Brand New Sinclair / Timex 16K Memory Packs - These are brand new / old stock , never used Timex branded , sinclair ram memory packs for use with the Sinclair ZX80 or ZX81 computers . Expand your 1K memory to 16k ! Brand new and ready to go with your working computer , or to keep as an investment for the future ! We have limited stocks so grab one while you can !