Hello,

I copied the page where the EA4004 is mentioned from the book @KeepItSimpleStupid mentioned:



Bertus

 

It's mentioned here https://archive.org/stream/bitsavers_icMaster19_198675341/1977_IC_Master_djvu.txt. but I didn't go any further than that.

At least as I can tell from the unformatted text there is not much data there about the chip. It does exist though...

Any other ideas of reference material I can look into?

And thank you very much!

 

Hello,

I copied the page where the EA4004 is mentioned from the book @KeepItSimpleStupid mentioned:

View attachment 152822

Bertus

Oh wait - that formatted page helps a lot- character generator... hmmm

Any idea on where a data sheet might live? That may be a fun project.

And thank you very much!

 

The manufacturer was Electronic Arrays and they resided in California.

 

Just found an old IC - 24 pin ceramic with gold leads and the wide 0.6in form. Have searched the web but could find almost nothing about EA - let alone this chip. I do see that Apple used some EA chips in their computers at one time.

EA 4004
7624

Hoping that one of your old data books goes back to 1976 to describe this one.

I think they were memory chips made by Electronic Arrays. I think they also made memory boards with their own chips on them.

I don't think I have any EA data books but I will look.

 

Oh wait - that formatted page helps a lot- character generator... hmmm

Any idea on where a data sheet might live? That may be a fun project.

And thank you very much!

So much for my guess that they were memory chips.

The old Apple][ schematics might help by showing the pinout. I think I have seen the schematics on-line.

 

`The 4004 is an early Intel microprocessor too. It was used in calculators. It pre-dated the Intel 8008.

FWIW:

I bought an old RS232 terminal surplus, that came with a band printer as well. It was all TTL, no microprocessor at all. I probably have the schematics. In any event, I changed the character generator, dead bug style, so it could display lower case characters. I think it could input lower case characters. So, that was fun.

 

Hello,

There is a patent online where this is mentioned:
One such publication is titled, Static ROM Row Scan Character Generator, EA4004," dated March, I971, published by Electronic Arrays, Inc.

https://patents.google.com/patent/US3868672A/en

I also found this online:
https://www.datasheetarchive.com/specsheets/non_pdf/EA4004

Bertus

 

I have a number of databooks late 1969 going forward. Fairchild, NSC,
Signetics, Siliconix, AD, Mot.....

Even National MOS databook, primarily PMOS, shift registers used as memory
prior to 1101 DRAM.

In school 1972 I wrote a letter to Motorola, identifying myself as a student, and
asked for every ap note ever published. Got two large boxes, ~ 200 ap
notes, 8.5 x 11 format.

I have thought about ebay selling but really prefer contributing to an organization
for the profession. For shared knowledge.

Is here any organized funded effort out here ?

Regards, Dana.

 

Hello,

@danadak , Perhaps the bitsavers would have interest.
They have now only 4 appnotes on their site:
http://www.bitsavers.org/components/motorola/_appNotes/

They already collected quit a bit of other Motorola stuff:
http://www.bitsavers.org/components/motorola/

They also got a lot of other companies mentioned:
http://www.bitsavers.org/components/

Bertus

 

Hi everyone
On this link on Ebay: https://www.ebay.it/p/TMS1000-Integrated-Circuit-Case-Dip28-Make-Kbi/1293721847

Part # TMS 1000 and it is manufactured by KBI ???

Would like to find the data sheet for this chip, can anyone help.

Done lots of searching, no success. Possibly a Kingstate ?? but cannot find it.

Could be a 'copy' of a Texas Instruments ic.

Ebay supplier unable to help with datasheet.

The Texas Instruments same part # were always marked and had a masked program number on.
Thankyou

Charles Harris
.

 

Hello,

It could be a knock-off of the TI chip.
There are many more sellers on ebay that sell the Texas chip:
https://www.ebay.com/sch/i.html?_fr...1313&_nkw=TMS1000+Integrated+Circuit&_sacat=0

In the PDF's you will fund the documentation I got on the chip.

Bertus

 

Hi Bertus
Thanks for great info on the PDFs.

On Ebay list mostly the same seller who has nothing.

Normally they came with a masked program on the chip. The Ebay ones maybe without mask, only useful if they could be programmed

Regards
Charles

 

Some masked ROM microcontrollers of that era could have the internal ROM disabled. You could then attach external memory for debugging. This, of course, makes the port pins unavailable. Some manufacturers had port replacement chips to let you get the port pins back.


The program in a masked ROM cannot be changed. The program is part of the manufacturing process.

 

All my old data books (70's-90's) have been burned...The only one I saved is the diode data book from Motorola. My experience is that many IC's are no longer manufactured (lack of demand). And even if you were to find some old stock, the prices are outrageous. The same thing happened with old auto parts...and will continue to happen. Modern electronics are largely un-repairable and have a useful life of only 7 years (or less). PLA's have largely replaced specific function IC's.
(UL data and law of the squares).

 

All my old data books (70's-90's) have been burned...The only one I saved is the diode data book from Motorola. My experience is that many IC's are no longer manufactured (lack of demand). And even if you were to find some old stock, the prices are outrageous. The same thing happened with old auto parts...and will continue to happen. Modern electronics are largely un-repairable and have a useful life of only 7 years,
(UL data and law of the squares).

My interest would be servicing legacy equipment - but PDfs take up a lot less space.

 

Hello,

Many databooks and more can be downloaded from the bitsavers site:
http://bitsavers.informatik.uni-stuttgart.de/

The datasheets/books and application notes can be found using the components link.

Bertus

 

I've been searching every where for information on an old serial communication IC HD43370. It was most likely manufactured by Hitachi. I would greatly appreciate it if someone were able to provide any help.

Respectfully,
Richard

 

I've been searching every where for information on an old serial communication IC HD43370. It was most likely manufactured by Hitachi. I would greatly appreciate it if someone were able to provide any help.

Respectfully,
Richard

Is this a digital part like a UART or something else?

I will look in my data books collection within the next few days. I forgot to do it last night.

 

Is this a digital part like a UART or something else?

I will look in my data books collection within the next few days. I forgot to do it last night.

It is a serializer/deserializer. It's used in some obsolete equipment I have for remote communications. It's used in both the transmitters and recievers. After staring at enough wave forms to make my head hurt I finally realized it is using alternate mark inversion.