Classic Sad Mac: RAM Error?

[LaPorta]

I'm just going to score them from another board I have...but where does one get new ones of these from? I'm having a tough time finding replacements.

 

[LaPorta]

Well, replaced those two chips with (assumed good) ones, and I get further errors:

00000005
0007000F

Failed external address line this says? Which and what lines am I looking for now? Looks like a bunch with the second line.

 

[ymk]

00 07 00 0F in binary is:

00000000 00000111 00000000 00001111

A0, A1, A2, A3, A16, A17, A18

You might be able to get more NOS chips on ebay. I expect they're long out of production.

You could try swapping in another pair.

 

[LaPorta]

00 07 00 0F in binary is:

00000000 00000111 00000000 00001111

A0, A1, A2, A3, A16, A17, A18

You might be able to get more NOS chips on ebay. I expect they're long out of production.

You could try swapping in another pair.

Thank you. I truly appreciate the help as I have no formal training in any of this. I actually just ordered this RAM, hoping to harvest the chips from the stick:

256KB NEC 30-Pin Sram Simm Parity RAM Memory 256Kx9 100ns 424256-10 | eBay

Please use the technical table below to carefully check whether the memory modules are suitable for the planned application. Please also note the specified module height - this can be important in devices with limited space. Please, check carefully whether the memory modules are suitable for the...

www.ebay.com