nManufacturers used integrated
circuit technology to build smaller and cheaper computers.
The first of these so-called personal computers (PCs) was sold
by Micro Instrumentation Telemetry Systems. The Altair 8800
appeared in 1975. It used an 8-bit Intel 8080 microprocessor,
had 256 bytes of RAM, received input through switches on
the front panel, and displayed output on rows of light-emitting