DIGITAL-LOGIC AG
PCCP5 Manual V2.3
52
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
LAN controller if installed
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...
