c60a-2fe@web-2f.berkeley.edu (Jimmy Kuei) (05/04/90)
I have a 3.5 drive pulled from an IBM and would like to hook it to the external drive port of the A1000. If anyone has the pin assignment for the external drive port, please post them or mail me. c60a-2fe@web.berkeley.edu : - Jimmy
tomb@hplsla.HP.COM (Tom Bruhns) (05/05/90)
c60a-2fe@web-2f.berkeley.edu (Jimmy Kuei) writes:
I have a 3.5 drive pulled from an IBM and would like to
hook it to the external drive port of the A1000. If anyone
has the pin assignment for the external drive port, please
post them or mail me.
Many BBS's have articles on how to do this. It requires a latch for
motor drive and a circuit (very simple) to answer back to the Amiga
that it's an 80 track disk at that address (or alternatively, a 40
track disk). I am assuming that your drive is a 300 RPM drive; if
it's like the 600 RPM ones I picked up, you are probably out of
luck ;-)
If you need more info, mail to me and I'll email some stuff back...
including an iff pic and narrative, for both 5.25 and 3.5 (40 and 80
track) drives. Includes notes on the pits I fell in on the way ;-)
Cheers,
Tom
tomb%hplsla@hplabs.hp.comnew@udel.EDU (Darren New) (05/08/90)
In article <5160097@hplsla.HP.COM> tomb@hplsla.HP.COM (Tom Bruhns) writes: >that it's an 80 track disk at that address (or alternatively, a 40 >track disk). Just to clear things up here... you have sectors, blocks, heads, tracks, and cylinders. cyl = heads times tracks. Amiga floppies are 80 cyls, not 80 tracks. Only old single-sided floppies are 40 tracks. (Jeesh, and I even see commercial disk-editor programs getting this wrong!) -- Darren
amc4919@cec1.wustl.edu (Adam Michael Costello) (05/08/90)
In article <18767@estelle.udel.EDU> new@ee.udel.edu (Darren New) writes: >Just to clear things up here... >you have sectors, blocks, heads, tracks, and cylinders. >cyl = heads times tracks. I thought the number of tracks was the product of the number of heads and the number of cylinders. Could that be what you meant, or am I screwed up? >Amiga floppies are 80 cyls, not 80 tracks. >Only old single-sided floppies are 40 tracks.
new@udel.EDU (Darren New) (05/09/90)
In article <1990May7.210143.851@cec1.wustl.edu> amc4919@cec2.UUCP (Adam Michael Costello) writes: >In article <18767@estelle.udel.EDU> new@ee.udel.edu (Darren New) writes: >>cyl = heads times tracks. >>Amiga floppies are 80 cyls, not 80 tracks. >>Only old single-sided floppies are 40 tracks. >I thought the number of tracks was the product of the number of heads and the >number of cylinders. Could that be what you meant, or am I screwed up? Ok, I screwed up. What I meant to say is that the number of sectors on a cylinder equals the number of sectors on a track times the number of heads. Sorry, but that's just how I think about these things. Hope I didn't confuse anybody any worse. -- Darren