Pertec Computer Corporation (PCC), formerly Peripheral Equipment Corporation (PEC), was a computer company based in Chatsworth, California which originally designed and manufactured peripherals such as floppy drives, tape drives, instrumentation control and other hardware for computers.

Pertec's most successful products were hard disk drives and tape drives, which were sold as OEM to the top computer manufacturers, including IBM, Siemens and DEC. Pertec manufactured multiple models of seven and nine-track half-inch tape drives with densities 800CPI (NRZI) and 1600CPI (PE) and phase-encoding formatters, which were used by myriad original equipment manufacturers as I/O devices for their product lines.

In the 1970s, Pertec entered the computer industry through several acquisitions of computer producers and started manufacturing and marketing mostly minicomputers for data processing and pre-processing. This split up Pertec into two companies. Pertec Peripherals Corporation (PPC), which remained based in Chatsworth, California, and Pertec Computer Corporation (PCC), which was located at 17112 Armstrong Avenue, in Irvine, California.

Pertec bought MITS, the manufacturers of the MITS Altair computer, for US$6.5 million in 1976. This purchase was motivated mainly by the ownership of the Microsoft BASIC sources and general license that Pertec erroneously assumed to be included in the deal. They also acquired iCOM Microperipherals, makers of computer peripherals, in the same year. They believed that these acquisitions would change them from selling computers mostly for hobbyists, to selling them for small businesses.

Pertec changed their name, after the acquisition of MITS, from Pertec Corporation to Pertec Computer Corporation to "be more reflective of the company's present position and to clearly state our future direction".

As a result of the acquisition, Pertec became involved in the manufacturing of microprocessor-based computers. Their first models were expanded versions of the Altair models, typically coupled to the existing disk-drive range. Despite initially good sales, the Altair's 8080 CPU was becoming increasingly outdated, so Pertec decided to retire the Altair as well as the MITS name itself.

In 1978, the company launched the first of its own designs, the PCC-2000. This was based on two Intel 8085 series microprocessors: one of which was given over to I/O control. Being a high end machine, it was intended to be the core of what would now be described as a workgroup. The machine was intended to support four "dumb" terminals connected via RS-232 serial lines, in addition to its internal console. The basic machine had twin 8-inch floppy drives, each capable of storing 1.2 megabytes and could link to two Pertec twin 14-inch disk drives, giving a total of 22.4 megabytes of storage, which was a very large amount for the time. The system was generally supplied with a multi-user operating system called MTX, which included a BASIC interpreter that was similar to Business Basic. The PCC-2000 was also available with MITS DOS or CP/M. In the UK, several systems were run under BOS. Unfortunately, the PCC-2000 was too expensive for the market and was never a great success.

The MITS 300 was the first product built and released by the Pertec after their acquisition of MITS in 1977. They produced the 300/25 and the 300/55. Both were fully integrated systems that included both hardware and software in one package. The 300/25 used Pertec floppy diskette drives and the 300/55 added Pertec DC-3000 14-inch hard disk. The system consists of the MITS 2nd generation Altair 8800 (or Altair 8800b) computer with hard drive controller and MITS datakeeper storage system. The complete 300/55 business system sold for $15,950 and included the Altair 8800b with 64k of dynamic RAM, a CRT terminal and a desk. The system was designed to handle a variety of business applications including word processing, inventory control and accounting. This system was prone to overheating and had a very short life span.