[Coco] [Color Computer] I.C. Identification

[jdaggett at gate.net]

Okay

The " SMC90142L"  is an internal part number most likely generated by Motorola. 
The "L" suffix designates that the package is cerdip package. This part number is 
coded and generated when a customer requests an IC that is not to any off the shelf 
specifications or is a custom partt. This number Motorola assigns to the customer 
and the fabrication lab knows what mask sets and function the IC is to have. 

The "8040330" marking is most likely Tandy's internal part number markings.
It could also be used by Motorola for either one or all of the following; mask set ID, 
fab location, or packaging facility. 
 
Finally "8221" is the four digit date code. 1982 21st week.

As for what the part does that is difficult to say. This could be a custom IC to a 
standard off the shelf LSTTL gate that has special voltage and/or temperature range 
performance. 

james

On 15 Aug 2005 at 16:34, Dave wrote:

To:             	ColorComputer at yahoogroups.com
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Date sent:      	Mon, 15 Aug 2005 16:34:28 -0000
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> I have eight I.C.'s from Tandy / Motorolla that are 16 pin dip and
> ceramic with gold tops.
> 
> They look mil-spec in construction.
> 
> Silkscreen reads SMC90142L 8040330 8221
> 
> These are odd as they contain both the Tandy and Motorola symbols
> also.
> 
> Any ideas?
> 
> Cheers Dave
> 
> 
> 
> 
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