NORD-100

The NORD-100 was a 16-bit minicomputer series made by Norsk Data, introduced in 1979. It shipped with the SINTRAN operating system, and the architecture was based on, and backwards compatible with, the NORD-10 line.

Originally designated the NORD-100, the series was later renamed ND-100 in a decision to internationalize the brand names.

Models include:
*NORD-100/CE, Commercial Extended, with decimal arithmetic instructions (The decimal instruction set was later renamed CX)
*ND-110/CX, improved ND-100
*ND-120/CX ("Delilah"), improved ND-110
*ND-100 Satellite, small ND-100 system with support for either 5 or 9 terminals, in a small case.

The ND-100 was machine-instruction compatible with the Nord-10 line, except for some "extended instructions" mostly used by the operating system. It was fairly unusual in its time in that most machine-oriented numbers were in octal; this was due to the extensive use of 3-bit register addresses in instructions, which made them easier to "decode in your head" if you were using octal.

The ND-100 series had a microcoded central processing unit, with downloadable microcode, and was considered a CISC processor.