Signetics N8251 source?

[Karl-Wilhelm Wacker]

I have looked at the pinout, it is different, but you can use a method 
called "dead-bug"
to wire the 7442 in place of the n8251.

I've attached the spec sheet for the n8251 to this email.

Karl

----- Original Message ----- 
From: "Karl-Wilhelm Wacker" <kwwacker at ptd.net>
To: "General Discussion: On-Topic and Off-Topic Posts" 
<cctalk at classiccmp.org>
Sent: Sunday, July 24, 2016 1:13 PM
Subject: Re: Signetics N8251 source?


> Mattis:
>
>  By the description, it is a 1 of 10 decoder chip.
>
>  Have you looked to see if it pinout compatable
> with a 7442?
>
> Karl
>
> ----- Original Message ----- 
> From: "Mattis Lind" <mattislind at gmail.com>
> To: "General Discussion: On-Topic and Off-Topic Posts" 
> <cctalk at classiccmp.org>
> Sent: Sunday, July 24, 2016 5:01 AM
> Subject: Signetics N8251 source?
>
>
>> After successfully repairing the G231 module of the MM11-L set I 
>> continued
>> with the next one. This one was not able to access addresses ending 0100
>> (binary). Luckily it was not the transistors arrays that were bad but the
>> selector chip. A Signetics N8251 chip.
>>
>> I found a source on ebay at $4.95 each plus $13 shipping. A little bit to
>> much for my taste (although I could make an offer)
>>
>> Anyone know of a cheaper source? I could use five or ten maybe.
>>
>> /Mattis
>