Difference between revisions of "NORD-20"
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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 11:06, 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.
