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geekhack Community => Keyboards => Topic started by: TheSven on Sat, 24 January 2015, 08:31:30

Title: IBM Model M2 key rollover?
Post by: TheSven on Sat, 24 January 2015, 08:31:30: I've got a broken Model M2 (bad caps), and I wanted to know what the key rollover is for it. Is it 2 like the regular Model M, or higher?
Thanks.
Title: Re: IBM Model M2 key rollover?
Post by: 0100010 on Sat, 24 January 2015, 12:45:44: 2KRO
Title: Re: IBM Model M2 key rollover?
Post by: Findecanor on Sat, 24 January 2015, 17:03:32: The M2 has buckling spring over membrane, just like the Model M. The springs/hammers are identical but the barrels are shorter, with shorter keycaps and the keys are all in one plane, not mounted on a curved backplate.
Title: Re: IBM Model M2 key rollover?
Post by: TheSven on Sun, 25 January 2015, 08:32:56: Quote from: 0100010 on Sat, 24 January 2015, 12:45:44
2KRO
Aww that's a shame. I heard there's a mod to put some kind of copper sheet in the KB to make it NKRO? Are the Unicomps 2KRO as well?
Title: Re: IBM Model M2 key rollover?
Post by: 0100010 on Sun, 25 January 2015, 08:50:54: Yes, Unicomps are 2KRO as well.

If you want NKRO in buckling spring, you need to go Model F.
Title: Re: IBM Model M2 key rollover?
Post by: TheSven on Sun, 25 January 2015, 10:40:50: Quote from: 0100010 on Sun, 25 January 2015, 08:50:54
Yes, Unicomps are 2KRO as well.

If you want NKRO in buckling spring, you need to go Model F.
What about this mod then, how do I perform that?
Title: Re: IBM Model M2 key rollover?
Post by: 0100010 on Sun, 25 January 2015, 15:09:41: (It helps if you give a timestamp of when in the video they are discussing what you are referring to, especially when the video is an hour long.) There is a thread for this, but I was not aware anyone had completed the work. Will find and post.
Title: Re: IBM Model M2 key rollover?
Post by: 0100010 on Sun, 25 January 2015, 15:19:20: This thread has some work on a custom Model M membrane that could incorporate diodes to allow for NKRO, around reply 87 or so.

https://geekhack.org/index.php?topic=40111.60
Title: Re: IBM Model M2 key rollover?
Post by: TheSven on Mon, 26 January 2015, 02:20:19: Quote from: 0100010 on Sun, 25 January 2015, 15:09:41
(It helps if you give a timestamp of when in the video they are discussing what you are referring to, especially when the video is an hour long.) There is a thread for this, but I was not aware anyone had completed the work. Will find and post.
It was supposed to be around 44:00 I think, the link worked for me and started at that time.