systems:2nd_edition
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systems:2nd_edition [2023/05/20 17:07] – fix links segaloco | systems:2nd_edition [2023/05/23 08:17] (current) – hardware specifics segaloco | ||
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**Documentation: | **Documentation: | ||
- | The second edition | + | The Second Edition |
+ | |||
+ | The Second Edition, like the first, was only designed to run on the unprotected PDP-11/20 and requires the Extended Arithmetic Element to simulate some operations which would later be supported natively on the PDP-11/45 and other models. This would be the last PDP-11/20 unprotected version of UNIX, as the following Third Edition represents an intermediary PDP-11/45 assembly version of the system and the kernel is rewritten in C before the Fourth Edition. | ||
The code in the Unix Archive is only the source to some of the commands, some of the library functions, and the C compiler. The files in c/ come from the [[https:// | The code in the Unix Archive is only the source to some of the commands, some of the library functions, and the C compiler. The files in c/ come from the [[https:// |
systems/2nd_edition.txt · Last modified: 2023/05/23 08:17 by segaloco