Microsoft, IBM release source code of 1988's MS-DOS 4.00

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[{"selector":"#anim-bfd88302-1ed5-408f-b25f-cf134970c693","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-2ba77e75-ed49-4128-93d0-71d67b75a0b6","keyframes":{"opacity":[0,1]},"delay":0,"duration":1200,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ec1e5e42-1a6d-42fc-989b-f5b1f9c99d41","keyframes":{"transform":["translate3d(0px, 191.47784%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":1200,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f5b897d2-f096-4535-818b-333e1ad9524f","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-c080dd6b-a9d4-49e9-9ee6-de73004ca453","keyframes":{"transform":["translate3d(-1636.36234%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] View More Arrow The original plan for MS-DOS 4.00 was to introduce new multitasking features, enabling software to operate in the background.

[{"selector":"#anim-e9d15f3d-22d6-4b12-872d-7c798726df6d","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ffc498e2-0170-428e-b0cb-417cbee13383","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-a0817420-ca75-4908-9e5a-2d0260e3e30a","keyframes":{"transform":["translate3d(-1636.36234%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-db09d837-a333-4834-a8d2-b551fde9c03e","keyframes":{"opacity":[0,1]},"delay":0,"duration":1200,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-bcf3be27-49e2-47c8-ab98-82816da20168","keyframes":{"transform":["translate3d(0px, 191.47784%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":1200,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] View More Arrow Microsoft's Open Source Programs Office attempted to locate the complete source code for MT-DOS, but their efforts were unsuccessful.

[{"selector":"#anim-b5e32b70-83a6-436d-98dc-a3637878cd65","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-1a10050b-7705-4fc5-bcd2-57fcf2894350","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-83f33408-7b18-4655-bf6b-a757dc589881","keyframes":{"transform":["translate3d(-1636.36234%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-219336e0-6cf3-4c8e-82e4-474bfabdcafe","keyframes":{"opacity":[0,1]},"delay":0,"duration":1200,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-6921840a-62df-4b04-b7dc-f49b276ea8d9","keyframes":{"transform":["translate3d(0px, 252.84898%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":1200,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] View More Arrow The publicly accessible version of MS-DOS 4.00 is more recognized for its high memory usage than its new features.

[{"selector":"#anim-699bb842-f51d-4095-94b7-f4cc54f78d07","keyframes":{"opacity":[0,1]},"delay":0,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-630961f7-1b5f-4fe0-aa41-8312fd61ac22","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-a916fb12-3fdc-4d0e-a54f-15646550f022","keyframes":{"transform":["translate3d(-1636.36234%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e27854fd-4b84-4520-8f4b-50ace26348db","keyframes":{"opacity":[0,1]},"delay":0,"duration":1200,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-51366250-9199-4a45-9220-7f6fe6eabfff","keyframes":{"transform":["translate3d(0px, 252.84898%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":1200,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] View More Arrow Microsoft has shared some documentation, as well as binary files for MT-DOS and may update this release if more is discovered.

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