Released in 1981
CPU Z80A (3.5 MHz) ROM 8 KBytes BASIC interpreter RAM 1 KByte internal (externally expandable to 16 KBytes) Data medium Music Cassette (250 baud)		Graphic resolution 64 x 48 pixels Text resolution 24 lines x 32 columns Colors 2 colors (Black and White) Sound none
Additional Sinclair ZX 81 information from Thierry Schembri's computer museum

My other computers

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