Author Topic: Several questions about the 122 Key Model M  (Read 2144 times)

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Offline ibell7945

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Several questions about the 122 Key Model M
« on: Tue, 07 January 2014, 07:55:34 »
Now that I've made the plunge into mechanical keyboards by purchasing a Model M (part number 1394100, 122 key with RJ-45 terminal connector). Though I've read Soarer's thread and ordered a teensy, I'm currently attempting to disassemble the keyboard for a more thorough cleaning. On the back, I attempted to take the three bolts/screws off, but found they seemed to be a nonstandard size. Does anyone know the size of these screws? Also, will modern Unicomp replacement keycaps work with this board?

IBM 122 Key Model M

Offline Aer Fixus

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Re: Several questions about the 122 Key Model M
« Reply #1 on: Tue, 07 January 2014, 09:28:43 »
Same size as a Model M.

5.5mm or 7/32' bolt driver.

And, yes. Unicomp caps will fit. Most buckling spring caps will work on your board, so you can swap with a Model M or a Model F if you wish. The exception is the Model M2 and some other obscure boards.
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I lie all the time.... I really don't even like keyboards

Offline ibell7945

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Re: Several questions about the 122 Key Model M
« Reply #2 on: Tue, 07 January 2014, 09:38:00 »
Thanks for the bolt size, as I'm going to the hardware store today to pickup a driver. However, another question occurred to me. Considering this is a terminal keyboard, will the mods that work with this model be more similar to the mods that work with the Model F terminal keyboard or other Model M keyboards?   

IBM 122 Key Model M

Offline fohat.digs

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Re: Several questions about the 122 Key Model M
« Reply #3 on: Tue, 07 January 2014, 10:16:05 »
The hardware store is not likely to have the "long" or "thin-walled" 7/32" socket you need (5.5mm will substitute well) so you might try an auto parts store. Here is a good cheap item if you are willing to wait a few days, I bought one:

http://www.ebay.com/itm/Allen-30803-SAE-Nutdriver-Soild-Shaft-7-32-USA-/390441743902?pt=US_Srewdrivers_Nut_Drivers&hash=item5ae824361e

Otherwise the mechanical work is the same as any other Model M and Soarer's Converter with Teensy will work just fine.

Here are the bolts you need, and you won't find them at the hardware store, either. The self-tappers at the bottom are unnecessary.

"However, even though I was born in the Mesozoic, I do know what anyone who wants to reach out to young people should say: Billionaires took your money. They took your chance to buy a home. They took your chance at a good education. They stole your opportunities. Billionaires took the things you want in life. If you really want those things, you have to take them back.
That's the message. That's the whole message. Say that every day, not just to reach America's frustrated young white men, but people of every age, race, and gender.
Late-stage capitalism is a wealth-concentration engine, focused on vacuuming up every dollar and putting it in as few hands as possible. Republicans are helping that vacuum suck.
How does a tiny fraction of the population get away with this? They do it by dividing the other 99% of Americans against themselves."
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Offline fohat.digs

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Re: Several questions about the 122 Key Model M
« Reply #4 on: Tue, 07 January 2014, 10:17:17 »
double post, sorry
"However, even though I was born in the Mesozoic, I do know what anyone who wants to reach out to young people should say: Billionaires took your money. They took your chance to buy a home. They took your chance at a good education. They stole your opportunities. Billionaires took the things you want in life. If you really want those things, you have to take them back.
That's the message. That's the whole message. Say that every day, not just to reach America's frustrated young white men, but people of every age, race, and gender.
Late-stage capitalism is a wealth-concentration engine, focused on vacuuming up every dollar and putting it in as few hands as possible. Republicans are helping that vacuum suck.
How does a tiny fraction of the population get away with this? They do it by dividing the other 99% of Americans against themselves."
- Marc Sumner 2025-05-30

Offline ibell7945

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Re: Several questions about the 122 Key Model M
« Reply #5 on: Tue, 07 January 2014, 12:15:47 »
The hardware store is not likely to have the "long" or "thin-walled" 7/32" socket you need (5.5mm will substitute well) so you might try an auto parts store. Here is a good cheap item if you are willing to wait a few days, I bought one:

http://www.ebay.com/itm/Allen-30803-SAE-Nutdriver-Soild-Shaft-7-32-USA-/390441743902?pt=US_Srewdrivers_Nut_Drivers&hash=item5ae824361e

Otherwise the mechanical work is the same as any other Model M and Soarer's Converter with Teensy will work just fine.

Here are the bolts you need, and you won't find them at the hardware store, either. The self-tappers at the bottom are unnecessary.



Thanks for the recommendations and links. On an unrelated note, I originally wanted one of these keyboards because I saw your posts on modifying them.

IBM 122 Key Model M

Offline terrpn

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Re: Several questions about the 122 Key Model M
« Reply #6 on: Tue, 07 January 2014, 12:43:56 »
i got my deep, thin walled 7/32 socket at lowe's if i am not mistaken for what its worth
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Offline berserkfan

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Re: Several questions about the 122 Key Model M
« Reply #7 on: Wed, 08 January 2014, 05:41:32 »
All you really need, apart from the nut driver, is a teensy with pins and some dupont connector cables.

you can always remove the obsolete telephone style cable and put in the dupont connector cables which you connect to your teensy. that way you don't need to build a female adapter for the telephone cable.



Thanks for the bolt size, as I'm going to the hardware store today to pickup a driver. However, another question occurred to me. Considering this is a terminal keyboard, will the mods that work with this model be more similar to the mods that work with the Model F terminal keyboard or other Model M keyboards?
Most of the modding can be done on your own once you break through the psychological barriers.