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The Machine Operating System (MOS) or OS i … The Machine Operating System (MOS) or OS is a discontinued computer operating system (OS) used in Acorn Computers' BBC computer range. It included support for four-channel sound, graphics, file system abstraction, and digital and analogue input/output (I/O) including a daisy-chained expansion bus. The system was single-tasking, monolithic and non-reentrant. 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. The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS, which kept on portions of the Acorn MOS architecture and shared a number of characteristics (e.g. "star commands" CLI, "VDU" video control codes and screen modes) with the earlier 8-bit MOS. Versions 0 to 2 of the MOS were 16 KiB in size, written in 6502 machine code, and held in read-only memory (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 3 to 5 were still restricted to a 16 KiB address space, but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 central processing unit (CPU) with its denser instruction set plus the careful use of paging.uction set plus the careful use of paging.
, O MOS (Machine Operating System) da Acorn … 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.litando a expansão do sistema operacional.
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O MOS (Machine Operating System) da Acorn … 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.a monotarefa, monolítica e não-reentrante.
, The Machine Operating System (MOS) or OS i … The Machine Operating System (MOS) or OS is a discontinued computer operating system (OS) used in Acorn Computers' BBC computer range. It included support for four-channel sound, graphics, file system abstraction, and digital and analogue input/output (I/O) including a daisy-chained expansion bus. The system was single-tasking, monolithic and non-reentrant. 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.3 to 5 were used in the BBC Master series.
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Acorn MOS
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