Hard Disk Drive Controller Registers; Serial Port Controller Registers - Mitsubishi Electric LS Pro Hardware Technical Reference

Memory and I/O Usage

Hard disk drive controller registers

The hard disk drive embedded controller is accessed at the locations given in the
following table.
Address
01F0
01F1
01F1
01F2
01F3
01F4
01F5
01F6
01F7
01F7
03F6
03F6
03F7
These ports are defined in ANSI specification: ATA (AT attachment) X3T9.2/9-143.

Serial port controller registers

Each serial port controller has several accessible registers which are for control and
data transfer. The following table shows where each register is located in I/O space for
each port.
COM1
03F8
03F8
03F8
03F9
03F9
03FA
03FB
03FC
03FD
03FE
03FF
The registers are described in detail in the manufacturers data sheets.
Note
Rev C system boards are not fitted with the second serial port (COM2).
5/14 LS PRO HARDWARE TECHNICAL REFERENCE
R/W Function
R/W Data register
R Error register
W Write precompensation cylinder register
R/W Transfer sector count
R/W Starting sector count
R/W Low byte of cylinder number
R/W High byte of cylinder number
R/W Drive/head select register
R Status register
W Command register
R Fixed disk status register
W Fixed disk control register
W Fixed/floppy disk digital input register
COM2 R/W Register
02F8 W Transmit data register (DLAB=0)
02F8 R Receive data register (DLAB=0)
02F8 R/W Divisor latch, low byte (DLAB=1)
02F9 R/W Divisor latch, high byte (DLAB=1)
02F9 R/W Interrupt enable register (DLAB=0)
02FA R Interrupt ID register
02FB R/W Line control register
02FC R/W Modem control register
02FD R Line status register
02FE R Modem status register
02FF R/W Scratch register