 In 1978, "Standalone Disk BASIC-80" was ported to the 8086 using an emulator on a DEC PDP-10, since no real 8086 systems were available at this time.The FAT file system was also used in Microsoft's MDOS/MIDAS, an operating system for 8080/Z80 platforms written by McDonald since 1979.The "Standalone Disk BASIC" version supported three FATs, whereas this was a parameter for MIDAS.