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geekhack Projects => Making Stuff Together! => Topic started by: snhstq on Sun, 14 June 2015, 09:49:19

Title: IBM golfball writer and model F capacitive keyboard
Post by: snhstq on Sun, 14 June 2015, 09:49:19

Hi all,

I recently discovered that the IBM Typewriters (like type 65) contains a model F capacitive keyboard.
(http://www.ibmsystem3.nl/IBM3278/Doc&Pics/IBM_65.jpg)

This keyboard has a TTL parallel interface, needs only +5V and can easily be interfaced with an AVR chip.
After replacing the standard  keys with PS/2 keys you have a very nice little keyboard.
Just to let you all know....

(http://www.ibmsystem3.nl/IBM3278/Doc&Pics/IBM_95_a.jpg)

(p.s. the missing caps are on order :-)

(http://www.ibmsystem3.nl/IBM3278/Doc&Pics/IBM_95_b.jpg)

(http://www.ibmsystem3.nl/IBM3278/Doc&Pics/IBM_95_c.jpg)

Title: Re: IBM golfball writer and model F capacitive keyboard
Post by: fohat.digs on Sun, 14 June 2015, 10:04:06

Looks more Model M-style to me.

Too bad it doesn't have the coveted "Code" key.

Title: Re: IBM golfball writer and model F capacitive keyboard
Post by: berserkfan on Sun, 14 June 2015, 10:31:29

can't quite see any membrane that speaks of Model M. But it seems to be using barrel plate?

Title: Re: IBM golfball writer and model F capacitive keyboard
Post by: snhstq on Sun, 14 June 2015, 11:10:59

Correction: not a model F, but it is a capacitive buckling spring (not membrame) keyboard.
I converted it to a small model M style.

 

Title: Re: IBM golfball writer and model F capacitive keyboard
Post by: 0100010 on Tue, 16 June 2015, 18:35:41

Nice little board.  Looks like an xwhatsit with an adapter would work on it.

Title: Re: IBM golfball writer and model F capacitive keyboard
Post by: FrostyToast on Tue, 16 June 2015, 18:40:41

Model m style is membrane.
It's buckling spring over a membrane.
Membrane =/= rubber dome.
Membrane just refers to the two sheets with circuitrycircuitry that get pressed together by pressure from keys to complete a circuit and register a stroke.

Title: Re: IBM golfball writer and model F capacitive keyboard
Post by: JP on Tue, 05 September 2017, 09:28:55

I found a Model 85 typewriter which has a capacitive keyboard as well. The Model 65, 85, and 95 typewriters have these type of keyboards. They don't show up too often.

[attachimg=1]

[attachimg=2]

[attachimg=3]

[attachimg=4]

Title: Re: IBM golfball writer and model F capacitive keyboard
Post by: E TwentyNine on Tue, 05 September 2017, 09:45:07

Necro, but a worthy one.  Yeah those are rare beasts, and I think they all have that unique stepped big-ass-enter key.

Title: Re: IBM golfball writer and model F capacitive keyboard
Post by: 0100010 on Tue, 05 September 2017, 15:14:23

JP - could you get a pic of just the PCB?

Title: Re: IBM golfball writer and model F capacitive keyboard
Post by: JP on Fri, 08 September 2017, 20:43:55

Here ya go.

[attachimg=1]

[attachimg=2]