Today I recieved a motherboard that has some very interesting characteristics. Something I have never seen before leading me to believe it's a late prototype. As you can see form the pictures it has yellow paint instead of the normal white paint marking what chips go where and what component is what.

Another interesting thing I not is it has these weird circle markers in 2 of the corners.

It also has a hand written number on the serial number.

Also I've never seen this kind of branded ram chips in a 512k

When I got this motherboard the rom chips were removed so I just threw in a pair of rom chips

When I tried to boot it it came up an error most likely a ram error;(

Also today I rec a late model 128k motherboard I would call it the second revision motherboard the kind that you would get out of a 128 that has the Macintosh 128k label on the back of it.

Anyway that motherboard has some very interesting set of rom chips in them

Surprisingly the 128k motherboard even with the know low quality doomed to fail Apple branded ram chips booted up just fine! I was happy to see that.

If anyone has any idea what this 512k motherboard could be or if it's just a normal nothing special board or just want to talk about it feel free to leave a post and maybe we can figure this out

Thank you everyone!!!