Gateway 386/33 User Manual page 60

Table 4-2. 1/0 addresses
and devices.
4-10 Gateway 2000 386/33 Computer System User's Guide
About I/O port addresses
Your Gateway 2000 system unit addresses both system
memory and I/O through special lines or conductors
called the bus. The bus carries codes, signals or power
from the microprocessor to all parts of the system. I/O
port addresses range from 0000h to FFFFh, for a total of
64K locations.
Inany given memory segment, the microprocessor can
address as many I/O locations as it can memory loca-
tions. Your system is able to access I/O devices through
a broad range of addresses. Standard assignments for I/
O port addresses have been established for many com-
mon input devices. Table 4-2 lists these address defini-
tions.
Base 1/O Address* Device 9
1FO - 1F8 Fixed disk
200 - 207 Game |/O
278 - 27F Parallel port 2 - LPT2
2E8 - 2EF Serial port 4 - COM4
2F8 - 2FF Serial port 2 - COM2
300 - 31F Prototype or network card
360 - 363 PC network (low address)
368 - 36B PC network (high address)
378 - 37F Parallel port 1 - LPT1
380 - 38F SDLC, Bisynchronous
3A0 - 3AF Bisynchronous (primary)
3B0 - 3BF Monochrome display and
printer adapter
3C0 - 3CF EGA/VGA
3D0 - 3DF CGA/MCGA
3E8 - 3EF Serial port 3 - COM3
3FO - 3F7 Diskette controller
3F8 - 3FF Serial port 1 - COM1