These are clone chips from umc. I guess they were notorious for making their own nes compatible cpu/ppu and selling them to make hardware clone systems

http://pages.ebay.com/link/?nav=item...733454&alt=web

Your not upgrading from a PAL system so you shouldn't need to install the crystals.
I'd try changing ram first though. Console5 has a wiki and should have part numbers to find the ram on mouser or digikey. I think those both ship to Canada