NORD-20: Difference between revisions
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The NORD-20 was a production version of the NORD-2B |
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The '''NORD-20''' | {{Infobox Machine | ||
| name = NORD-20 | |||
| manufacturer = [[Norsk Data]] | |||
| word size = 16 bit | |||
| year introduced = 1971 | |||
}} | |||
The '''NORD-20''' is functionally identical to the [[NORD-2B]]. ND considered the NORD-20 a production version of the NORD-2B. The difference is that the NORD-20 needed only 6 boards instead of 10 for the CPU[1]. | |||
(However, unlike the NORD-20 the NORD-2B could be delivered with an I/O system compatible with the [[NORD-1]], or with the same I/O system used by the NORD-20.) | |||
The price for a 4K word system, with teletype and punched tape reader, was only NOK 100,000 in 1971. | |||
* Word length: 16 bits. | |||
* Two sets of registers. An interrupt will switch the CPU to the second set. Interrupt latency is therefore never longer than the time of the slowest instruction. | |||
* Instructions not implemented in hardware are implemented as interrupts. This is used to e.g. handle [[NORD-1]] instructions not implemented in hardware in the NORD-2B/NORD-20, by trapping them and implementing them in software. | |||
* Two program levels: System and user level authorization of instructions. | |||
==See Also== | ==See Also== | ||
[[NORD- | * ND-NYTT December 1971, page 12 [https://drive.google.com/file/d/0B2Sc5Qa5d_tLT0RUcFJRX1pFbm8/view] | ||
* Oslo Museum, photo [http://www.oslobilder.no/OMU/OB.%C3%9871/3415] | |||
* [[NORD-2B]] | |||
[[Category:Norsk Data Hardware]][[Category:Norwegian Computer History]] | [[Category:Norsk Data Hardware]][[Category:Norwegian Computer History]] | ||
Latest revision as of 10:06, 30 August 2016
| NORD-20 | |
| Manufacturer: | Norsk Data |
|---|---|
| Year Introduced: | 1971 |
| Word Size: | 16 bit |
The NORD-20 is functionally identical to the NORD-2B. ND considered the NORD-20 a production version of the NORD-2B. The difference is that the NORD-20 needed only 6 boards instead of 10 for the CPU[1].
(However, unlike the NORD-20 the NORD-2B could be delivered with an I/O system compatible with the NORD-1, or with the same I/O system used by the NORD-20.)
The price for a 4K word system, with teletype and punched tape reader, was only NOK 100,000 in 1971.
- Word length: 16 bits.
- Two sets of registers. An interrupt will switch the CPU to the second set. Interrupt latency is therefore never longer than the time of the slowest instruction.
- Instructions not implemented in hardware are implemented as interrupts. This is used to e.g. handle NORD-1 instructions not implemented in hardware in the NORD-2B/NORD-20, by trapping them and implementing them in software.
- Two program levels: System and user level authorization of instructions.
