Reddit reviews Breadboard Wires Jumper Wires Dupont Cable 120pcs Multicolored 20cm 40 pin Male to Female,Male to Male,Female to Female Breadboard Jumper Wires Ribbon Cables Kit Raspberry Pi 2 3
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Jumper Wires Kit,Michael Josh Electrical Solderless Breadboard Ribbon CablesThe Jumper Cable can be separated according to the demandCompatible with 2.54mm spacing pin headers,and to support non-standard odd-spaced headersGreat for Arduino breadboard kit projects,Portable design, easy and safe to useIn the terminals have not damaged it can be reused, if damaged can also be used for soldering
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