This is where the BIN Hackers and definition junkies discuss the inner workings of the EEC code and hardware. General tuning questions do not go here. Only technical/hardware-specific/code questions and discussions belong here.

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Peter6000
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Can I clone/copy a EEC-IV eeProm 87C66

Post by Peter6000 » Sat Aug 12, 2023 8:18 am

I fixed my Marine EEC-IV by swapping the eeProm 87C66 to automotive junkyard ECU, Is there any way to make a copy or re flash the one I pulled out of the automotive unit? And if so what equipment do I need.
I have a PicKit and a old DataIO but cant find the 87C66.
I searched the forum for a few hours and I'm sure the info is here somewhere I'm just to blind to find it.
Thanks Peter

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cgrey8
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Re: Can I clone/copy a EEC-IV eeProm 87C66

Post by cgrey8 » Sat Aug 12, 2023 8:31 am

It is technically possible to get a read of the original ROM you removed. But it'd probably be far easier, depending on your intentions, to look for a *.bin file of the original tune by searching for it via its catch code.
...Always Somethin'

89 Ranger Supercab, 331 w/GT40p heads, ported Explorer lower, Crane Powermax 2020 cam, FMS Explorer (GT40p) headers, aftermarket T5 'Z-Spec', GUFB, Moates QuarterHorse tuned using BE&EA

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jsa
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Re: Can I clone/copy a EEC-IV eeProm 87C66

Post by jsa » Sat Aug 12, 2023 2:47 pm

It is likely too old to be _EE_prom. If it has the quartz window it is UV erasable. If not, it is likely to be one time programmable.

There is relevant info in these docs;
https://github.com/OpenEEC-Project/Usef ... erence.pdf

https://github.com/OpenEEC-Project/Usef ... Manual.pdf

Please report back if you have any success.
Cheers

John

95 Escort RS Cosworth - CARD QUIK COSY ANTI / GHAJ0
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wwhite
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Re: Can I clone/copy a EEC-IV eeProm 87C66

Post by wwhite » Mon Aug 14, 2023 9:48 pm

Peter6000 wrote: Sat Aug 12, 2023 8:18 am I searched the forum for a few hours and I'm sure the info is here somewhere I'm just to blind to find it.
|Tuning Marine Ford 351W GT40
https://eectuning.org/forums/viewtopic. ... 55#p126834

Peter6000
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Re: Can I clone/copy a EEC-IV eeProm 87C66

Post by Peter6000 » Wed Aug 16, 2023 6:41 pm

Thanks to you all for the quick response, I found the .bin file for the ECU. I'm still looking for a programmer that could actually program the 87c66. I found a ton of information with your help.
As an alternative I might dig in to the J3 adapter.
I will post updates if I get it to work.
Peter

sailorbob
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Re: Can I clone/copy a EEC-IV eeProm 87C66

Post by sailorbob » Thu Aug 17, 2023 5:07 am

I am only aware of two people who have reprogrammed an eec-iv EPROM and AFAIK neither have been active in the eec tuning field for many years. The issue is not so much the programming hardware but the software to deal with the multiplexed address and databus these EPROMs use.

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