> From: Ole Juul <[EMAIL PROTECTED]>
> Chad A. Fernandez wrote:
> > Is there a way to easily tell the difference between an
> > RLL and MFM controller? I always thought they were
> > compatible...sort like SCSI 1 and SCSI 2.
> I've never noticed any obvious visual difference in the
> controller cards. I think you either have to try it out,
> or check out the model number of the card. Maby there's a
> certain chip to look for. I don't know.
> I bet there's others on this list who can fill us in on
> this. Mike Webb, or Brent Reynolds perhaps? (hint, hint)
I agree that I've never noticed a visual difference between MFM and RLL
controllers per se. You need to know the manufacturer/model number (which
should be on the card someplace) and then check it at a place like TheRef
<http://theref.c3d.rl.af.mil/> or the manufacturer's web site.
Or else you could put the controller in a PC, hook it up to an MFM/RLL drive
(one where there's no data you want to keep!), low-level/FDISK/format it and
see what you get. If you do that with an ST-225 and get 32MB, you have an RLL
controller. If you get 20MB, you have an MFM. That's what I had to do one
time when I could get no details on the controller.
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