what oprocessor did IBM use int heir PC?
16-bit
who did IBM initially approach?
Bill Gates
why did they talkk to him?
possibly believing that Microsoft owned CP/M
what card might have given that impression?
the Microsoft Z-80 SoftCard
what did that do?
allowed CP/M to run on an Apple II
what does DOS stand for?
disk operating systems
name 2 main versions?
MS-DOS and  IBM PC DOS
when were they introduced?
in 1981
which market did MD-DOS dominate?
the x86-based IBM PC compatible market
what years?
1981 and 1995
what year was FreeDOS launched?
1998
what launched in 1988
DR-DOS
which  mainframe OS uses the acronym?
DOS/360
how many Apple versions were there?
Two
name one
Apple ProDOS