At that price serial ram is kind of convincing... Still it's a shame that I have all these srams...
A feasible niche app might be storing waveform samples in a fast 64kB buffer (UM61512AK's) using 16-pins:
Two cheap counters for 16-bit addressing as 16 fast wrap around buffers of 4KB each.
2 pins are count/reset on a 12-bit CD4040B ripple counter,
3 pins are count/up-down/reset on a 4-bit 74C193 to select each 4kB segment,
3 pins to control the sram as mentioned
8 pins read/write data
Total = 16 pins
(8 can be latched outputs when tri-state sram is not being accessed) 74LS244 ?