There were no sticks then, just RAM chips on the mainboard or on an expansion card fitted in the back of the computer. ZX80 was built to cost 100GBP, a big chun

There were no sticks then, just RAM chips on the mainboard or on an expansion card fitted in the back of the computer. ZX80 was built to cost 100GBP, a big chunk of that was the memory since it used expensive SRAM chips.