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In page ZX80:

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Other than the built-in cassette and video ports, the only provided means of expansion is a slot opening at the rear of the case, which exposes an expansion bus edge connector on the motherboard. The same slot bus was continued on the ZX81, and later the ZX Spectrum, which encouraged a small cottage industry of expansion devices, including memory packs, printers and even floppy drives. The original Sinclair ZX80 RAM Pack holds either 1, 2 or 3 KB of static RAM[1] and a later model holds 16 KB of dynamic RAM (DRAM).[citation needed] With software, the computer can use up to 48 KB of memory.[2]