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Allen had previously tried, without success, writing the simulator on the IBM System/360 at Washington State University, where he was studying computer science.

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On a summer job at Vancouver, Washington working for TRW, a contractor for the Bonneville Power Administration, in his spare time Paul Allen adapts the PDP-10 Macro Assembler and DDT debugger to create an 8008 simulator that lets Bill Gates develop code for their 8008-based Traf-O-Data computer built by Paul Gilbert. Nearly all new computers, regardless of size, now come with a semiconductor memory or a choice between semiconductors and cores. It's slow compared with 1kb RAMs such as the p-MOS 1103 and the n-MOS 2105.

In July, Intel debuts its model 2107 4,096-bit (4- kilobit) n-MOS RAM, which competes with 4kb RAMs from TI, Mostek and Microsystems International. The Intellec 8 supported a Teletype operating at 110 baud, a high speed punched tape reader and a CRT terminal at 1200 baud. The Intellecs have resident monitors stored in ROMs. ДЄt the June National Computer Conference in the New York Coliseum, Intel introduces two microcomputers, the Intellec 4 ( 4004) and 8 (8008). Kildall also wrote an 8008 simulator in Fortran IV. However, the 8008's seven-level subroutine call stack is too small to support a self-hosted compiler. It's a cross compiler written in ANSI standard Fortran IV so it will run on most computers, including a PDP-10. Gary Kildall, a Naval Postgraduate School instructor and consultant to Intel, writes PL/M for the 8008, the first programming language and first compiler specifically for microprocessors. IBM introduces Winchester hard disk drive technology with the IBM 3340 direct access storage device for use on their System/370 mainframes. The 8-bit 8008 has a 14-bit address bus that can address 2 14 (16,384) memory locations, or 16 KB of memory. The Intel 8008-based Micral N, the first personal computer using a microprocessor, is offered for sale.

Each diskette can hold as much data as 3,000 standard 80-column punched cards. It uses IBM's first read/write diskette, a single-sided 8-inch-diameter ' memory disk'-a new recording medium to replace punched cards. IBM introduces the IBM 3740 data entry system. Intel claims its first two microcomputers command about 99% of the market which Fairchild Semiconductor, National Semiconductor and Rockwell International have joined. It can be programmed in two minutes using Intel's punched paper tape-actuated programmer, and erased as often as needed by shining an ultraviolet light through a transparent quartz cap on the package. Intel introduces the 2048- bit (256- byte) erasable 1702A EPROM chip. Intel's support for system-building includes SIM4-01 and SIM8-01 prototyping boards that form functioning micro computers, programmable read-only memory (PROM) programmers, and a PROM-based assembler. Microcomputers are increasingly used in systems too small or slow to warrant use of minicomputers. Some 200 Intel customers have used the MCS-4 and MCS-8 microcomputer chip sets introduced in 19 in more than 60 applications, including: point-of-sale terminals typewriter-sized general-purpose data processing machines that tabulate accounts, type invoices, and write checks and personalized form letters process controllers for automatic bottle-loading machines and a front-end processor in a dial-up communications controller.

Hard disk drive, subdirectories, device driversДЈ 1вЃ„ 2-inch 1.44 MB floppy support, extended partitions Major market-leading releases and releases introducing significant new technology

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Free download вЂ“ starting with OpenDOS 7.01 in 1997, followed by FreeDOS alpha 0.05 in 1998 (FreeDOS project was announced in 1994)ДЇurther information: В§В 1980вЂ“1995: Important events in DOS history First end-user releases of IBMвЂ“Microsoft-compatible versions.

DR-DOS began selling to end users with version 5.0 in July 1990, followed by MS-DOS 5.0 in June 1991

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End-user retail вЂ“ all versions of IBM PC DOS (and other OEM-adapted versions) were sold to end users.

Shrink wrap packaged product for smaller OEMs ( system builders) вЂ“ starting with MS-DOS 3.2 in 1986, Microsoft offered these in addition to OAKs.

OEM adaptation kits (OAKs) вЂ“ all Microsoft releases before version 3.2 were OAKs only.

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Non-x86 operating systems named 'DOS' are not part of the scope of this timeline.ДЄlso presented is a timeline of events in the history of the 8-bit 8080-based and 16-bit x86-based CP/M operating systems from 1974 to 2014, as well as the hardware and software developments from 1973 to 1995 which formed the foundation for the initial version and subsequent enhanced versions of these operating systems. This article presents a timeline of events in the history of 16-bit x86 DOS-family disk operating systems from 1980 to 2020.