written ST506 and ST412) were early hard disk drive products introduced by Seagate in 1980 and 1981 respectively, that later became construed as hard disk drive
Xebec's hard disk drive controller, and soon thereafter internal hard disk drives proliferated on personal computers, one popular type was the ST506/ST412 hard
retroactively named 8-bit ISA. The disk interface for the AT, originally a Seagate ST506 compatible interface on IBM's diskcontroller card, was updated and standardized
hard drive has an unusual 26-pin interface made by JVC, incompatible with ST506/412 or ATA interfaces. Floppy drives are connected using similar 26-pin
hardware expansion providing its own 80186 processor, a diskcontroller and connector for a disk drive. The PC Emulator in its initial form shipped with