Control Data (?) circuit boards
hilpert at cs.ubc.ca
Wed Sep 9 14:32:51 CDT 2015
On 2015-Sep-09, at 10:58 AM, Mike Stein wrote:
> ----- Original Message ----- From: "Paul Koning" <paulkoning at comcast.net>
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
> Sent: Wednesday, September 09, 2015 1:08 PM
> Subject: Re: Control Data (?) circuit boards
>> On Sep 9, 2015, at 1:00 PM, Mike Stein <mhs.stein at gmail.com> wrote:
>> Speaking of Control Data:
>> I have some boards out of (AFAIR) a Control Data Display Controller (OSG 1253/1255), each populated with ~30 10pin TO-5 ICs; they're Fairchild with (house?) numbers such as 115, 116, 117, 118 and what I assume to be date codes (all 3 digits, 7xx), e.g. F 115 728.
>> Any reason why I shouldn't scrap these (after cutting off the gold fingers of course ;-) ?
> I don't recognize 115 etc. as IC part numbers, but 728 or similar 7xx numbers sounds familiar for the old RTL ICs that Fairchild produced in TO-5 cans.
> I don't suppose there's a whole lot of demand for that family, but then again I also suppose there aren't a lot available.
> ----- Reply -----
> Yeah, RTL would be my guess considering the package and the time frame (67/68), but AFAIK Fairchild and Motorola used 700 and 900 (later 9000) numbers and these have 10 pins instead of the usual 8 pins (although power is similarly connected diagonally, i.e pins 5 and 10). Also odd that the numbers are consecutive.
> Anyway, just thought I'd mention them in case someone has one of these displays or can use the ICs.
There were at least 3 types in Fairchild's standard RTL series in 10-pin cans:
9915 - dual 3-in inverting gate
9926 - JK FF
9927 - quad inverter
which would cover logic requirements if the designer were attempting to keep type diversity down.
A lot of Fairchild's standard DTL series was also available in 10-pin cans.
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