MITS 2SIO serial chip?

From: Richard Erlacher <>
Date: Mon Dec 17 23:57:25 2001

Yup! That's already been pointed out ... I made the choice to use the Western
MFM-capable part back in '78 and never looked back. I let someone else tell me
why, but I never regretted it. The process with the Western part is apparently
the same, though there was something critical that the NEC part didn't do.
Maybe it had to do with altering the gap lengths in order to accomodate an extra
sector, or some such. Of course, possible or not, I never ended up doing that


----- Original Message -----
From: "ajp166" <>
To: <>
Sent: Monday, December 17, 2001 9:02 PM
Subject: Re: MITS 2SIO serial chip?

> From: Richard Erlacher <>
> >won't support, and that's formatting with interleaving. The NEC parts
> seem to
> >be unable to format a diskette with other than strict ordinal sector
> numbering,
> Obviously you know not how the part works. I used to put sectors down on
> floppies with physical skew for CPM using 765/9266/37C65. It was dirt
> simple.
> When the 765 and clones write they want CHRN, All you need to do is make
> R the sector number what ever you want it to be then feed it to the FDC
> when
> doing a format track. What's difficult about that?
> Allison
Received on Mon Dec 17 2001 - 23:57:25 GMT

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