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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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 Posted: Thu Sep 28, 2006 9:44 am Post subject: Signetics 8008 Intel-clone? |
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I need your opinion on this chip guys:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260029598779
Could this really be an Intel 8008-clone? Maybe a
slightly modified version in a different package?
I own the same chip from Signetics and
did some measurements with my multimeter.
I could indeed identify eight pins which seems
belonging to a bi-directional(!) data-bus....
Thanks for your help,
Doccy
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Thu Sep 28, 2006 10:23 am Post subject: |
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Absolutely not an 8008 clone. For one thing, Signetics never made one. For another, the package and pin count are wrong. Also, that's an HP-numbered part, and a C8008 CPU is p/n 1818-1221. Finally, all of the 8000-series Signetics chips I'm familiar with (except for the MP8080) are bipolar, while the Intel 8008 is a MOS design.
From the bidding, it looks like all one has to do is put the word "CPU" in a listing and all sense of reason goes out the door... In which case, I've got a Motorola MC4004 "CPU" and a bridge in Brooklyn for sale. 
BTW, you can't identify anything about a chip with a multimeter.
- CMW |
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Thu Sep 28, 2006 11:39 am Post subject: |
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Thanks for the informations. Of course for any early cpu
a different pincount than on the original would be very atypical.
In fact I don`t know any early cpu in packages with diverse pincounts.
I thought more in the way of a modified 8008 and maybe with external
units which have been integrated ondie (yes, little bit utopic).
But I would not go the way to say Signetics never made
a 8008-clone only because I never saw one before.
Except I was a Signetics-insider
Please let me know if you would sell your Motorola MC4004 
For my multimeter I only can say it does make a great job.
/doccy
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Mixeur
Joined: 06 Jan 2005
Posts: 4038
Location: Sochaux, France
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Thu Sep 28, 2006 1:24 pm Post subject: |
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It says "Signetics 8008 CPU" - which is not only false, but misleading.
| doccybrown wrote: | | But I would not go the way to say Signetics never made a 8008-clone only because I never saw one before. |
Believe me, if they made one, I'd know about it... And if they put an 8008 and some other die in the same package, it wouldn't be called an 8008.
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Thu Sep 28, 2006 1:33 pm Post subject: |
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| doccybrown wrote: | | Please let me know if you would sell your Motorola MC4004 |
Here you go...
That'll be $1000 in gold doubloons. 
(MC4004 = 16 bit TTL RAM)
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Thu Sep 28, 2006 1:35 pm Post subject: |
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Mixeur you are right on the linked auction it was
not said it is an Intel 8008-clone.
Only Signetics 8008 CPU.
What if it really is a CPU?
Maybe not a clone but in the whole
compatible CPU to the Intel 8008 with same opcodes?
Or just a CPU developed by Singetics nobody knows from
and which has nothing to do with the Intel C8008 at all
/Doccy
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Last edited by doccybrown on Thu Sep 28, 2006 1:44 pm; edited 1 time in total |
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Thu Sep 28, 2006 1:43 pm Post subject: |
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| chip68 wrote: | | doccybrown wrote: | | Please let me know if you would sell your Motorola MC4004 |
Here you go...
That'll be $1000 in gold doubloons.
(MC4004 = 16 bit TTL RAM)
- CMW |
I know, I was just kidding 
/doccy
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Thu Sep 28, 2006 2:05 pm Post subject: |
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| doccybrown wrote: | | What if it really is a CPU? |
I'd bet you my right arm it isn't. I have every Signetics data book known to man, plus the IC Master and D.A.T.A. Book series from around that time frame. There are lots of other chips with 8008 part numbers, and none of them are CPUs. In fact statistically speaking, an IC in a ceramic package, picked at random, is about 100 times more likely not to be a CPU than to be one.
That Signetics chip is almost certainly a PROM, or a some other chip commonly used in instrumentation - a counter, A/D converter, multiplexer, etc. Might even be analog, for that matter.
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Thu Sep 28, 2006 8:04 pm Post subject: |
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LOL
There's also his "ULTRA ULTRA RARE GOLD AND BLACK MOTOROLA MC8308P CHIP. YOU WILL NEVER FIND THIS CHIP AGAIN" (item # 260035936544), which is just a 74116 dual 4-bit latch...
I'm surprised he didn't say, "MC8308 - It's 300 better than an Intel 8008!" 
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Fri Sep 29, 2006 9:56 am Post subject: |
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Ok Synthia (collectachip) may not be the biggest chip-expert ever known
but sometimes she is selling very nice chips! For example I`ve got
really rare chips from her like IDT C6-sample, Chips Super386-25
and many others...
/Doccy
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Fri Sep 29, 2006 10:36 am Post subject: |
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Okay, fair enough. My only point is, in the end, the seller is responsible for what's in the listing, and it ought to be at least somewhat accurate. I think Synthia either needs to do a little more research, or tone down the salesmanship a bit. (Not to pick on her... There are lots of sellers like that, unfortunately.)
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Tue Oct 03, 2006 4:10 pm Post subject: |
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btw, this chip has an 1818 HP part number and as far as I know this was only used for ROM/PROM chips. CPUs had 1820 and higher, ttl logics 1816...
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chip68
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