Mailinglist Archive: opensuse-factory (520 mails)

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Re: [opensuse-factory]

On Thursday 2017-05-04 21:59, Carlos E. R. wrote:
On 2017-05-04 16:27, Jan Engelhardt wrote:

What I meant is that "outb 0x61,..." will always succeed (even if there
is no speaker connected to the two pins) - unlike outb to 0x170 ports
(disk), which won't give you something usable if the disk is missing ;-)

Well, of course. You only need the timer chip to be there, and it is so
basic, from the original IBM PC, that the ports will always be there. No
need for the speaker to be connected.

Another thing is if you say that the speakers sounds even if not
connected - is that it? Some hardware on the keyboard? :-?

Beepers were also in keyboards (especially in the terminal era).
I could be wrong, but IIRC the moderately modern Sun4 keyboard still
had one integrated.

But what I really mean is that the x86 KBC provides the "API" to sound
the bell, and this API is always there, even if a sound-emitting (such
as a speaker a.k.a. electromagnet+membrane) or a sound-visualizing
device (such as an oscilloscope) is not present. Just like you can
always make a sound card play or a video card render something even if
no speakers/monitor is connected.

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