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swCHIP 1991 January
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swCHIP_95-1.bin
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carbcopy
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setcom.tx_
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setcom.tx
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Text File
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1995-12-11
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2KB
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59 lines
USING THE SETCOM UTILITY (USING COM3 OR COM4)
=============================================
When to use SETCOM
------------------
In many systems Windows will not recognize serial ports COM3
and COM4. This is usually because the port addresses have not
been written into the BIOS data area by the machine's BIOS at
boot time. This problem may be solved by running SETCOM
before you run Windows. SETCOM will store either a default PC
COM port address or a custom port address into your BIOS data
area, allowing Windows to find and use the port.
In most cases you will need only the default address for the
port you will be using. For example, if you want to run
Windows and need to use COM3, before starting windows type:
SETCOM 3
If you also need COM4, type...
SETCOM 4
These commands may also be placed in your AUTOEXEC.BAT file so
that they take effect each time your PC is powered on.
You may use SETCOM for any port, COM1 through COM4, though you
will usually only need it for COM3 and COM4.
Custom Addresses
----------------
If you have a serial communications board which is set to a
non-standard address, you may use SETCOM to let Windows know
about it. Type SETCOM followed by the port number and the
address. For example:
SETCOM 3 300
This writes the HEX value '300' in the third port address
position (40:04 - 40:05) in your system's BIOS data area.
Refer to the manual for your serial board to determine the
address to use.
Using "Custom" Port Settings
----------------------------
Your serial board may also require a different IRQ setting.
You may set your IRQ and address by selecting CUSTOM in Port
Settings under Options in the Carbon Copy main menu. Refer to
the User Guide for more information.
Keep in mind however, that even if you use the Custom settings
selection in Carbon Copy for Windows, you will still need to
properly set your port address using SETCOM before Windows is
loaded when using COM3 or COM4.
End of File