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Coleco ADAM Ram Expansion and Tape Drive Repair

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On 8/15/2019 at 7:21 PM, soviet said:

Mike the 15NL chips will work solder sockets first so you can replace them easy in the future the only difference between the 15NL and the 20NL is that they are faster so no problem.

I have some 15NL's on the way and there is always a BUT in there...

If the old Chips are 20NL's and you piggyback the 15NL's?
You see where I am going with this.

I guess the only thing is to try and see.
My real concern is with the fraud on ebay is if I get good, working chips.
Seriously, I have lots of tools around the house but I don't know how to test memory chips.

My TNM5000 can read and write eproms, my capacitor tester checks components...memory is an eh..
 

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i know is a lot of work but the best way is remove all chips install sockets and replace all of them.

If you don't socket  them is hard to test and be sure what chip is the one failing.

You can use the piggyback method in my case never worked to find the bad ram.

 

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Someone out there knows a heck of a lot better than I do being I am like an intermediate newbie.

Underneath the later ADAM R80 Eproms is a piece of film with a pin on each end.
I suspect they are a modification to use newer types of chips but can someone tell me what they really are and what they are used for.

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12 hours ago, Mike Harris said:

Someone out there knows a heck of a lot better than I do being I am like an intermediate newbie.

Underneath the later ADAM R80 Eproms is a piece of film with a pin on each end.
I suspect they are a modification to use newer types of chips but can someone tell me what they really are and what they are used for.

Its a resistor pack

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