Pinout for SED9421

[Allison]

>
>Subject: Re: Pinout for SED9421
>   From: shoppa_classiccmp at trailing-edge.com (Tim Shoppa)
>   Date: Fri, 25 Nov 2005 16:56:16 -0500
>     To: cctalk at classiccmp.org
>
>"Peter C. Wallace" <pcw at mesanet.com> wrote:
>
>> On Fri, 25 Nov 2005, woodelf wrote:
>>
>> > Allison wrote:
>> >
>> >> Either that a Dflop(74LS74), hex D-latch(74LS174) and 32x4 prom(74LS288).
>> >> 
>> >> 
>> > 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?
>>
>> Heathkit did with their H89 hard sectored floppy controller....
>>
>> >
>>
>> Peter Wallace
>>
>
>Also Ohio Scientific, I think that was with an async UART? (Don't
>know for sure, but I do know the best way to get the correct information
>is to post incorrect information!)
>
>Tim.

I think the part they used was an USART as in async, bisync, and HDLC/.x25
kinda thing.


Allison