User`s manual

DIGITAL-LOGIC AG MSMP5 / P3 SEN/SEV Manual V1.6A

I/O Ad-

dress

Read/Write

Status

Description

I/O addresses 02F8h - 02FFh are reserved for use with serial port 2. See the bit defini-

tions for I/O addresses 03F8h - 03FFh.

02F8h W Transmitter holding register for serial port 2

02F8h R Receive buffer register for serial port 2

02F8h R / W Baud rate divisor (low byte) when DLAB = 1

02F9h R / W Baud rate divisor ( high byte) when DLAB = 1

02F9h R / W Interrupt enable register when DLAB = 0

02FAh R Interrupt identification register for serial port 2

02FBh R / W Line control register for serial port 2

02FCh R / W Modem control register for serial port 2

02FDh R Line status register for serial port 2

02FEh R Modem status register for serial port 2

02FFh R / W Scratch register for serial port 2 (used for diagnostics)

0300h –

031Fh

R / W ISA- LAN controller, if installed

(otherwise free for the user)

I/O addresses 0372h - 0377h are reserved for use with a secondary diskette controller.

See the bit definitions for 03F2h - 03F7h.

0372h W Digital output register for secondary diskette drive control-

ler

0374h R Status register for secondary diskette drive controller

0375h R / W Data register for secondary diskette drive controller

0376h R / W Control register for secondary diskette drive controller

0377h R Digital input register for secondary diskette drive controller

0377h W Select register for secondary diskette data transfer rate

0378h R / W

Data port for parallel port 1

0379h R Status port for parallel port 1

bit 7 = 0 Busy

bit 6 = 0 Acknowledge

bit 5 = 1 Out of paper

bit 4 = 1 Printer is selected

bit 3 = 0 Error

bit 2 = 0 IRQ has occurred

bit 1-0 = Reserved

Continued...