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Scratch Pad
1x
Always Enabled
Memory
Mapped
Loopback
0052
Scratch Pad
8x
DTR Controlled
Any
Clocking
0051
Scratch Pad
8x
DTR Controlled
Any
Handshaking
0050
Scratch Pad
8x
RTS Controlled
Any
Clocking
0049
Scratch Pad
8x
RTS Controlled
Any
Handshaking
0048
Scratch Pad
8x
Auto Toggle
Any
Clocking
0047
Scratch Pad
8x
Auto Toggle
Any
Handshaking
0046
Scratch Pad
Normal
DTR Controlled
Any
Clocking
0045
Scratch Pad
Normal
DTR Controlled
Any
Handshaking
0044
Scratch Pad
Normal
RTS Controlled
Any
Clocking
0043
Scratch Pad
Normal
RTS Controlled
Any
Handshaking
0042
Scratch Pad
Normal
Auto Toggle
Any
Clocking
0041
Scratch Pad
Normal
Auto Toggle
Any
Handshaking
0040
Scratch Pad
8x
Always Enabled
Any
Clocking
0039
Scratch Pad
8x
Always Enabled
Any
Handshaking
0038
Scratch Pad
8x
DTR Controlled
Any
Loopback
0037
Scratch Pad
8x
RTS Controlled
Any
Loopback
0036
Scratch Pad
8x
Auto Toggle
Any
Loopback
0035
Scratch Pad
Normal
Always Enabled
Any
Clocking
0034
Scratch Pad
Normal
Always Enabled
Any
Handshaking
0033
Scratch Pad
Normal
DTR Controlled
Any
Loopback
0032
Scratch Pad
Normal
RTS Controlled
Any
Loopback
0031
Scratch Pad
Normal
Auto Toggle
Any
Loopback
0030
Scratch Pad
8x
Always Enabled
Any
Loopback
0029
Scratch Pad
Normal
Always Enabled
Any
Loopback
0028
ISR
8x
DTR Controlled
Any
Clocking
0027
ISR
8x
DTR Controlled
Any
Handshaking
0026
ISR
8x
RTS Controlled
Any
Clocking
0025
ISR
8x
RTS Controlled
Any
Handshaking
0024
ISR
8x
Auto Toggle
Any
Clocking
0023
ISR
8x
Auto Toggle
Any
Handshaking
0022
ISR
Normal
DTR Controlled
Any
Clocking
0021
ISR
Normal
DTR Controlled
Any
Handshaking
0020
ISR
Normal
RTS Controlled
Any
Clocking
0019
ISR
Normal
RTS Controlled
Any
Handshaking
0018
ISR
Normal
Auto Toggle
Any
Clocking
0017
ISR
Normal
Auto Toggle
Any
Handshaking
0016
ISR
8x
Always Enabled
Any
Clocking
0015
ISR
8x
Always Enabled
Any
Handshaking
0014
ISR
8x
DTR Controlled
Any
Loopback
0013
ISR
8x
RTS Controlled
Any
Loopback
0012
* Indicates “COM” mode addressing. Addresses 3F8, 2F8, 3E8, and 2E8 are the standard
addresses for COM1, COM2, COM3, and COM4, respectively. Windows 95/98/ME enumerates
any COM port at a non-standard address starting with COM5.
Windows 2000 4-14