Not to be confused with Acorn OS (prototype code name succeeded by iPhone OS 1[1]).
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The Machine Operating System (MOS)[2] 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.
^Rare iPhone P-series prototypes run Acorn OS (video). YouTube: Cult of Mac. 2017-06-29. Event occurs at 3:46. Archived from the original on 2021-12-21. Retrieved 2019-01-05.
^Cite error: The named reference bbcug was invoked but never defined (see the help page).
The Machine Operating System (MOS) or OS is a discontinued computer operating system (OS) used in Acorn Computers' BBC computer range. It included support...
operating system, operating systems for mobile devices AcornMOS, an operating system used in the Acorn BBC computer range Media Object Server, a protocol...
a progression of the MOS Technology 6502-based machines that the company had been making from 1979. The Atom was a cut-down Acorn System 3 without a disk...
and a faster 2 MHz MOS Technology 6502 central processing unit. The machine was only at the design stage at the time, and the Acorn team, including Steve...
(DFS) is a computer file system developed by Acorn Computers, initially as an add-on to the Eurocard-based Acorn System 2. In 1981, the Education Departments...
faster 6502. The Acorn System 1, initially called the Acorn Microcomputer (Micro-Computer), was intended for hobbyists. It was based on the MOS 6502 CPU, and...
The Acorn Electron (nicknamed the Elk inside Acorn and beyond) was a lower-cost alternative to the BBC Micro educational/home computer, also developed...
versions of Acorn's 6502 based HI-BASIC have also been experimentally run on C64, with an interface to the C64 Kernel, replacing the AcornMOS calls otherwise...
which were especially popular in the UK, including the Acorn Electron and the Acorn Archimedes. Acorn's BBC Micro computer dominated the UK educational computer...
S J Research. Econet was supported by AcornMOS, RISC OS, RISC iX, FreeBSD and Linux operating systems. Acorn once received an offer from Commodore International...
had become the logical successor to the MOS team and was offering new versions like the WDC 65C02. The Acorn team saw high school students producing chip...
Center 65816 chip rather than the 8-bit MOS Technology 6502 or variants, which were used by virtually all of Acorn's previous microcomputer products. 128 KB...
user BOOT). The latter two behaviours were inherited by the successor to AcornMOS, RISC OS. These behaviours could be changed or exchanged in software,...
The MOS Technology 6502 (typically pronounced "sixty-five-oh-two") is an 8-bit microprocessor that was designed by a small team led by Chuck Peddle for...
The Acorn System 1, initially called the Acorn Microcomputer (Micro-Computer), was an early 8-bit microcomputer for hobbyists, based on the MOS 6502 CPU...
cassette and ROM filing systems and the Advanced Disc Filing System of AcornMOS feature a rudimentary copy protection mechanism where a file with a certain...
electronics, the metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated...
The BBC Master is a home computer released by Acorn Computers in early 1986. It was designed and built for the British Broadcasting Corporation (BBC)...
granted in 1967. RCA commercialized the technology with the trademark "COS-MOS" in the late 1960s, forcing other manufacturers to find another name, leading...
computing file system unique to the Acorn computer range and RISC OS-based successors. Initially based on the rare Acorn Winchester Filing System, it was...
produced in large numbers by highly automated metal–oxide–semiconductor (MOS) fabrication processes, resulting in a relatively low unit price. Single-chip...
1976, Peter R. Jennings for instance created his Microchess program for MOS Technology's KIM-1 kit, but since it did not come with a tape drive, he would...
originally designed by Acorn Computers Ltd in Cambridge, England. First released in 1987, it was designed to run on the ARM chipset, which Acorn had designed concurrently...
Cursor, Copy-Cursor or CopyCursor may refer to: Copy Cursor (Acorn), a feature in AcornMOS since 1981 and RISC OS since 1987 Copy Cursor (CPC), a feature...
Proton from Acorn Computers was selected. A number of minor changes were made resulting in the BBC Micro (released 1981). The machine was MOS 6502 based...
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