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How to test memory?

8008guy

Veteran Member
Joined
Jun 25, 2014
Messages
584
Location
Salt Lake City, Utah
Looking at the site makes me want in. In the past I've built breadboard testers for single chips. Having one for many chips is a cool idea.
 

Stone

10k Member
Joined
Nov 3, 2009
Messages
12,814
Location
South Jersey, USA
I normally test them several at a time until I hit a group with an error. I then test the members of that group individually to determine the bad chip or chips.
 

euro22

Member
Joined
Jan 15, 2020
Messages
23
Location
Munich
Yes, I'm doing the same.
I also have some "exotic" chips in my collection, but I don't have a computer to test them with. Maybe I should try a separate tester.
Take a look at what other testers are available, but the link above looks pretty good.
 

Dwight Elvey

Veteran Member
Joined
Jun 21, 2003
Messages
4,736
Location
Santa Cruz
Using some of the newer controller chips, one can improve the testing to include timing test to find if you have RAM rated at 250 ns, does it really work at 250 ns. That is difficult with the older Arduino stuff.
Dwight
 

gslick

Veteran Member
Joined
Dec 30, 2010
Messages
2,112
Location
Seattle, WA
Hi,

has anyone recommendations how to test old memory ICs? I own a TL886 but it can only test a few SRAMs (e.g. 62256).
I want to test some RAMs found in a Video Genie (SRAM 2102) and PET (DRAM 4116).

I found this website:
https://8bit-museum.de/sonstiges/hardware-projekte/hardware-projekte-speichertester/
Do you think it is worth to build?

Euro

Here is another option, although it only tests 4116 DRAM chips:

http://jmprecision.co.uk/shopping/pgm-more_information.php?id=143

(The seller there has a Youtube channel with some of his vintage computer repairs:
https://www.youtube.com/channel/UCGkakWu37P6CuzIZbTlCmvg )
 

Shadow Lord

Veteran Member
Joined
Jun 16, 2010
Messages
3,155
Location
California
Hi,

has anyone recommendations how to test old memory ICs? I own a TL886 but it can only test a few SRAMs (e.g. 62256).
I want to test some RAMs found in a Video Genie (SRAM 2102) and PET (DRAM 4116).

I found this website:
https://8bit-museum.de/sonstiges/hardware-projekte/hardware-projekte-speichertester/
Do you think it is worth to build?

Euro

That is an interesting tester. Not sure if it would be any help with my need to test cache memory but it would be nice to have around. Are they selling any preassembeled units? Or kits?
 

Stone

10k Member
Joined
Nov 3, 2009
Messages
12,814
Location
South Jersey, USA
My memory test involves figuring out where I put my keys... :)
You should get organized a little bit more.

My keys are always dropped into their permanent resting spot the moment I enter. The spot hasn't changed for 15 years. In that time I've never had to look for them even once. :) :)
 

Shadow Lord

Veteran Member
Joined
Jun 16, 2010
Messages
3,155
Location
California
You should get organized a little bit more.

My keys are always dropped into their permanent resting spot the moment I enter. The spot hasn't changed for 15 years. In that time I've never had to look for them even once. :) :)

I always drop my keys on their permanent stop as well but the darn spot keeps moving! LOL!
 

euro22

Member
Joined
Jan 15, 2020
Messages
23
Location
Munich
That is an interesting tester. Not sure if it would be any help with my need to test cache memory but it would be nice to have around. Are they selling any preassembeled units? Or kits?

I asked the developer. He sells the PCBs, no preassembled units or kits. Except the ATmega2560 the tester is quite easy to assemble.

There is a manual and a list of supported SRAMs, DRAMs and ROMs/(E)PROMs on his site.
 

Shadow Lord

Veteran Member
Joined
Jun 16, 2010
Messages
3,155
Location
California
I asked the developer. He sells the PCBs, no preassembled units or kits. Except the ATmega2560 the tester is quite easy to assemble.

There is a manual and a list of supported SRAMs, DRAMs and ROMs/(E)PROMs on his site.

Thanks for checking. Do you have to contact him directly to order? I did not see an order page or anything like that. The ATmega2560 is going to be an issue for me. I have dabbled in some surface mount soldering but nothing with as many pins as that chip.
 

Muttley Black

Experienced Member
Joined
Aug 4, 2019
Messages
53
Location
Greece
I am in progress for 4116 Dram tester. Still in testing. To be more specific, i am waiting the first boards to come and do my tests.
It is an Arduino 4116 Dram tester. Have in mind that the board you looking it is not in final design. This is the very early design to do my test’s. After that I do some modifications.

When all seems to work properly I will release the Kicad schematic and the Gerber files for those want to build it.




It is based on my first attempt:

 

Muttley Black

Experienced Member
Joined
Aug 4, 2019
Messages
53
Location
Greece
This is the final design for my Arduino 4116 Dynamic Ram tester. At least for this version. I can’t wait for my first prototype boards to came and start the testing. After that and if all go smoothly i start the printing for this version. 7~12 dc volt barrel jack fitted in this version to power up the board from external power supply and not only through the Arduino usb.

95365505-1293444104187988-4828812677157412412-n.jpg
 

euro22

Member
Joined
Jan 15, 2020
Messages
23
Location
Munich
I got one of his new boards now. It is great, really great!

2020-06_rev12.jpg

He made an YouTube video of it:
https://youtu.be/OWo2DZXuhMY

Forgot all existing projects. I have tried them all. This tester can test really everything!

1.JPG
2.JPG
and it has some more great features.

I am really impressed.
 
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