Odd clock chip....

[Nick]

Just saw this - any ideas what the chip could be - looks like a Mostek ceramic package, but could be anyone. Not an MK 5314 but package looks like that used on some Mostek chips, e.g. the MK 2927.and 5011P (see attached). Perhaps a bespoke chip? Russian?

The nixies are Rodan GR-116D, which are Japanese.Not that means a lot.

http://worldphaco.com/uploads/THE_1972_DIGEEC_NIXIE_CLOCK_FROM_EUROPEAN_ELECTRIC_COUNTING_AND_THE_MYSTERY_28_PIN_CMOS_LSI_CHIP.pdf

Cheers

Nick

[Nick]

Bit more on this - European Electronic Counting definitely had custom chips made for them by Emihus Microcomponents Limited (also known as "EML"), a UK company based in Weybridge, Surrey with a manufacturing plant in Glenrothes, Scotland. Emihus, was an LSI manufacturer specialising in calculator chips, jointly owned by EMI (Electrical and Musical Industries, 49%) and Hughes Aircraft (51%)...

I've found references to the HEEC2, also known as the EDC 6051 and EDC 6052 (depending on options). - there's an article in ETI, page 62, http://www.americanradiohistory.com/Archive-Electronics-Today/70s/Electronics-Today-1975-08.pdf however, the clock is from 1972, so it may be an earlier chip. I would assume that the initials "EEC" in the part code are not coincidental...

Nick

[Terry S]

I don't understand -- both posted photos clearly say Mostek on them.

[Nick]

Did you read my OP? I said that the chip "looks like" a Mostek in the attached photos... not that it was a Mostek...

Nick

[Terry S]

It was not clear that you were posting pictures of what the chips in question look like. You posted pics, silly me for assuming they were of the chips you were asking about.

[Nick]

Sorry about that - didn't mean to appear rude -  if you read the article there is a picture of the LSI chip - its package is very similar to that used by Mostek in the two example photos, however I suspect that it's a custom design from Emihus.

Nick

[Terry S]

No offense taken, nor intended. 

It does highlight how even in these days of instant global communication, just how poor we humans still are at communicating. :-)

Terry

[Nick]

It just so happens I know someone on another forum that knows the son of one of the key people in EEC, so there may be progress on this...

Nick

[GastonP]

A bespoke could be very expensive... I believe that could be a Russian chip, but by that time is sounds complicated, in spite of that we know that Russian tubes made their way to the European market... really a mystery.

[J Forbes]

it looks more like an intel chip.

[Nick]

Almost certain now it's a custom EML (Emihus) device.

Nick

[Terry S]

I had to google "bespoke", illiterate 'Merkan that I am..... It's an uncommon usage here. 

[John Smout]

> On 27 Feb 2018, at 13:04, Terry S <tschw...@gmail.com> wrote:
>
> I had to google "bespoke", illiterate 'Merkan that I am..... It's an uncommon usage here.

I had to google Merkin,

John S

[Nick]

I suspect that most Merkins are bespoke...

Nick

[Terry S]

Merkin is very different than Merkan.

[Nicholas Stock]

Indeed.

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[Nick]

It's called "a play on words" :)

[Terry S]

Apologies in advance.

There once was a gal from Nantucket

Whose hair was so long she did pluck it

Then along came a Gherkin

That twiddled her Merkin

To which she declared: Awww, ____ it.

:-)