Another disk imaging project
ajp166 at bellatlantic.net
Wed Aug 3 10:50:10 CDT 2005
>Subject: Re: Another disk imaging project
> From: Dave Dunfield <dave04a at dunfield.com>
> Date: Wed, 03 Aug 2005 10:53:11 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>>Finally, is the WD2793 able to read northstar horizon floppy disks? If not,
>>then a WD2793-based solution is not general enough.
No, the NS* hard sector format done not use or encode all the marks used by
most FDC chips.
The upside of NS* is that a simple data seperator and a shift register are
all thats needed to read it (look at the board schematics). Most fo the
board is centered on getting the data rate down to something an 8080 can
handle. Data bit rates for NS* are 125 and 250kb/s so it's very slow
relative to what most newer machines can do.
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