Author Topic: GI ER3400 earom  (Read 318 times)

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Offline Daxxin

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GI ER3400 earom
« on: May 09, 2019, 09:54:31 am »
Its possible to clone the content with a programmer?
Cant find much info with google
« Last Edit: May 09, 2019, 11:36:56 am by Daxxin »
 

Offline picburner

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Re: GI ER3400 earom
« Reply #1 on: May 09, 2019, 07:26:02 pm »
Some time ago I built this adapter to read and save the contents of the er3400 of my Solartron 7081.
You must select 2716 (or another 2K eprom in the eprom-programmer) and read 1KByte only.
Of course only the first data nibble is valid (D0-D3).
I have never ventured into writing this old earom with an eprom-programmer.
« Last Edit: May 10, 2019, 05:33:32 am by picburner »
 

Offline JFJ

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Re: GI ER3400 earom
« Reply #2 on: May 09, 2019, 10:06:38 pm »
Its possible to clone the content with a programmer?

I've never encountered an off the shelf programmer that could generate the -30V that has to be applied pin 1 (Vgg) of an ER3400 during write mode. So, using a standard programmer to write a copy to another ER3400 may not be straightforward.

Some time ago I built this adapter to read and save the contents of the er3400 of my Solartron 7081.

I also used an EPROM programmer to backup the contents of the ER3400 from my Solartron 7081. Instead of building an adapter, I just plugged the ER3400 into a breadboard, and used jumper leads to connect it to a 24-way turned pin DIL socket (configured as a 2716 EPROM), which was then inserted into my programmer's ZIF socket. The -12V Vdd voltage was provided by an external bench power supply. I didn't bother with a -30V supply, because the ER3400 can be operated with Vgg tied to Vss (+5V) in read mode.

Incidentally, the voltages supplied to pins 1 and 2 of the ER3400 socket in your circuit diagram appear to have been transposed:

 

Offline picburner

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Re: GI ER3400 earom
« Reply #3 on: May 10, 2019, 05:39:37 am »
Thanks for the warning: I corrected the error in the schematic.
In fact even my 'adapter' is very basic as it is a copy job I would have done only once.
 

Offline Daxxin

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Re: GI ER3400 earom
« Reply #4 on: May 10, 2019, 06:08:14 am »
Thanks for the answer but another question how do you planned to restore your backup in case need?
 

Offline Chris56000

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Re: GI ER3400 earom
« Reply #5 on: May 10, 2019, 07:19:47 am »
Hi!

I can't seem to  locate it just at the moment but there is an easy–to–build ER1400 programming adaptor circuit built out of a handful of cheap components – you might be able to use this!

Chris Williams
It's an enigma that's what it is!! This thing's not fixed because it doesn't want to be fixed!!
 

Offline picburner

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Re: GI ER3400 earom
« Reply #6 on: May 10, 2019, 02:47:01 pm »
how do you planned to restore your backup in case need?

Good question!
Indeed, if reading the device is not so complicated, to program it it is necessary to build a dedicated programmer that executes the erasure and programming sequence described in the datasheet.
As already mentioned by JFJ, finding a commercial programmer able to program this device is difficult due to the -12V and -30V voltages required.
I hope I don't have the need to program this device soon...
 

Offline Daxxin

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Re: GI ER3400 earom
« Reply #7 on: May 10, 2019, 04:32:53 pm »
Yes maybe external power supply , then i seen there 2 different version of ER3400 and ER3400H look like the second one need -35v or -37v
to write the content .
 


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