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geekhack Projects => Making Stuff Together! => Topic started by: CommunistWitchDr on Fri, 24 May 2013, 17:10:47

Title: Old WYSE Teensy
Post by: CommunistWitchDr on Fri, 24 May 2013, 17:10:47

(http://i.imgur.com/zqlgbiq.jpg)

So I got a WYSE Terminal board for three bucks. The caps and switches alone are worth more than that, but I'd rather teensy mod the whole board.
I got it apart and desoldered the controller, but frankly don't know where to go from here.

(http://i.imgur.com/A2WOEs3.jpg)
(http://i.imgur.com/lC3c7ma.jpg)


Other's WYSE teensy mods
http://imgur.com/a/rBTpp

http://deskthority.net/workshop-f7/wyse-terminal-board-mod-t646.html

Title: Re: Old WYSE Teensy
Post by: Soarer on Fri, 24 May 2013, 18:11:06

Shame you don't have the exact same model, or it would be easy! Yours might use the same matrix layout, but you'd need to verify it.

The process for working out the connections and matrix is basically the same for any keyboard... lots of testing with a multimeter or continuity tester! You should be able to find some posts about that around the place, but here's a couple of recent ones...
http://geekhack.org/index.php?topic=17458.msg870218#msg870218
http://deskthority.net/workshop-f7/filco-minila-swap-alt-and-win-key-teensy-my-best-bet-t5751.html

The main thing is just to work out which lines are strobes (outputs from the controller) and which are senses (inputs)... the rest can be handled in the software.

Title: Re: Old WYSE Teensy
Post by: CommunistWitchDr on Sat, 25 May 2013, 10:06:18

While it isn't the same model, it had the same controller chip as the imgur link one.

Title: Re: Old WYSE Teensy
Post by: Soarer on Sat, 25 May 2013, 10:57:25

The one on DT could have been the same also, with 28 pins. You'd still need to test the connections to verify the pinout though... and find any 'extras' like the pin '29' that's not on the chip.

Title: Re: Old WYSE Teensy
Post by: SmallFry on Sat, 25 May 2013, 11:41:01

The model appears to be a WYSE PCE.

Title: Re: Old WYSE Teensy
Post by: Soarer on Sat, 25 May 2013, 13:30:31

Quote from: SmallFry on Sat, 25 May 2013, 11:41:01

The model appears to be a WYSE PCE.

Dunno... I just looked inside a couple of PCE and they have 3 diodes next to the controller chip, rather than 2. Very similar component layout otherwise though.

Title: Re: Old WYSE Teensy
Post by: Soarer on Sat, 30 November 2013, 10:16:49

Yup, it's a PCE alright, just the ANSI version whereas I have the ISO.

Still want to get this working?

I've been collating info (http://geekhack.org/index.php?topic=51079.0), and your pic of the PCB helped :D

Title: Re: Old WYSE Teensy
Post by: metalliqaz on Sat, 30 November 2013, 10:20:31

I also have an ANSI PCE that I want to get working with a Teensy.  If you need any info about it at all Soarer, just ask!

Title: Re: Old WYSE Teensy
Post by: Soarer on Sat, 30 November 2013, 10:41:43

I could do with confirmation that the track headed left from pin 21 in that PCB pic doesn't go to another diode, but it's unlikely (can't see another diode at all in the component side pic, but it doesn't show right to the edge of the PCB).

Mostly, I reckon I'm ready to start writing a protype converter  - can always iron out bugs later :))