COM port??

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Lee - 28 Sep 2004 20:01 GMT

Hello,

In PC, what are COM ports?They are serial com ports, right? In my
computer, I find 4 ports: COM1, COM2, COM3, COM4. But I only see two
serial ports: (RS232). Where the other ports?

Modem seems using COM3. Modem is a PCI card. I feel confused why is
Modem considered as COM port device?

Thanks,

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Gregory Weston - 28 Sep 2004 21:29 GMT

> Hello,
>
[quoted text clipped - 4 lines]
> Modem seems using COM3. Modem is a PCI card. I feel confused why is
> Modem considered as COM port device?

Because that's how shrink-wrapped software knows how to interact with
it. And this is really OT here.

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Wayne C. Morris - 28 Sep 2004 22:38 GMT

> In PC, what are COM ports?They are serial com ports, right? In my
> computer, I find 4 ports: COM1, COM2, COM3, COM4. But I only see two
> serial ports: (RS232). Where the other ports?

Why are you asking about PCs in a Mac newsgroup? Lucky for you I'm feeling
generous enough today to give quick answers to your off-topic questions...

PCs define those 4 names for serial ports, but most PCs are built with only
2 serial ports. People can add a card to get more serial ports.

> Modem seems using COM3. Modem is a PCI card. I feel confused why is
> Modem considered as COM port device?

1) Because PC apps see it as a serial port that's connected to an external
modem.

2) Because COM = communications.

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Mac Forum / General / Networking / September 2004

COM port??