The UN331C controls the system and executes stored programs that perform call processing activity and maintenance. The UN331C is a RISC that is designed around a MIPS R3000A CPU that operates at 33 MHz. It employs 32-bit address and data buses to obtain and execute instructions at a rate approaching one instruction per clock cycle. The 256-Kb instruction cache with burst-mode refill and 256-Kb data cache are key to the performance of the processor. A read and write buffer chip tailors the UN331C to the call processing environment.
- 512 Kbytes of ROM for the monitor
- Counters and timers
- Control, status and error registers
- Logic for bus arbitration and the Bus Time-Out feature
These items have been refurbished. Refurbished items have been cleaned, tested, and confirmed to be fully functional. Grade A - Refurbished items show wear from consistent use and can have some scratches and may have some yellowing or discoloration.
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