PMON
From LinuxMIPS
PMON is a freeware ROM-monitor developed for LSI Logic MIPS evaluation boards. Since its creation, PMON has become a very common ROM-monitor for MIPS development.
For information on PMON, visit Phil Bunce's (PMON's designer) website at http://www.carmel.com/pmon .
Seems, unavailable now, so use: http://web.archive.org/www.carmel.com/pmon/