The Personal Electronic Transactor (PET) was introduced by Commodore in 1977 and was based on an MOS Technology 6502 CPU. It came with 4K of RAM and a built-in BASIC interpreter. This machine became an early favorite in schools since it was easy to program, provided monochrome graphics capability, and was inexpensive, just $795--or half the price of an Apple II. A built-in cassette tape recorder provided mass storage. It was designed by Chuck Peddle. Comes with homemade slip cover.