HT6551 - Holtek Microelectronics

HT6551 Super I/O Controller

The HT6551 super Multi I/O chip, is an advanced CMOS single chip controller offering the complete I/O solutions for the IBM AT environments. It incorporates one floppy disk controller (FDC), two full function UARTs, one parallel port, one bus mouse port, one game port controller, IDE hard disk drive interface, standard AT address decoding for on–chip functio.

Features

• 100% compatible to IBM PC AT/XT
• Fully IBM
  –BIOS compatible floppy disk controller
  – 48mA floppy drive interface buffers
  – Support two floppy drives with capability of supporting up to four drives with an external decoder
  – Support 360K/720K/1.2M/1.44M/2.88M formats
  – Support 250Kb/s, 300Kb/s, 500Kb/s, 1Mb/s data rate
• Digital data separator eliminates critical analog adjustments
• Two 16550 compatible UARTs
  – Independent control of transmit,receive,line status and data set interrupts on each channel
  – Individual modem control signals for each channel
  – Programmable serial interface charac-.