Source: ndwiki article "NORD-10/S"¶

Live page: https://www.ndwiki.org/wiki/NORD-10/S
Copy used here: Wayback Machine snapshot, fetched 2026-08-27 by Ronny's request. The live ndwiki is behind an Anubis proof-of-work gate.

Status: SECONDARY, short, but every claim is footnoted to one source - which the page identifies only as reference [1], repeated throughout.

Introduced 1975, a follow-up to the NORD-10 adding cache, paging and other improvements.

Memory from 1K to 256K 16-bit words, read-only or read/write.
Maximum virtual address space 128 Kbytes; maximum physical address space 512 Kbytes. (Note the units - Kbytes, not Kwords. 512 Kbytes is 256 Kwords, which matches the NORD-10 page's 256K words.)
16 priority interrupt levels, each with 8 registers - unchanged from the NORD-10.
Bootstrap loaders for both mass storage and character-oriented devices, with three standard load formats: octal, binary and mass storage.

We hold the primary manual for this machine - Reference-Manuals/10/ND-06.008.01 NORD-10-S Reference Manual.md - so this page should be treated as an index to it, not as a source in its own right.

Verbatim extract¶

The NORD-10/S was a 16-bit medium scale general purpose computer system[1] made by Norsk Data, introduced in 1975. It was a follow up to NORD-10 and introduced cache, paging, and other miscellaneous improvements.

Contents¶

1 Memory

2 Interrupt System

3 Bootstrap loaders

4 Custom Instructions

5 Performance

6 References and sources

Memory¶

Memory size may vary from 1K to 256K 16-bit words. Both read-only and read/write memories may be used.

Maximum virtual memory address space is 128 Kbytes.

Maximum physical memory address space is 512 Kbytes.[1]

Interrupt System¶

16 priority interrupt levels each with 8 registers.[1]

Bootstrap loaders¶

The NORD-10/S has bootstrap loaders for both mass storage and character oriented devices[1]. Three different load formats are standard:

octal format load

binary format load

mass storage load

Custom Instructions¶

The NORD-10/S provides up to 1024 customer-specified instructions. These instructions are micro-programmed in a programmable read-only memory, which is added onto the standard read-only memory.[1]

Performance¶

Whetstone results [2]

ROW| 0.153 | 0.0019 | Fortran | 1974 |

References and sources¶

^ 1.0 1.1 1.2 1.3 1.4 30.001.01A NORD-10/NORD-50, Operator's Guide

^ Whetstone Benchmark History and Results