Author Topic: Atari CX85 Numpad (USB modified  (Read 3404 times)

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Offline jalli

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Atari CX85 Numpad (USB modified
« on: Thu, 21 November 2013, 22:45:07 »
Figured I'd post this hack.

Found an old Atari CX85 on Ebay for $18, splurged on a Teensy 2 and wired it all up.

Layout/Firmware can be found on https://github.com/jalli/tmk_keyboard/tree/master/keyboard/cx85

45380-0

Antonia

Offline nubbinator

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Re: Atari CX85 Numpad (USB modified
« Reply #1 on: Thu, 21 November 2013, 22:55:38 »
What kind of switches does it have?  And how long did it take you to figure out all the code for it?

That's such a cool little project.  I actually really love the layout of that.  The 3x +/Enter is a little wonky and it's sad it's missing the other parts of a numpad, but that's a pretty awesome little retro box and a cool little project. 

Offline kaltar

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Re: Atari CX85 Numpad (USB modified
« Reply #2 on: Thu, 21 November 2013, 23:43:26 »
Love it!!! So damn cool!!!

Offline sth

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Re: Atari CX85 Numpad (USB modified
« Reply #3 on: Thu, 21 November 2013, 23:57:59 »
What kind of switches does it have?  And how long did it take you to figure out all the code for it?

That's such a cool little project.  I actually really love the layout of that.  The 3x +/Enter is a little wonky and it's sad it's missing the other parts of a numpad, but that's a pretty awesome little retro box and a cool little project. 


http://deskthority.net/wiki/Stackpole_switch_grid
« Last Edit: Fri, 22 November 2013, 00:01:02 by sth »
11:48 -!- SmallFry [~SmallFry@unaffiliated/smallfry] has quit [Ping timeout: 245 seconds] ... rest in peace

Offline jalli

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Re: Atari CX85 Numpad (USB modified
« Reply #4 on: Fri, 22 November 2013, 08:22:49 »
What kind of switches does it have?  And how long did it take you to figure out all the code for it?

That's such a cool little project.  I actually really love the layout of that.  The 3x +/Enter is a little wonky and it's sad it's missing the other parts of a numpad, but that's a pretty awesome little retro box and a cool little project.

There are some great shots of the PCB and switches in here:
http://atariage.com/forums/topic/155452-hacking-the-atari-800-keyboard-cx85-keypad-onto-a-usb-pc-keyboard-circuit/

The Caps have the same cross as the Cherry MX but the stems are a bit wider so they would not fit an MX switch without shaving the outside. On the plus side any Cherry MX Caps will fit the CX85.

It took about a day to figure out all the wiring and the grid, soldered the PCB end and then used a breadboard to test everything out before soldering permanently.

It's a nifty little box, I've been thinking about transplanting some caps from my Televideo set: http://geekhack.org/index.php?topic=49503.msg1071064#msg1071064 since they are compatible.


Antonia

Offline Lostwave

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Re: Atari CX85 Numpad (USB modified
« Reply #5 on: Mon, 12 January 2015, 10:45:27 »
I know this thread is old.  But I have one of these and am thinking about doing this.

Just a couple of questions, looking at the code, it looks like you skipped all of the CX-85s controller.  Did you wire the Teensy directly to the buttons on the CX85?

I was kind of hoping to do it without destroying the board, i.e. hooking to the board the same way the atari db9 plug did.

Any help would be appreciated.

Thanks
Natural Keyboard Pro ~ Ducky Shine3 ~ IBM M 122 ~ IBM F ~ KBC Poker 2 ~ Atari CX-85 ~ Touchstone 2

Offline jalli

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Re: Atari CX85 Numpad (USB modified
« Reply #6 on: Mon, 12 January 2015, 15:52:42 »
Hey,

I actually skipped the controller entirely, it's been a while but if you have any specific questions I can probably take the box off and check.
Antonia

Offline Lostwave

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Re: Atari CX85 Numpad (USB modified
« Reply #7 on: Wed, 04 February 2015, 15:59:49 »
A while ago I picked one of these on ebay for $25, its New Old Stock, never been used.  They have more if anyone is interested. 
http://www.ebay.com/itm/CX-85-Atari-Numeric-Keypad-New-NOS-White-Box-800-XL-XE-/140954304589?pt=LH_DefaultDomain_0&hash=item20d188004d

I managed to make this work without hacking it at all, I can put it back to stock by unplugging the teensy from the mainboard, and hooking the stock atari cord back up. 

The hardest part was to allow it to use media keys, thats way more complex than it needs to be.

Just wired a teensy to the mainboard and wrote my first teensy program.  Amazingly it worked.

Source code here: https://github.com/Lostwave/cx85
Natural Keyboard Pro ~ Ducky Shine3 ~ IBM M 122 ~ IBM F ~ KBC Poker 2 ~ Atari CX-85 ~ Touchstone 2

Offline TheSoulhunter

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Re: Atari CX85 Numpad (USB modified
« Reply #8 on: Fri, 06 March 2015, 18:16:01 »
Awesome! Like that "longcat" enter XD