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wonderwulf
Joined: 12 Nov 2012
Posts: 3
Location: United States
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 Posted: Mon Nov 12, 2012 5:32 pm Post subject: Vintage Logic Chips for Identification |
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I've got a bunch of these guys in a bag with a bunch of late 60s/early to mid 70s logic ics (I'm assuming that's what these guys are). I'm having no luck googling the numbers on the cases so I figured I'd post and see if anyone can give me a lead on what I should be searching for? Sorry for the not so great pictures...
Last edited by wonderwulf on Mon Nov 12, 2012 5:41 pm; edited 1 time in total |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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wonderwulf
Joined: 12 Nov 2012
Posts: 3
Location: United States
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| Posted: Mon Nov 12, 2012 5:43 pm Post subject: |
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| Thanks! They both have 16 pins. |
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magictom
Joined: 14 May 2009
Posts: 2281
Location: Hawaii
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| Posted: Mon Nov 12, 2012 6:21 pm Post subject: |
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I remember reading that a long time ago TI used the "TMC" prefix for custom MOS ICs ...
TMC = "TI MOS Custom"? |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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wonderwulf
Joined: 12 Nov 2012
Posts: 3
Location: United States
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| Posted: Mon Nov 12, 2012 7:08 pm Post subject: |
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here's a picture of a better example of the Motorola chip and an example of a TI chip with the "TMS" marking, The 70xx number at the bottom of these is just a date code right? Provided that is true, the common theme among all the ceramic chips is the mark "MM03". Does that mean anything to anyone?
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kosmokrator
Joined: 03 Jul 2008
Posts: 4085
Location: Athens-GR
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| Posted: Tue Nov 13, 2012 12:59 pm Post subject: |
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yes 70xx is datecodes....
nice early chips |
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mtx500
Joined: 21 Nov 2003
Posts: 117
Location: Nuremberg, Germany
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| Posted: Thu Nov 15, 2012 3:18 am Post subject: |
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| The second picture shows an IC from National Semiconductor (the wave logo). The look of this IC and the number 1789 rang a bell: In the 1980s I used National Semiconductor 1489 ICs (Quad Line Receiver) for RS 232 Interface. Maybe the 1789 is a variant of this IC? |
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