The iSBC 80/16 Single Board Computer is a complete computer system that is designed around the 8-bit 8080A-l MOS microprocessor, clocked at a rate of 2.048 MHz. The iSBC 80/16 board provides an iSBC 80/1OB board replacement for many applications. The board contains 6 JEDEC-compatible memory chip sockets (for installation of up to 64k bytes of user-provided memory), a serial communications port providing an RS232C interface, two parallel I/O ports providing 48 individual I/O lines, two iSBX Bus connectors providing functional expansion by interfacing to all 8-bit iSBX Multfmodule boards, and a Multibus interface supporting 8-bit data transfers. The board is shipped with 2k bytes of Static RAM installed into one of the JEDEC-compatible memory sockets. The iSBC 80/16 board is compatible with the Multibus interface when the board is operated as the only master on the interface, and requires the use of a special Multibus interface control exchange mechanism if used with another bus master. The board receives one interrupt signal from the Multibus interface and is configurable for operation as a limited bus master in a system environment. Compatibility of the iSBC 80/16 board with the iSBC 80/1OB board includes compatibility with most of the software designed for the iSBC 80/1OB board.