Help Identifying Vintage Logic ICs

[RetroHackShack]

I was recently lucky enough to find some old (early 70s) wire wrap boards loaded with interesting ICs. I am pretty sure these in particular are a series of logic chips, but I can't find any information on them. Does anyone recognize them?

Update: Here are the ones I have been able to confirm so far.
55001 = 7400
55002 = 7402
55003 = 7404
55005 = 7410
55007 = 7430
55008 = 7442
55010 = 7450
55011 = 7474
55019 = 74179
55023 = 73153
55024 = 74161
55028 = 74164
55029 = 7454
55032 = 7401
55034 = 7440

[Benta]

Well, they're from Fairchild and seem to be aerospace parts.

[schmitt trigger]

If you can't find any information, you might send them to user Noopy for some die pictures!

By the date code, could they be some ancient DTL or RTL logic?

EDIT; my previous assumption may be unlikely, as Fairchild's DTL family was the 930-series.

[coppice]

Interesting. The sequential numbers make them seem like some kind of chip set, yet one stands out for its plastic package.

[RetroHackShack]

The other chips on this particular board are 74 series logic, so I am assuming these are logic chips, too. If anyone is interested in some vintage gold ceramic IC porn here is a picture of one of the other boards that is full of Intel 1101 memory. 

[retiredfeline]

I can't find any mention of "55xxx" series logic in Fairchild catalogs on bitsaver, so I think they are custom parts. Also in 1970 Fairchild was making 74 series logic so they would have functions not available in standard parts.

[RetroHackShack]

OK. Not sure why I didn't think about trying this before. I put them through the logic IC identifier on my Retro Chip Tester. The exact 74 series match varied, but the function was consistent. No guarantee that these are 100% accurate.

55001 - 2 Input NAND gate
55002 - 2 Input NOR gate
55003 - Inverter
55005 - 3 Input NAND gate
55006 - 4 Input NAND gate
55007 - 8 Input NAND gate
55011 - Dual D-type Pos Edge Flip Flop
55016 - Dual J-K Flip Flop
55025 -

I will continue to update this list if I find more chips in case it will help someone else.

[EPAIII]

Flip then over and see if there are any numbers on their bellies. I have seen chips with OEM numbers on top and the more common number on the bottom.

[RetroHackShack]

I found some ICs on another board that were dual-marked (see pic), so I can confirm some more of these.

[schmitt trigger]

The other chips on this particular board are 74 series logic, so I am assuming these are logic chips, too. If anyone is interested in some vintage gold ceramic IC porn here is a picture of one of the other boards that is full of Intel 1101 memory. 

Any clue what this board function was? Or what product was it installed on?

[RetroHackShack]

I wish I did. Whatever it was it required a lot of logic and memory. The boards are marked "Datum" and have some assembly numbers but no names or model numbers.

[AVGresponding]

I wish I did. Whatever it was it required a lot of logic and memory. The boards are marked "Datum" and have some assembly numbers but no names or model numbers.

The "Datum" mark is going to be a positioning marker, for use during assembly.

[ebastler]

I wish I did. Whatever it was it required a lot of logic and memory. The boards are marked "Datum" and have some assembly numbers but no names or model numbers.

The "Datum" mark is going to be a positioning marker, for use during assembly.

And all lettering in the copper layer ("Datum" as well as the part numbers) will be referring to Augat's generic wire-wrap board, not to the specific circuit that was built on it. Any labelling referring to that specific circuit would be on stickers, or hand-written or printed onto the PCB, I would expect.