[sebhc] Hard-sectored disks
bill malcolm
wm65805 at hotmail.com
Fri Feb 9 10:37:30 CST 2007
Sorry the Apple II did not use soft sectored disks -- not MFM and does
not use sector hole.
bill ..
----- Original Message -----
From: "Dave Dunfield" <dave06a at dunfield.com>
To: <sebhc at sebhc.org>
Sent: Friday, February 09, 2007 6:59 AM
Subject: Re: [sebhc] Hard-sectored disks
>
> > >the Apple II used 16 hole hard sectored disks. I presume it would at
least
> > >be a major undertaking to get these to work on Heath hard sectored
setups.
> > >At a minimum it would seem to require a rewrite of the H17 ROM.
> >
> > It did? I always thought Apple II disks were soft sector, though the
recorded data format was
> > unusual (not FM or MFM, but rather pulse width encoding).
>
> The Apple-II was soft-sector, and didn't use the sector hole - that is why
you could just
> cut the WP notch and flip a diskette over without having to punch the
index hole.
>
> > Northstar computers used 16-hole hard sectored disks.
>
> No, NorthStar uses 10-sector diskettes (physically the same as H17
diskettes, although
> the actual format is different)
>
> Dave
>
> --
> dave06a (at) Dave Dunfield
> dunfield (dot) Firmware development services & tools: www.dunfield.com
> com Collector of vintage computing equipment:
> http://www.classiccmp.org/dunfield/index.html
> --
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