16K or 32K RAM Plans T. W. Cook Platform(s): ZX81 TS 1000 Date: 1982 Price: $5 Plans to expand 1K model to 16K or ZX81 with 16K to 32K for under $30. Fits inside ZX81. Tags RAM, T. W. Cook, TS 1000, ZX81 People No people associated with this content.