Z-DOS was an OEM version of Microsoft's MS-DOS specifically adapted to run on the hardware of the Zenith Z-100 personal computer.The Z-100 used a 8086-family microprocessor, (the Intel 8088), but otherwise had a completely different internal architecture from the IBM PC.At the time Microsoft's MS-DOS wasn't specifically geared to any specific hardware platform, but could be tailored to run on most any system as long as it used a 8086-compatible microprocessor, a situation completely like with the popular CP/M systems of the time, which typically used a 8080-compatible (8080, 8085 and Z80 among others) microprocessor.