The first EKS Personal Unit model with CD-ROM was released in 1990.
- EK-6520 (1978) - first EKS Personal Unit model.
- EK-6530 (1979) - First model with a 3½-inch floppy disk drive and last model with a 5¼-inch floppy disk drive.
- EK-6540 (1981)
- EK-6550 (1983)
- EK-6560 (1984)
- EK-6570 (1985)
- EK-6580 (1987)
- EK-6585 (1988)
- EK-6590 (1990) - First model with CD-ROM.
- EK-6600 (1992)
- EK-6610 (1993)
- EK-6620 (1995) - The last EKS Personal Unit model.
The computer received positive reviews. It was commercially successful personal computers during late 1980s to early 1990s, along with TheoryDesk, Naisuka PCs and IBM-PC/MS-DOS.