[rescue] Anybody remember MFM? (Durango Poppy II problem)
mfree80286 at adelphia.net
Wed Aug 6 09:31:41 CDT 2003
The olden way was to send some bits to a certain port on the MFM controller
card and that would set the card to low-level format the drive.
Two connectors and a 50 pin.... are you sure it's not 2 ~16's and a 34? that
would be the normal M.O. for an MFM drive controller, IIRC the 34 is the
data line and the two 16's are drive control lines, one for each drive.
----- Original Message -----
From: "Curtis H. Wilbar Jr." <rescue at hawkmountain.net>
To: <rescue at sunhelp.org>
Sent: Wednesday, August 06, 2003 10:22 AM
Subject: Re: [rescue] Anybody remember MFM? (Durango Poppy II problem)
> >From: Dave McGuire <mcguire at neurotica.com>
> >On Tuesday, August 5, 2003, at 11:19 PM, Curtis H. Wilbar Jr. wrote:
> >> Low level formatting is probably done through some utility, possibly
> >> booted off of a diagnostic disc, or since this is PC based, in a BIOS
> >> on the controller card. This would be accessed via booting dos, going
> >> into debug, and executing g=dc00:5 or something like that (I think that
> >> address works for one of my ESDI cards... or was it c800:5 ??? been
> >> a long time).
> > The debug command would be "g=c800:5". My God why do I remember that.
> >>>>> The drive is connected to a board from 'Molecular Systems' which
> >>>>> has 3
> >>>>> connectors: 2 for the MFM drive and a 50 pin connector. I am
> >>>>> hesitant
> >>>>> to
> >>>>> try out if it's SCSI. Were combined MFM/SCSI cards normal in the old
> >>>>> days?
> >>>> Umm...not that I can recall but it _might_ be SCSI-1. If it is
> >>>> you'll
> >>>> probably not find a drive that will run on that connector.
> >>> Why not? SCSI-2 drives should work on a SCSI-1 controller?
> >> If it is SCSI... it could be SASI.
> > He said there's an ISA bus in there...SASI predates ISA by a good
> >long time; I'd be pretty surprised if it were SASI. Most (all?) SASI
> >hard drives were 8".
> In the SASI and early SCSI days, the common thing to do was to have
> a SASI (or later SCSI) host interface and a bridge controller to MFM,
> RLL, or ESDI. When SASI and early SCSI came through there were little
> to no SASI/SCSI devices.... as time went on, the way of the bridge
> controller went away and was replaced with the electronics on the
> The key here is to do carefull google searches for the host controller
> and the bridgeboard .... it may turn some information up. There IS a
> way to low level format the hard drive.... the big question is how....
> > -Dave
> >Dave McGuire "You don't have Vaseline in Canada?"
> >St. Petersburg, FL -Bill Bradford
> >rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
> -- Curt
> Curtis Wilbar
> Hawk Mountain Networks
> rescue at hawkmountain.net
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