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Author Topic: Switch on back of keyboard?  (Read 1583 times)

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Offline PortablePlatypus

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Switch on back of keyboard?
« on: Wed, 03 September 2014, 03:34:35 »
http://www.ebay.com/itm/261579910636 this acer of mine has a switch on the back. For some reason I can only get it to work on 2. I'm assuming that's normal, but I'm wondering what exactly it is for.
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Offline rowdy

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Re: Switch on back of keyboard?
« Reply #1 on: Wed, 03 September 2014, 06:00:34 »
I'm guessing maybe it switches the keyboard between AT, XT and something else?
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Offline Findecanor

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Re: Switch on back of keyboard?
« Reply #2 on: Wed, 03 September 2014, 06:56:38 »
I'm guessing that they are 1, 2 and 3 for XT AT(PS/2) and Terminal respectively.

The three are the same protocol at the lower levels, with the key codes and some behavioural details being different. The key code sets are internally numbered 1, 2  and 3.
There was a time when Microsoft wanted to transcend to using set 3 (Terminal) for Windows NT, but it didn't take off. I think the reason could have been that some popular non-IBM keyboards did not behave properly in set 3.
« Last Edit: Wed, 03 September 2014, 06:58:58 by Findecanor »
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Offline Daniel Beardsmore

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Re: Switch on back of keyboard?
« Reply #3 on: Wed, 03 September 2014, 16:33:32 »
Quote from: Findecanor on Wed, 03 September 2014, 06:56:38
I'm guessing that they are 1, 2 and 3 for XT AT(PS/2) and Terminal respectively.

The three are the same protocol at the lower levels, with the key codes and some behavioural details being different.

XT and AT are fairly different:

http://www.cs.cmu.edu/~jmcm/info/key2.txt

Then again, that page says that people use set 3, and everyone else says people use set 2 …
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