Televideo - The beginning of a journey. The end of my social life.

So I wasn't sure if I should post this in "marketplace" or "workshop". I guess I'll make the marketplace post at a later date when I'm in a better position to do so.

Basically I got down to the last few bits and pieces of my trip to the recycling center and I had nothing to move onto next. I decided to double down and invest everything I'd made from the recycling trip into buying about 40 of my favorite keyboard from that haul.

I dont want to say that I "fell in love" with the Televideo 965(?) keyboard, but I knew that I definitely liked it. I want to fix up and convert all these keyboards and spread the joy (by selling them).

I've already converted two of these boards in the past so I should be good on that front. My biggest concern right now is that it's going to take forever to sell all these keyboards.

Oh well, here are some pictures:

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[imghttps://i.imgur.com/rs0v3Kk.jpg][/img]

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snacksthecat
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Unread post28 Sep 2018, 02:50

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When I first read the thread title, I thought this was an autobiography. Then when I saw the first picture, my first reaction was WTF?!?. Is your wife okay with this?
xxhellfirexx

Unread post28 Sep 2018, 06:00

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What a haul. As a space invaders enthusiast, I am happy to see these all saved. I will definitely buy a few from you, especially one of the nice link ones.
Engicoder

Unread post28 Sep 2018, 13:23

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The Space Invaders have landed. Just send them to Engicoder ;) I'll probably be interested in one.
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Unread post28 Sep 2018, 13:47

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All right!! I've finally hit a point in the hobby where I'm able to represent my keyboard ownership as a bar chart! :lol:

I took some time today to organize the boards by variety.

I'll post a little profile about each different one in a little bit.

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Unread post30 Sep 2018, 20:37

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Here's some details about each of these keyboards that I could glean by taking a few apart and using some detective skills. I don't know the model numbers for these keyboards so I gave them all nicknames based on their personalities.

Below the table is a blowout of each board with what I based my assumptions on.

If you think of any other interesting factors, let me know! This is really interesting to me!

The SoldierThe PawnThe UnknownThe PatriotThe Imposter
Manufacturernmbnmbnmb(?)nmb(?)wyse
Count12 boards15 boards4 boards2 boards4 boards
Switchlinear white space invaderslinear white space invaderslinear white space invaderslinear white space invaderslinear cherry mx blacks
Variety1 eye2 small eyes2 large eyes2 small eyesvintage
Connector6p6c4p4cps26p6c4p4c
Powervoltage regulatorlabeled 5vlabeled 5vvoltage regulatorpresume 5v
Protocol (guess)something over serialsomething over serialat/xtsomething over serialwyse


The Soldier
Image
Spoiler:
manufacturer: nmb
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count: 12 boards
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switch: linear white space invaders
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variety: 1 eye
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connector: 6p6c
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power: voltage regulator
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protocol: something over serial (just assuming based on the connector)
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The Pawn
Image
Spoiler:
manufacturer: nmb
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count: 15 boards
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switch: linear white space invaders
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variety: 2 small eyes
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connector: 4p4c
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power: labeled 5v
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protocol: something over serial
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The Unknown
Image
Spoiler:
manufacturer: nmb
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count: 4 boards
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switch: linear white space invaders
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variety: 2 large eyes
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connector: ps2
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power: labeled 5v
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protocol: at/xt
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The Patriot
Image
Spoiler:
manufacturer: nmb
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count: 2 boards
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switch: linear white space invaders
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variety: 2 small eyes
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connector: 6p6c
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power: voltage regulator
Image

protocol: something over serial (based on connector)
Image


The Imposter
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Spoiler:
manufacturer: wyse
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count: 4 boards
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switch: linear cherry mx blacks
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variety: vintage
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connector: 4p4c
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power: presume 5v (based on absence of voltage regulator)
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protocol: wyse
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Thanks for reading!!!! :lol:
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Unread post30 Sep 2018, 22:42

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That’s a funky layout!
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Unread post30 Sep 2018, 23:30

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Outstanding! Good luck saving more great boards from scrap!
abrahamstechnology

Unread post01 Oct 2018, 00:51

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Man, the Soldier (Televideo 725) sure does require a lot of pins.

I'd like to take this information, do a little rewiring, and see if I can get this to work with a straight forward teensy++ 2.0 drop in place of the main IC. That would keep the internals nice and neat.

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Unread post04 Oct 2018, 00:57

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I'd like to think I'm getting pretty good at this and I'm really happy with how these are starting to turn out!

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Unread post10 Oct 2018, 00:13

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Holy crap that's a clean conversion, the Teensy fits in there perfectly.
snot
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Unread post10 Oct 2018, 01:18

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I would like to see how. Straight before and afters are just a tease! (Especially when they’re different boards.)
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Unread post10 Oct 2018, 07:14

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Nice job snacks! Looks great. Definitely interested in buying a patriot and imposter if you decide to sell a few.
I have been working on a teensy like variant that matches the MCS-48 (8048,8049, etc) pinout better than the Teensy++ and has a few options for providing power to the board for other functions. I will make a post about it later today.
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Unread post10 Oct 2018, 11:26

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Nice! It is great how the Teensy fits the IC socket on these boards|
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Unread post10 Oct 2018, 15:29

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If you ever need a buyer and the price is right.. I'm right here, waiting!
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Unread post13 Oct 2018, 19:24

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Thank you guys for the nice messages!

I'm doing another one today and I'll make a detailed post with photos/videos of the whole process so that it's not just a "before and after" thread :)

@snufflecat, feel free to PM me and I can do one for you. I'll send you the keymap I've been using and you can let me know what to change to tailor it to you.
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Unread post13 Oct 2018, 21:14

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Dear lord, this has taken me all day to put together. Hope someone finds this interesting :)

Before:
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Step 1: Map out PCB
Using a multimeter set to continuity check mode to check which pins correspond to the rows and columns. I mark the pins with a permanent marker.

Image

Step 2: Remove keycaps
Space invaders can be a little bit tricky to remove the caps. I use a sideways prying motion to pop them off.


Step 3: Remove unnecessary components
Removed all of the unnecessary passive components like resistors which can pull the signal down and give weird key presses.


Step 4: Desolder ICs
Since we're replacing the controller, these aren't needed any longer


Step 5: Dust the life out of it
This thing is awesome. So much better than canned air and it's paid for itself several times over


Step 6: Clean the keycaps
Image
First I soak them with dish soap then run them through an ultrasonic jewelry cleaner a few times.


Step 7: Clean the case
Image
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I use a mr clean magic eraser which gets off all of the marks with minimal elbow grease



Step 8: Solder pins onto teensy
I use a breadboard to keep things in place while I solder the pins.

Image

Step 9: Solder teensy to board
Thought about socketing it but my pins were a bit too fat to fit.


Step 10: Replace keycaps
Luckily I have lots of boards to use as a reference.


Step 11: Test matrix
Just making sure everything was traced out correctly.


Step 12: Map matrix
I have a little arduino sketch I wrote which prints the row and column for each key. Makes this job a lot easier


Step 13: Program TMK
I love TMK! Looks tricky but it's fairly straight forward once you've done it a couple times.


Step 14: LED
Forgot about the LED so I had to do it after the fact.


Step 15: Compile and flash
Fingers crossed.... IT COMPILES!!!!!


After:
Image
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Unread post14 Oct 2018, 07:11

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Thanks indeed! Just glancing here on my phone, I can see the work you put into it. Should be gold!
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Unread post14 Oct 2018, 16:27

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Love mine already :)
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Unread post14 Oct 2018, 17:48

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Great write up Snacks!! Very thorough. It's great to see space invaders get some love. That is a fantastic looking board!
Engicoder

Unread post14 Oct 2018, 23:08

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Wow thanks again guys!

Someone on reddit was asking how they compare weight wise, which I thought was an interesting question. Here's how they each size up:

The Patriot - 43.43oz
Image

The Unknown - 48.57oz
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The Pawn - 49.03oz
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The Imposter - 52.45oz
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The Soldier - 53.8 oz
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A couple people were also wondering what switch the linear space invaders are most comparable to. In my opinion, they're very similar to vintage mx blacks, but a tiny tiny bit lighter. The biggest difference I observe is in the sound. The space invaders make a deeper, "thockier" sound than the vintage cherries:

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Unread postYesterday, 00:37

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Outstanding! That soldering is really nice and smooth.
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