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lither
Joined: 04 Dec 2005
Posts: 1362
Location: Taiwan
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 Posted: Tue Nov 14, 2006 7:08 am Post subject: who made these F2708 |
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hi,maybe this is a stupid question but i am not familiar with eprom and just wondering who made these F2708.
The bottom of the chip is blank.
Are they made by Fairchild ?
thanks in advances!
Lee |
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Tue Nov 14, 2006 8:55 am Post subject: |
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My guess is Fairchild.
But take a microscope and see what's on the die!
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CPUShack
Joined: 16 Jun 2003
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chip68
Joined: 19 Oct 2004
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Location: Central Pennsylvania
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| Posted: Tue Nov 14, 2006 3:40 pm Post subject: |
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Yup, Fairchild. The number "1" next to pin 1 gives it away.
- CMW |
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Elar
Joined: 16 Jul 2003
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Location: Tallinn, Estonia
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| Posted: Tue Nov 14, 2006 3:48 pm Post subject: |
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| chip68 wrote: | Yup, Fairchild. The number "1" next to pin 1 gives it away.
- CMW |
This is also Fairchild?
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CPUShack
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chip68
Joined: 19 Oct 2004
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Location: Central Pennsylvania
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| Posted: Wed Nov 15, 2006 1:07 am Post subject: |
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| Elar wrote: | | This is also Fairchild? |
Huh. All I know is I've only ever seen that package (until now) used by Fairchild:
.jpg)
(So all else being equal, in the absence of any other identifying information, that "1" is still more likely indicative of a Fairchild part.) >> well, maybe not
Btw, as far as third-parties go, back in the day many fabs had their own proprietary packages. AMI and TI immediately spring to mind.
- CMW
Last edited by chip68 on Wed Nov 15, 2006 11:37 am; edited 1 time in total |
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Wed Nov 15, 2006 1:52 am Post subject: |
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Looking at John's EPROM collection I see a few Intel 1702's and 2708's with that same package, and I'm reminded that Bob Noyce and Gordon Moore were former Fairchild employees...
Does anyone have an example that *isn't* Fairchild or Intel? Just curious.
- CMW |
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lither
Joined: 04 Dec 2005
Posts: 1362
Location: Taiwan
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| Posted: Wed Nov 15, 2006 2:06 am Post subject: |
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| wepwawet wrote: | My guess is Fairchild.
But take a microscope and see what's on the die! |
Thank all of you for comments !
I think check with a microscope is a good idea but I couldnt get a microscope now . I have try a magnifier today . but failed to have any clue.
I got these from one lot of the late 70 chips selling for goldscrap ( together with the white 9511) . I didnt collect the EPROM seriously. If someone have such facility and are willing to take a picture and show us who made it , i will let the purple one go freely (of course postage not free )
Regards!
Lee |
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CPUShack
Joined: 16 Jun 2003
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wepwawet
Joined: 18 Mar 2004
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Location: Seligenstadt - Germany
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| Posted: Wed Nov 15, 2006 5:33 am Post subject: |
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| The Raytheon 2901 clone has the 1 as well |
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chip68
Joined: 19 Oct 2004
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Location: Central Pennsylvania
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| Posted: Wed Nov 15, 2006 11:38 am Post subject: |
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Yeah, I've since found examples from OKI, National, TI, and AMD as well... (All 8080's.) So I guess you can ignore what I said about the "1" being a dead giveaway. 
- CMW |
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metalmaker
Joined: 06 Dec 2004
Posts: 161
Location: St. Louis, MO, USA
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| Posted: Wed Nov 15, 2006 7:10 pm Post subject: |
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I think it is likley ia Fujitsu "F" instead of Fairchild. Seems like Fujitsu "F" is usually square and Fairchild "F" is usually script style like in pictures from Chip68.
Edit - nevermind - I have now found some Fairchild chips with square F on a Plastic F3850, so style of F does not make difference between Fairchild and Fujitsu if the F is square.
MM
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