- CP/M-86 is a discontinued version of the CP/M operating system that Digital Research (DR) made for the Intel 8086 and Intel 8088. The system commands are the same as in CP/M-80. Executable files used the relocatable .CMD file format.[nb 1] Digital Research also produced a multi-user multitasking operating system compatible with CP/M-86, MP/M-86, which later evolved into Concurrent CP/M-86. When an emulator was added to provide PC DOS compatibility, the system was renamed Concurrent DOS, which later became Multiuser DOS, of which REAL/32 is the latest incarnation. The FlexOS, DOS Plus, and DR DOS families of operating systems started as derivations of Concurrent DOS as well.
- Macintosh 512Ke (Wikipedia)
The Macintosh 512K enhanced (512Ke) was introduced in April 1986 as a cheaper alternative to the top-of-the-line Macintosh Plus, which had debuted three months previously. It is the same as the Macintosh 512K but includes the 800K disk drive and 128K of ROM used in the Macintosh Plus. The new ROM supported HFS used on 800K and larger disks and allowed the Hard Disk 20 to be used as a startup disk, doing away with the Hard Disk 20 Startup floppy required by the prior Macintosh 512K. Like its predecessors, the 512Ke has little room for expansion. Some companies did create memory upgrades to bring the machine up to 2 MB or more.