The release in 1977 of the first PET model (the 2001) by Commodore Business Machines propelled the company to the forefront of the then new personal computer market.
The first PET was a fully integrated computer with the monitor, motherboard, keyboard and cassette drive all in one package. The PET’s main competitors at the time (TRS-80 and Apple ][) offered all these individually thus making the PET an attractive package for the first time computer buyer.
The first model had a tiny 4k of RAM and a very average (some would say very bad) chiclet keyboard. Commodore were caught unaware of just how popular the machine would be and struggled to fill pre-orders.