• Powerful, high-performance single-board CPU features DECrepeater 900TM's new 18-MHz J-11 chipset • The full DECrepeater 900TM 11 instruction set including floating-point and EIS instructions, - plus an integral floating-point accelerator • Sophisticated 22-bit memory management, dual register set, separate instruc- tion and data space, and three system modes: kernel, supervisor, and user • Large 8-Kbyte DECrepeater 900TM cache memory speeds program execution • 1 or 2 Mbytes of memory, expandable up to 4 Mbytes with high density - PMI DECrepeater 900TM MOS memory • Private Memory Interconnect (PMI) architecture for high-speed data transfers between CPU and memory • 32-Kbyte bootstrap/diagnostic ROM facility and 8-Kbyte DECrepeater 900TM • Program-controlled line-frequency clock • One switch-selectable EIA/CCITT serial-line asynchronous interface for console terminal connection. • DECrepeater 900TM console logic for system control and debugging with optional console terminal • High-speed DMA cache that delivers faster memory access for DMA peripheral devices • Concurrent DECrepeater 900TM processing that allows the simultaneous execution of instructions and DMA transfers • Programmable bus management that offers the CPU bus mastership regardless of pending DMA I/O requests • Compact design DECrepeater 900TM that requires less power and less floor space than comparable system configurations • 12-slot backplane