Tandem NonStop Cyclone/R

The Tandem NonStop Cyclone/R introduced commercial MIPS RISC processors to the NonStop family while preserving compatibility with the proprietary TNS software base. Existing object code could be translated during installation or interpreted, allowing customers to migrate without rewriting applications.

Processor modules used redundant R3000 devices and Tandem checking logic to meet the company’s data-integrity requirements. Later native-mode NonStop Kernel software allowed new applications to exploit the RISC architecture directly.

Notable Features

• TNS object programs were translated into partially optimised MIPS instruction sequences by the Accelerator tool.
• Redundant R3000 processors and comparison logic provided the fail-fast behaviour required by NonStop systems.
• A later operating-system release added native MIPS execution while retaining compatibility facilities.

Historical Significance

• Cyclone/R was the bridge between Tandem’s proprietary processors and its long-running MIPS-based NonStop product line.
• Its binary-translation strategy preserved customer software and became a lasting part of later architecture migrations.

Collector’s Notes

• Documentation may use both Cyclone/R and CLX/R terminology for related RISC transition systems.
• Processor generation and installed NonStop Kernel release determine whether software runs translated, interpreted or natively.

Specifications

Technical Information
Name	Tandem NonStop Cyclone/R
Manufacturer	Tandem Computers
Launched	Tuesday, January 1, 1991
Discontinued	Mid-1990s
Country	United States
CPU	MIPS R3000 RISC processor modules
Units Sold
Power	Redundant, serviceable system power supplies; requirements depended on cabinet configuration
Fault Tolerance	Redundant checked RISC processors, process pairs, dual paths and mirrored storage
Architecture	MIPS R3000 RISC implementation with TNS object-code translation
Networking	Expand networking, Ethernet and enterprise protocols
Operating System	NonStop Kernel; Guardian-compatible translated environment and later native MIPS mode
Expansion / I/O	Redundant NonStop system interconnect inherited from CLX/Cyclone components
Keyboard	External operator console terminal keyboard
Storage	Mirrored SCSI and Tandem disk subsystems with redundant paths
Sound	No general-purpose sound hardware
Graphics	Terminal-oriented text output; no integrated graphics subsystem
Display	External operator console terminal; no integrated display
ROM	Boot, diagnostic and processor microcode storage; capacity varied by generation and configuration
RAM	Protected private memory per processor; capacity varied by configuration
CPU Speed	MIPS R3000 clock varied by processor revision