IDT SIM
From LinuxMIPS
IDT System Integration Manager (IDT/sim) is a software/firmware product that facilitates convenient download of programs to IDT 79RCxxx evaluation boards and execution as well as debug of such program.
IDT/sim is equipped with a built-in assembler, disassembler, entry points for user-defined commands, interrupt handlers, a ROM-resident "C" library and I/O interface for a variety of devices that include serial, ethernet, PCI, I2C, SPI, and much more.