Reddit mentions of Teensy 2.0 with pins

its really easy,

below is an image that might be a better example.. from hasu (guy who makes TMK firmware and keyboard converters) ..the difference is in the ibm example the wires arent coming out of a coiled cable, but from a connector on the pcb within the keyboard where the cable connects to ( as seen here, the breadboard part isnt needed, it is just the method i used, his method below is much better! http://i.imgur.com/YuIYoQx.jpg )

hasu example of how easy it can be done: http://i.imgur.com/Z29rhW1.jpg

you need a teensy 2.0 with pins (suggested easiest choice), some 1K ohm resistors, and breadboard jumper cables that have female ends on both sides.

should be able to get this for for around $30

https://www.amazon.com/royfee-LYSB01LZ98KUX-ELECTRNCS-Teensy-with-Pins/dp/B01LZ98KUX/

https://www.amazon.com/Breadboard-Jumper-Wires-Aoyoho-Multicolored/dp/B01GK2Q4ZQ/

https://www.amazon.com/Watt-Carbon-Film-Resistors-pack/dp/B00EV2QC96/

now, you could probably get this junk much cheaper ordered from china on ebay..... or by avoiding a teensy and going with a different microcontroller.....

but for ease of use and not waiting 6 weeks for delivery..this is the easiest.

with this, you get the wires and the teensy..... hook it up sort of like in the picture (the pins are different locations for the ibm4704)

then you make your layout here:

http://www.tmk-kbd.com/tmk_keyboard/editor/unimap/?ibm4704_usb_alps

it spits out a hex file

and you upload it to your teensy using the software here:

https://www.pjrc.com/teensy/loader.html


no compiling needed, no 'toolchains' needed, no soldering needed.

if you want to compile firmware to get more options, you can, if you want to solder you can...... but you dont need to.

if you run into troubles reply here, or message me., ..i can help.......

also, on geekhack, hasu (and others) are really helpful

https://geekhack.org/index.php?topic=54706.0

the page below shows what pins go to which on the teensy, in the 'connector/connection' section, by taking off the cover of the big fat 'IBM' logo plastic on the end of the db9 cable (as seen here, its easy two screws: http://i.imgur.com/FmFcSQz.jpg ) you will reveal the colors of the wires, knowing the colors and location of the wires/pins youll know which pins on the teensy to connect up on the pcb connector (shown as the first image of this reply) on the keyboard:

https://github.com/tmk/tmk_keyboard/tree/master/converter/ibm4704_usb

Thanks for your comment.
I have now got a Pace RT70.


I have some decisions to make.

1. Which of the above three irons to keep.
   (I think it comes down to which can I get tips for as I am struggling with that)
   
2. I need to get some power modules, so I need to work out what temps to get.
   
3. What size tips to get. I have nothing to compare with. I will be soldering a teensy 2.0
   https://www.amazon.co.uk/gp/product/B01LZ98KUX/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
   Then I would also want a 'normal' tip. But don't know what that would be either :)
   (As in what size in mm)
   
4. What size solder would I need for the above.