Pinout for SED9421

[Allison]

Dwight K. Elvey wrote:
>>From: "Allison" <ajp166 at bellatlantic.net>
>>
>>>Subject: Re: Pinout for SED9421
>>>  From: "Dwight K. Elvey" <dwight.elvey at amd.com>
>>>  Date: Mon, 28 Nov 2005 10:46:28 -0800 (PST)
>>>    To: cctalk at classiccmp.org
>>>
> 
> Hi Allison
>  I'm not contridicting, just pointing out some cases
> to support. As I recall, the N* controller also used
> the synchronous serial chip. I don't know of a case
> that used a async part. All of these were used on
> hard sectored disk.

Nope and I'm sure of is as I'm in the middle to sorting out a
non working MDS-AD3!

>  I don't know of any soft sectored that used serial
> chips. I suspect that it is because these depended
> on using illegal data clocking sequences in order
> to mark sectors. This would require more external
> circuits.

There is nothing to stop that as the data de and can also do a
little majik on those marks. May not make as much sense but
doable.


Allison