Rom; Serial & Parallel Port Assignments - Philips PCL304 Service Manual

Conventional Memory:
Extended Memory:
Expanded Memory:
Shadow Memory:
NOTE:
2.2.4 ROM
In the area from 512 Kbyte to 576 Kbyte
(0E0000 h - OEFFFF h)
2.2.5 VO Connections
embedded hard disk drives
DB-9P, serial port connector. Via the SETUP program
this port can be disabled, or can be configured as
PORT 1. PORT 1 has the base I/O address 3F8h.
For COM port assignments, refer to subsection
2.2.4.1.
CN:
2-3
Ji: DP-25P, serial port connector. Via the SETUP program
this port can be disabled, or can be config/ted as
PORT 2. PORT 2 has the base I/O address of 2F8h.
For COM port assignments, refer to subsection
2.2.4.1.
DB-25S, parallel port connector. Via the SETUP pro-
gram this port can be disabled, or can be ¢Onfigured
as PORT 2. PORT 2 has the base I/O address 378h.
For LPT port assignments, refer to subsection
2.2.4.1.
CN4:
CN1: DB-15S, analog video connector. This pot can be
disabled/ enabled via software, [Fn] + [F10}.
CN14: 6-pin, Mini-Din type keypad connector. This port sup-
ports AT compatible types only.
CN13: 6-pin, Mini-Din type PS/2 Mouse connector. This port
supports PS/2 compatible types only.
2.2.6 Serial And Parallel Port Assignments
The serial ports require eight consecutive I/O addresses for
access to the control and status registers. COM1is always
assigned to the highest /O address (when using only one
port, this may be either on 2F8h or 3F8h). If two serial ports
are installed COM2 is assigned to the next lower I/O ad-
dress (COM1 is assigned to 3F8h and COM2 is assigned to
2F8h). The table on the next page gives the three possible
configurations:
Configuration Base Port Base Port
Addr. Addr.
1 - - 2F8h COM1
2 3F8h COMi - -
3 3F8h COM1 2F8h COM2
Fig. 2-3
The parallel ports require three consecutive I/O addresses
for access to the control, status and data registers. LPT1 is
always assigned to the highest /O address available (when
using one parallel port, this may be on 278h, 378h or
3BCh). If two parallel ports are installed, LPT2 is assigned
to a lower V/O address. If three parallel ports are installed,
LPT3 is assigned to the lowest I/O address. The following ta-
ble gives the seven possible configurations:
Configu- Base Port Base Port Base Port
ration Addr. Addr. Addr.
1 - - - - 278h LPTi
2 - - 378h LPT1 - -
3 3BCh LPT1 - - - -
4 - - 378h LPT1 278h LPT2
5 3BCh LPT1 - - 278h LPT2
6 3BCh LPT1 378h LPT2 - -
7 3BCh LPT1 378h LPT2 278h LPT3
Fig. 2-4
CS 55 800