Pinout for SED9421

[Allison]

>
>Subject: Re: Pinout for SED9421
>   From: "Chuck Guzis" <cclist at sydex.com>
>   Date: Fri, 25 Nov 2005 13:25:49 -0800
>     To: cctalk at classiccmp.org
>
>On 11/25/2005 at 1:51 PM woodelf wrote:
>
>>Just for the heck of it,  got a schematic and a prom listing?
>>Did anybody ever use a serial chip and a data separater
>>rather than a floppy disk controler?
>
>I've done it on lashups to read very oddball floppies.  A 2651 in sync mode
>will go to something like 600KHz or 1MHz data rate.
>

The commonly used 2601 USRT was common, also the Z80 SIO in sync mode
or the NEC d7201(8274) as they were faster. 

Allison