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Sinclair ZX81

The ZX81 is the evolution of ZX80. This computer have 8K ROM and 1K RAM. It was launched in March 1981 and it is the responsable for the home computer boom.

Processor:

-Zilog Z80A running at 3.5Mhz
RAM:

-1K expandable to 64K with RAMPacks
Storage:

-Cassete tapes at 300 baud.
Firmware:

-8K ZX BASIC
Screen:

-Text 32x22 2 colors
-Graphics 64x44 2 colors
Other:

-Expansion connector
-TV Modulator