So with this in mind I found another user that had a bit of an issue with an NCR 4950. And after some comparison I noticed that this is the same board as the ADDS ASCII and that they were just rebadge. Link to that thread below:
Next was to get all off the caps and have a look at the state of the plate..... And that is where all of the work really began. Below is some of pictures of the controller, PCB and rust damage.
Controller and switchable protocols:
I got the PCB a bit cleaner with isopropyl alcohol and a paper towel. Next is to take the plate and remove the rust with a long bath in vinegar. After I painted the plate with Rustoleum and put a matte clear coat for the last 2 layers. After I resoldered all of the switches and started pulling out the sliders to be lubed.(Video of how to do this will be linked later)
Painted plate and opened switches:
I just used Soarer's converter for the hex file on the teensy. Some of the key are a bit weird and might need to be remapped and will be doing that in the future. Otherwise it works fine and this is the hardware pinout for the converter.
6 = reset - red
5 = data - green
4 = case gnd - black shielded
3 = clock - yellow
2 = sg gnd - black shielded
1 = vcc +5v - white
Top is the original cable and the bottom is the teensy cables:
Thanks for having a look!