“sp/architect nonstop tandem” refers to SP/ARCHITECT-BANK, an electronic banking software that ran on the highly available, fault-tolerant Tandem NonStop servers (now part of the Hewlett Packard Enterprise, or HPE, NonStop product line). 

SP/ARCHITECT-BANK Software

• Function: Developed as an electronic banking software package, it enabled functions like desktop access to company accounts, inter-account transfers, and bookkeeping, which was considered cutting-edge in the early 1990s.
• Developer: The software was developed by a Runcorn-based software house called The Software Partnership (later acquired by Deluxe Data in 1994).
• Users: Various banks, including TSB, Bank of Scotland, Rabobank, and Girofon (Denmark), used the software. 

Tandem NonStop Servers

The NonStop servers, originally from Tandem Computers Inc., are known for their extreme reliability and scalability, making them suitable for mission-critical applications in finance, telecommunications, and retail. 

Key architectural features include:

• Fault Tolerance: The systems use redundant components (processors, storage, controllers, power supplies) with a “shared-nothing” architecture to ensure continuous operation even if a component fails.
• Operating System: They use a proprietary, message-based operating system, the NonStop Kernel (NSK, originally Guardian), which manages fault detection and failover automatically, without human intervention.
• Current Status: Tandem was acquired by Compaq in 1997, and Compaq was subsequently acquired by HP in 2002. The NonStop product line is now offered by Hewlett Packard Enterprise (HPE). More information is available on the HPE website. 

The Software Partnership (later acquired by Deluxe Data in 1994)