12 Sep
2008
12 Sep
'08
3:58 p.m.
Subject: Re: ISO: NEC UPD72070 IC
From: "Chuck Guzis" <cclist at sydex.com
Date: Fri, 12 Sep 2008 12:21:20 -0700
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org
On 12 Sep 2008 at 11:34, Al Kossow wrote:
It in the intel data book page 3-32 (1988 volume2 peripheral with black cover).
I have that datasheet but the scanner is down.
Allison
Very unusual part. It was the only externally
developed floppy controller
Apple ever used that supported GCR. Were you able to find data on it?
In Japanese, a datasheet along with an app note on NEC's website
(http://www.necel.com). Easy enough to suss out in spite of the
chicken scratches. Basically a uPD765 controller with a bunch of add-
ons for the GCR stuff.
I doubt you will be able to find one w/o
unsoldering it from an AV board.
I suspect as much. Maybe there's someone out there with a junker...
Cheers,
Chuck 
13 Sep
13 Sep
8:36 a.m.
On 12 Sep 2008 at 18:58, Allison wrote:
It in the intel data book page 3-32 (1988 volume2
peripheral with black cover).
I have that datasheet but the scanner is down.
You're not thinking of the 82078 are you? 64 pin, but very different
chip, both in pinout and command set. If you've got a part number,
I'll go digging for it, but AFAIK, the NEC part was a special for
Apple--I've never seen it anywhere else.
Cheers,
Chuck
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