Ms dos 5.0 free download6/14/2023 MS reluctantly released this as MS-DOS 4. IBM did its own thing, and added big disk support, code page switching for international character sets, and a slightly clunky graphical launcher called DOSShell. MS had a project to do a multitasking DOS 4 so didn't work on DOS 3.3 for ages. The method used in Compaq DOS 3.31 is the one IBM and MS picked and it was used in DOS 4. Other companies started tweaking their version of MS-DOS 3.3 to allow bigger than 32MB drives. Then in another point release, multiple "logical drives" in a single extended partition, so you could use all the space on a big drive. Then in a point release, support for 2 partitions per disk. You couldn't buy it directly.ĭOS 2: added hard disk support (a single one) and subdirectories.ĭOS 3: added support for 2 hard disks and networking. MS-DOS came with everything else, but only with the computer. Compaq reverse-engineered the IBM BIOS and built the first clones, and the PC industry started from there. So in the early days, there were other MS-DOS machines that weren't IBM compatible, such as the Apricot, Victor and Sirius.īut soon it became apparent that IBM compatibility was key. MS did a great deal when supplying DOS to IBM MS retained the rights to sell it itself to other manufacturers. The evolution of DOS is interesting, and few remember the bigger picture now.
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