessor onboard to provide the smarts. I guess you'll also need a floppy controller chip that do the same type of arbitrary format as the Amiga one to talk to the Amiga floppy interface. It might be easier to build a black box to buffer the raw data bits at different clock rates between the Amiga & your HD floppy. A modified trackdisk device has to be able to handle the extra track length. > >PS: Why would someone designing an interface to a stock floppy drive >care about the flux density at the medium? K. C. Lee P.S. Why would someone wanting to design an HD floppy interface when C= already have one for the A3000 ?