Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non re-entrant.

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  • Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non re-entrant. Versions 0.10 to 1.20 were used on the BBC Micro, version 1.00 on the Electron, version 2 was used on the B+, and versions 3 to 5 were used in the BBC Master Series range. The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS. Its operating system used portions of the Acorn MOS architecture and shared a number of characteristics (commands, VDU system) with the earlier 8-bit MOS. Versions 0 and 1 of the MOS were 16KiB in size, written in 6502 machine code, and held in ROM on the motherboard. The upper quarter of the 16-bit address space (0xC000 to 0xFFFF) is reserved for its ROM code and I/O space. Versions 2 to 5 were still restricted to a 16KiB address space but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 CPU with its denser instruction set plus the careful use of paging.
  • O MOS (Machine Operating System) da Acorn foi um sistema operacional usado na linha de microcomputadores Acorn BBC. Ele incluía suporte para som em quatro canais e gráficos, abstração de sistema de arquivos e E/S digital, incluindo um barramento de expansão rápida. A implementação era monotarefa, monolítica e não-reentrante. As versões de 0.1 a 1.2 foram usadas no BBC Micro, a versão 2 foi usada no B+, e as versões 3 a 5 foram usadas na série BBC Master. O último BBC Micro, o BBC A3000, era de 32 bits e executava RISC OS. O MOS foi derivado em grande parte do firmware utilizado nos sistemas Acorn anteriores. Algumas partes da arquitetura Acorn MOS froam posteriormente aproveitadas como base para a arquitetura dos sistemas operacionais de 32 bits Arthur e RISC OS. O MOS ocupa 16 KiB em ROM na placa-mãe. Reserva o quarto superior do espaço de endereçamento de 16 bits (0xC000 a 0xFFFF) para seu código ROM e espaço de E/S. As versões 0 e 1 foram escritas em código-máquina 6502. No BBC Master, a UCP 6502 do BBC Micro foi substituída por uma 65C102, a qual, com um conjunto maior de instruções, permitia alocar mais códigos no mesmo espaço de 16 KiB, possibilitando a expansão do sistema operacional.
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  • Early 1986
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  • v5
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  • Acorn Machine Operating System
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  • BBC BASIC, 6502 Assembler
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dbpprop:released
  • Late 1981
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  • Proprietary
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  • Replacement ROMs
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  • Historic
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  • Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non re-entrant.
  • O MOS (Machine Operating System) da Acorn foi um sistema operacional usado na linha de microcomputadores Acorn BBC. Ele incluía suporte para som em quatro canais e gráficos, abstração de sistema de arquivos e E/S digital, incluindo um barramento de expansão rápida. A implementação era monotarefa, monolítica e não-reentrante. As versões de 0.1 a 1.2 foram usadas no BBC Micro, a versão 2 foi usada no B+, e as versões 3 a 5 foram usadas na série BBC Master.
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  • Acorn MOS
  • Acorn MOS
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