Английская Википедия:GeckOS

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Шаблон:Short description Шаблон:Use dmy dates Шаблон:Infobox OS Шаблон:Portal GeckOS is a multitasking operating system for MOS 6502, and compatible processors such as the MOS 6510.Шаблон:Sfnp The GeckOS operating system is one of the few successful attempts to implement a Unix-like operating system on the 6502 architecture.

Overview

The system offers some Unix-like functionality including pre-emptive multitasking, multithreading, semaphores, signals, binary relocation, TCP/IP networking via SLIP, and a 6502 standard library.Шаблон:SfnpШаблон:SfnpШаблон:Sfnp

GeckOS includes native support for the Commodore PET (32 KB and 96 KB models), Commodore 64 and the CS/A65 homebrew system.Шаблон:Sfnp Due to the platform independent nature of the kernel code, GeckOS is advertised as an extremely easy OS to port to alternative 6502 platforms.Шаблон:Cn

Binary compatibility with the LUnix operating system can be attained when the lib6502 shared library is used.Шаблон:Cn

Due to the small fixed-location stack of the 6502, and because an external MMU is rarely provided, multitasking is somewhat limited.Шаблон:Sfnp The OS supports a maximum of four tasks when a shared stack space is used.Шаблон:Cn This can be increased to sixteen tasks when stack snapshotting is enabled, although this is done at the expense of some system speed.Шаблон:Cn

A webserver is integrated into the SLIP daemon.Шаблон:Sfnp

Unix on 6502 architecture

While early versions of Unix ran on for example early model PDP-11 computers that were comparable to Commodore 64 in terms of memory and processor performance there were architecture differences in terms of lack of a kernel mode, only 3 8-bit registers versus eight 16-bit general registers, and a fixed stack. These architectural limitations make implementing a Unix-like operating system on the 6502 challenging.Шаблон:Sfnp

The possible non-exhaustive list of other viable Unix-like implementations on 6502 are LUnix, Asterix (Chris Baird) and ACE (Chris "Polar" Baird). GeckOS arguably is more complete in some respects, with ACE being stronger in terms of standard Unix utilities but weaker in the operating system area.Шаблон:Sfnp

References

Sources

• Шаблон:Cite book
• Шаблон:Cite web
• Шаблон:Cite AV mediaШаблон:Cbignore
• Шаблон:Cite speech
• Шаблон:Cite web

External links

• Analysis, building instructions