From: cctalk Digest, Vol 117, Issue 58
> Date: Mon, 27 May 2013 22:21:25 +0100 (BST)
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> To: cctalk at classiccmp.org
> Subject: Re: Tektronix / AMI custom chips
[snip]
>
>>
>>
>> In article <51A25503.8090002 at bluewin.ch>,
>> Jos Dreesen <jdr_use at bluewin.ch> writes:
>>
>> > The spare parts box that was part of a tek4052 deal has several Tektronix spe
>> cific 40 pins DIL, date around 1973
>> >
>> > These are
>> >
>> > 156-0235-00 C8684
>> > 156-0238-00 C1840
>> > 156-0236-00 C1841
>> > 156-0243-00 C1842
>> >
>> > also a MOS MCS1020
>> >
>> > Anyone know what these were from ( not the 4052), maybe a tek 31 ?
>>
>> They are almost certainly ROM chips. I can't think of any other Tek
>
> Were there any 40-pin ROM chips at that time? I can't think of any.
>
> My guess is that they're part of the processor in a Tekky 21 or 31, but
> it's only a guess. I do not know for sure.
>
>> sourced digital chips except ROMs in the circuit diagrams I've
>> studied. I think Tek did make a fair number of their own analog
>> chips in that time frame, though.
>
> What about the readout/display chips in a 7000 series 'scope? Or are
> those later?
>
> -tony
>
I posted a copy of the original question to the TekScopes list on
Yahoo. A list-member, David, quickly responded:
"I think all of these are Tektronix designs fabricated by AMI (American
Microsystems, Inc.) for the Tektronix Model 31 Electronic Calculator.
My parts book just indicates that they are MOS logic and the
156-0236-00 C1841 is a memory.
http://www.oldcalculatormuseum.com/tek31.htmlhttp://www.oldcalculatormuseum.com/s-tek31.html"
Bob
