Heathkit Part 443-843 40 Pin IC

[LEON WENDLER]

They are MC6820 or 6821 it was used with the et3400
heathkit. use a google search for SC44074PK it is # 3
on the list
leon @ technology systems

--- Don <don at D8APRO.COM> wrote:

> Anyone have any Idea what a 443-843 might be?  I
> bought an ET-3400 from
> eBay, and it was stuck on the solder-less
> breadboard.  I don't have any
> reference of this part in any of my over 800
> manuals, or even in the
> Heathkit Engineering Parts Master File.  It just
> skips right over that part
> number.  It's a Plastic 40 Pin IC manufactured by
> Motorola with a custom
> part number of SC44074PK, and of course the Heathkit
> part number of 443-843.
> I don't see any bottom markings on the chip.
> 
>  
> 
> I was just curious what it might be.
> 
>  
> 
> Thanks
> 
>  
> 
> Don
> 
>  
> 
> 
>
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