UM8398 Datasheet (Unicorn Microelectronics)

UM8398, Floppy Disk Controller

The UM8398 is a VLSI Floppy Disk Controller (FDC) chip, which contains the circuitry and c9ntrol functions for interfacing a processor with up to 2 floppy disk drives.

It Is capable of supporting 360K Bytes, 1.2M Bytes (in 5%'' diskette drives), 720K Bytes, and 1.44M Bytes, (in 3Y:i'' diskette drive

UM8398 Features

* IBM PC XT/AT drive system compatible

* Supports 2 drives (MS-DOS support)

* 1.2M/360K/720K format selectable .

* IBM PC drive system address decoder

* Only 3 components for the drive

* Internal write precompensation circuit; precompensation values: