connect a IBM model m keyboard \ VOGONS

connect a IBM model m keyboard

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First post, by rendo

Posted on 2012-05-12, 06:11

rendo Offline

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Hello,
I've got an old IBM model M clicky keboard, it has an Ps2 plug. I want to connect it to my 486dx4 computer. The computer has an biostar 8433 motherboard with a DIN connection on it. The problem is the computer doesn't recognize the keyboard when i connect it with an ps2 to din adapter.
I tried to connect is to my other computer wich has an ps2 connection and it works fine. Does anybody know why it doesnt works on 486?

Reply 1 of 8, by luckybob

Posted on 2012-05-12, 07:11

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it might be the wrong adapter, is the only thing I can think of. That or the adapter has something wrong with it. Most people dont realize there are TWO different connectors that use the big smiling lug. The original IBM XT used it and it was incompatible with later keyboards. At least thats how I remember it. Test another ps/2 keyboard with that adapter and the 486. if it still doesnt work, the adapter is the issue.

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Reply 2 of 8, by rendo

Posted on 2012-05-12, 15:34

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Oke the test with another keyboard with ps/2 also failed with the adapter, so the adapter is not the right one. I think i have to make a adapter myself.
Thanks for so far.

Reply 3 of 8, by bestemor

Posted on 2012-05-12, 18:27

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Unless you're really strapped for cash, there should be no need to make one ? 😉

http://www.ebay.com/sch/i.html?_nkw=ps2+din+a … op=10&_osacat=0

Reply 4 of 8, by Great Hierophant

Posted on 2012-05-12, 19:01

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luckybob wrote:
it might be the wrong adapter, is the only thing I can think of. That or the adapter has something wrong with it. Most people dont realize there are TWO different connectors that use the big smiling lug. The original IBM XT used it and it was incompatible with later keyboards. At least thats how I remember it. Test another ps/2 keyboard with that adapter and the 486. if it still doesnt work, the adapter is the issue.

This is incorrect, the XT and AT keyboard have an identical pinout. The signals sent on those pins are not. It is possible that your adapter is broken, but I think it may be more possible that the DIN is broken. Try with a real cheapo keyboard with a true DIN.

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Reply 5 of 8, by rendo

Posted on 2012-05-12, 19:27

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I took my multimeter and checked the wiring of the adapter. There were only 2 pins of the DIN plug connected on the right way. Strange story but true. So I decided to buy another adapter with 20cm cable between the Ps2 and the Din plug so if the connection is not right I can change it. (By cutting the cable in two pieces and connect them on the right way. Thanks for your advice

Reply 6 of 8, by rendo

Posted on 2012-05-15, 19:52

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Yes the new cable works without modifying it. Now challenging some 3dfx problems.

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Reply 7 of 8, by jmrydholm

Posted on 2012-05-16, 17:35

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I have a keyboard like that, noisy as heck. I think it came off my parents' old IBM PS/2 system- I spilled Pepto Bismol once on it as as a kid. It still works, nearly 26 years later. I use it for a reliable boot time keyboard in the bios when USB goes all wonky on me.

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Reply 8 of 8, by Davros

Posted on 2012-05-16, 18:03

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Thats because it is the Keyboard of the Gods...

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