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Sinclair ZX80

The ZX80 is the first model of the ZX computers range. Launched in February 1980. It have 4K ROM and 1K RAM and only could process integer numbers. This was the first computer with a price lower than 100. Sinclair Research sold a kit (ROm with 8K and a template for the keyboard) to upgrade the ZX80 to a ZX81 keeping the box. It was selled in form of a kit so the user built the own computer (it was cheaper too) ou already assembled.

Processor:

-Zilog Z80A running at 3.5Mhz
RAM:

-1K expandable to 64K with RAMPacks
Storage:

-Cassete tapes at 300 baud.
Firmware:

-4K ZX integer basic
Screen:

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

-Expansion Connector
-TV Modulator