Tim's own version of the Catweasel/Compaticard/whatever

From: allisonp_at_world.std.com <(allisonp_at_world.std.com)>
Date: Wed Jul 5 07:59:26 2000

> As Chuck pointed out, maybe the fact that this is quarter-century-old
> technology put together with quarter-century-old construction and design
> techniques makes it less accessible to some of the younger members
> of this list. Maybe the way to make it more accessible to them is to put
> the circuitry on a CPLD, I dunno, I think it's fine as it is.

It's compatable with my 500ft deep junkbox. Likely if I built it the
parts would be 25 years old too. ;)

> tend to implicate the design as being on the naively simplistic side, too :-).

Oh, it doesn't bust, rust or collect dust then.

> I will admit, MFM *does* require at least twice the timing resolution of FM.
> I once got in a small argument with some other members of this list about
> AC circuit design of MFM vs FM data recovery circuits. IIRC, they were
> insisting that MFM did come "for free" if you had the frequency response
> necessary for FM at half the data rate. My point was that it
> wasn't the max pulse frequency which made life difficult, it was the phase
> response (finding where the pulse occured in the window) that was the tough
> point.

Also since precomp ranges from .0625uS to as long as .375uS the ability
to slice a bit finer is a desireable thing.

Allison
Received on Wed Jul 05 2000 - 07:59:26 BST