home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Mega CD-ROM 1
/
megacd_rom_1.zip
/
megacd_rom_1
/
DBASE
/
BILL21.ZIP
/
PF.DOC
< prev
next >
Wrap
Text File
|
1990-03-11
|
1KB
|
31 lines
If you are using DOS 3.3 or higher and have COM3 and/or COM4, DOS will
then recognize these ports and you will be able to use the DOS MODE
command.
DOS assigns COM and LPT numbers, from LOW to HIGH, to all responding I/O
ports in order as they are found and non-responding I/O ports addresses
are skipped.
MACHINE COMx I/O INT. MEM
ALL COM1 3F8 HEX IRQ4 40:00
ALL COM2 2F8 HEX IRQ3 40:02
PC/XT/AT COM3 3E8 HEX IRQ4 40:04
PC/XT/AT COM4 2E8 HEX IRQ3 40:06
PC/XT/AT COM5 2E0 HEX IRQ4 NONE
PC/XT/AT COM6 3E0 HEX IRQ3 NONE
PS/2 COM3 3220 HEX IRQ3 40:04
PS/2 COM4 3228 HEX IRQ3 40:06
PS/2 COM5 4220 HEX IRQ3 NONE
PS/2 COM6 4228 HEX IRQ3 NONE
PS/2 COM7 5220 HEX IRQ3 NONE
PS/2 COM8 5228 HEX IRQ3 NONE
SERIAL PORT COUNT IS AT MEM 40:11 BITS 2, 3, AND 4.