Version 3.2 could also handle the IBM PC Convertible and its 3½-inch 720K floppies. Version 3 could also handle the IBM PC AT, its 20-megabyte and 30-megabyte hard disks, and its high-density 5¼-inch floppy disks (which held 1.2 megabytes instead of 360K). Version 2.1 could also handle the IBM PC Junior. ![]() That version also squeezed more data onto each floppy disk: onto each track, it put 9 sectors instead of 8, so the floppy disk held 360K instead of 320K. Version 2 could also handle the IBM PC XT and its 10-megabyte hard disk. Version 1.1 could write on both sides of each disk, so that each disk held 320K. That version wrote on just one side of each disk and put 8 sectors on each track, so that each disk held 160K. Version 1 handled just the original IBM PC and its 5¼-inch floppy disks. Then came an improvement called version 1.1. The original version of PC-DOS was called version 1. Here’s how Microsoft and IBM gradually improved PC-DOS (which is the IBM PC version of MS-DOS). If you use the wrong version of DOS - for example, if you try using PC-DOS on a Compaq computer, or using Compaq DOS on a different brand of clone - the computer might gripe (especially when you try programming in BASIC) or give you the wrong time or do something else weird. Get it from the dealer who sold you the computer. Get the MS-DOS version intended for your computer. ![]() Versions for clones built by Compaq are called Compaq DOS. Versions for the IBM PC are called PC-DOS. Also, MS-DOS runs well and fast even on old, decrepit, or broken computers, whereas Windows usually runs slowly or erratically or not-at-all. ![]() Technicians repairing computers rely on MS-DOS. When you give a Windows command, you can’t be sure of the consequences: Windows is flaky and full of unfortunate surprises. MS-DOS commands are trustworthy: when you give an MS-DOS command, you know exactly what will happen. They solve the difficulties caused when Windows acts strangely or conks out - which happens often! MS-DOS commands are worth learning because they give you total control over your computer. This chapter explains how to give MS-DOS commands. If you have an IBM-compatible computer, it understands MS-DOS commands - even if your computer comes with Windows.
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