2-2 Chapter 2: Hardware Installation
Echo
User's Manual, ver. 0.00
Port Addresses
You configure port addresses with DIP switches 1 to 5 on SW1.
Switches 3 to 5 select a set of port addresses for the ports, while
you can override the setting for port 1 and 2 with switch 1 and 2
respectively. When DIP switch 1 is on, then port 1 is COM1 at
3F8 hex. If DIP switch 2 is on then port 2 is COM2 at 2F8 hex.
These settings will override the addresses specified by DIP
switches 3, 4 and 5. Please refer to
Figure 2
for a description of
switch block SW1, while
Tables 1
and
2
provide the switch
settings for the various port address sets
However many other devices may require port addresses in your
computer's I/O address space. In most cases the factory setting is
sufficient, but when there is a conflict, SW1 may require a
different setting.
Table 1
summarizes typical I/O port address
usage.
WARNING
Do not use a pencil to set the DIP switches as the lead graphite
may short-circuit the switch.
Table 1:
Typical port address usage
Port Address (Hex) Usage
000 - 0FF
Reserved
170 - 177
Fixed disk controller (primary)
1F0 - 1F7
Fixed disk controller (secondary)
200 - 207
Game port
278 -27F
Parallel port (LPT2)
2C0 - 2CF
EGA video adapter (#2)
2F8 - 2FF
Asynchronous serial port (COM2)
360 - 36F
Parallel port (LPT1)
370 - 377
Floppy disk controller (secondary)
378 - 37F
Parallel port (LPT1)
380 - 38F
SDLC adapter (#2)
3A0 - 3AF
SDLC adapter (#1)
3B0 - 3BF
Video adapters
3F0 - 3F7
Floppy disk controller (primary)
3F8 - 3FF
Asynchronous serial port (COM1)
