Donate SIGN UP

modems

Avatar Image
tcp | 20:49 Tue 14th Dec 2004 | Technology
3 Answers

The serial port has a 8250A UART. What are the main reasons why a modem might not work/  (Select all that apply)  A. I/O address conflict  B.  IRQ conflictr  C. DMA conflict  or D.  PnP jumper off while running a PnP BIOS???

Gravatar

Answers

1 to 3 of 3rss feed

Best Answer

No best answer has yet been selected by tcp. Once a best answer has been selected, it will be shown here.

For more on marking an answer as the "Best Answer", please visit our FAQ.
Well it won't be IRQ as the serial ports have their own (COM 1 =4, COM 2 = 3). I think they have their own I/O address ranges as well (03F8-03FF and 02F8-02FF) so I would say C and maybe D. Do I win a prize?
As far as I know, UARTs don't use DMA so I'd say D.  Non PnP hardware can still run with a PnP BIOS.
D'oh... reread the question.  So  from my reasoning C (just read, 8250 doesn't support DMA, 16550 and above does) and D are elminiated.  A and B could be possibilities as they can be changed.

1 to 3 of 3rss feed

Do you know the answer?

modems

Answer Question >>