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Encore 91 and 93 Series

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Overview

Encore built two types of m88k-based computers in the early 1990s:

Encore 91 Series

• Also called "Gemini"
• Targeted for real-time applications
• SMP-machine
• 2-4 25MHz 88100 CPUs
• 2 88200 CMMUs per CPU
• 16KB/16KB external I/D L1 cache
• 16MB RAM per CPU card
• 100MB/s bus bandwidth to the system's shared memory (local RAM from other CPUs) via the "Local bus"
• Up to 272MB of shared memory
• UMA-architecture
• CPU board is a 9U VME Board, includes: VME-64, Ethernet, dual-SCSI, RS232
• The CPU are located as HYPERmodules (see MVME188) on the CPU-board
• Up to four RAM expansion cards, 16 or 64 Mb each, can be added.

Encore 93 Series

• also called "Encore 88k MultiMax"
• Targeted for parallel processing, database and fileserving
• System built up with RPCs (RISC Processor Cards):
• Each features 4 25MHz 88100s and 2 88200 per CPU.
• 64MB local memory pre RPC.
• Up to 8 RPCs per system (= maximum of 32 CPUs)
• 100MB/s bus bandwidth via "Nanobus"
• Maximum of 640MB shared memory
• UMA-architecture

Operating Systems

• UMAX V - SMP version of Unix SystemV R3.2 with BSD and Mach extensions. Supports POSIX parallel threads
• Encore 91: MicroMPX (RT guest OS, can take control of up to 3 CPUs)

Pictures:

• Encore 91: desk-high cabinet, mid- and full-size cabinets (both pictures are on Encore's website).

References:

• Encore computer 91 System

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