The PET was was Commodore’s first full-featured computer and included a monochrome screen & keyboard. It is considered to be one of the first trinity of personal computers. It even had a version of BASIC purchased from Bill Gates’ tiny Micro-Soft company.
The computer was built around a MOS Technology 6502 @ 1 MHz chip. (2nd from top)
This was an 8-bit microprocessor competing with the Zilog Z80 & the Intel 8080.