I know this has been done many times in the past, but just a short note of what i have done. Had some W24M512AK 64 kbyte sram chips lying around. Chipselect pin 22 is just connected to A15 of the 6502.
So if address line 15 is low, address #0000 to 7FFF can be addressed.
Connected CS2 and A15 from de ramchip to Vcc and OE to Vss.
The WE pin 29 is connected to pin10 from the 2114 chips (yellow cable). After powering up the Atom shows ATOM >

I can save and run a program.
Have to do some tests though if all works wel.
Jan