geekhack Projects > Making Stuff Together!
TMK IBM PC Keyboard Converter
Maledicted:
--- Quote from: hasu on Sat, 11 January 2020, 07:07:08 ---Thank you for the report!
As for Model F AT, can you try procedure below?
1. connect keyboard to converter
2. plug it into usb port
When you connect keyboard after usb plugin, the converter tries to recognize the keyboard as possible, but it requires several key strokes and the keys are ignored. You better connect keyboard before plugin to computer basically.
For Model F XT and DC-2014, the converter seems to miss signal, could you try attached firmware?
--- End quote ---
Well, with every keyboard I tested I made sure that their 5 pin din connectors were plugged into the Pro Micro before I connected the Pro Micro to the computer. I did the following with all of them:
1) Start HID_listen
2) Connect keyboard to Pro Micro
3) Connect Pro Micro to usb port on the computer
What I did with the F AT, since it was being detected as an XT keyboard for some reason when doing this, was short the reset contact to ground with a momentary button I added (while everything was still plugged in), since I figured I would need such functionality if we would be doing a lot of this.
This almost makes me want to pick up a female PS/2 adapter to wire into it as well to see what happens with random generic boards I have lying around, but I suppose they would probably work just about like the Unitek, right? I did also add a 1k resistor between data - ground and clock - ground as well, just in case (2 separate resistors). I added both of those resistors and the proper XT reset wire before I started testing your firmware.
Your alternative firmware seems to work with the DC-2014, but the XT behaved similarly to before. I would plug the Pro Micro into the computer with the keyboard already attached, no keypresses seemed to register, and HID_listen would freak out until I unplugged it. It looks like the output was a bit different this time though?
IBM Model F XT output with alternative firmware.txt (1 kB - downloaded 421 times.)
hasu:
Just note that Pull-up register is placed between 5V and signal line, not ground. 1-10K Ohm would be fine.
To confirm your converter hardware setup before testing my firmware, you can use well-tested Soarer's converter firmware.
Maledicted:
--- Quote from: hasu on Sat, 11 January 2020, 18:41:22 ---Just note that Pull-up register is placed between 5V and signal line, not ground. 1-10K Ohm would be fine.
To confirm your converter hardware setup before testing my firmware, you can use well-tested Soarer's converter firmware.
--- End quote ---
Right. 5V, not ground. My mistake. What you describe is actually how I wired it. I had previously used all of these keyboards successfully with Soarer's firmware, but I could re-test with this specific Pro Micro, and the new modifications if you like. I imagine they'll all work.
Alright, interesting results. With Soarer's converter flashed to the Pro Micro, it works with everything (including the F AT) except for the F XT, it continues to spit random things out in HID_listen. I think it might dislike the reset wire that the DC-2014 requires. I may solder an on/of switch in if I desolder the reset wire and the F XT suddenly works again with Soarer's converter.
Even with the reset wire desoldered, it is doing the same thing. Is it possible that the F XT isn't happy with a 1k ohm resistor between clock - 5v/vcc and data - 5v/vcc? I know that this keyboard worked with this very same Pro Micro without the resistors.
I think I'll throw together another basic Soarer's converter from scratch, without the resistors. I have a few more Pro Micros lying around anyway.
It just keeps getting stranger. I desoldered the resistors and resoldered the XT reset wire and the F XT did nothing. If I disconnected the XT reset wire as well, it went back to freaking out. My computer even bluescreened. I wonder what version of Soarer's firmware I originally used with this keyboard now. I'm most recently using one that somebody modified to make the Pro Micro's PB6/ contact/pin 10 into the keyboard reset line, since Soarer's firmware apparently didn't account for this on the Pro Micro.
Now the Pro Micro itself is spurting out random characters. I tried reflowing all of the solder and flashing another version of Soarer's but that didn't change anything ... I'll build a new one.
hasu:
--- Quote from: Maledicted on Sat, 11 January 2020, 18:45:12 ---
--- Quote from: hasu on Sat, 11 January 2020, 18:41:22 ---Just note that Pull-up register is placed between 5V and signal line, not ground. 1-10K Ohm would be fine.
To confirm your converter hardware setup before testing my firmware, you can use well-tested Soarer's converter firmware.
--- End quote ---
Right. 5V, not ground. My mistake. What you describe is actually how I wired it. I had previously used all of these keyboards successfully with Soarer's firmware, but I could re-test with this specific Pro Micro, and the new modifications if you like. I imagine they'll all work.
Alright, interesting results. With Soarer's converter flashed to the Pro Micro, it works with everything (including the F AT) except for the F XT, it continues to spit random things out in HID_listen. I think it might dislike the reset wire that the DC-2014 requires. I may solder an on/of switch in if I desolder the reset wire and the F XT suddenly works again with Soarer's converter.
--- End quote ---
Interesting.
There are two types of IBM XT. Type-1 requires reset line to start up while Type-2 doesn't. But on Type-2 reset line is not connected to its controller so I believe reset line doesn't bother Type-2. Converter with reset line should work regardless of whether your XT keyboard is Type-1 or Type-2.
https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-XT-Keyboard-Protocol#type-1-vs-type-2
If your XT is Type-1 and you use ProMicro you will have to use this modified version of Soarers' firmware to support reset line on pin 10(PB6). I belive you already know and use this on DC-2014, though.
https://deskthority.net/viewtopic.php?p=187874#p187874
--- Quote ---Even with the reset wire desoldered, it is doing the same thing. Is it possible that the F XT isn't happy with a 1k ohm resistor between clock - 5v/vcc and data - 5v/vcc? I know that this keyboard worked with this very same Pro Micro without the resistors.
I think I'll throw together another basic Soarer's converter from scratch, without the resistors. I have a few more Pro Micros lying around anyway.
--- End quote ---
I don't think 1K pull-up resistors are problem but it is still worth trying without them.
Thanks for your time.
Maledicted:
I redid all of the wiring on the Pro Micro with some good high quality silicone wire, cleaned up all of the old solder first with some wick. It seems to work with other keyboards again, with Soarer's firmware. I didn't know that some F XTs required the reset wire and that some did not, I figured it was weird "XT-like" boards that used it. I do know that my F XT refused to work on initial boot of my operating system unless I unplugged the converter and plugged it back in, without the reset wire. The F XT is still doing the same thing as before even with Soarer's firmware. I may take it apart and take a look inside. I got it with a cut cable, so I snipped a MIDI cable and soldered it in.
Let me know if there's anything else you want me to try with the F AT with your firmware in the mean time.
F XT cable tests good, all wires make a good connection to the controller and none are bridged. I should have known. I made sure this thing would never break. Mine must be a type-2, there are only 4 wires running from what's left of the original cable to the controller.
Alright, I built an entirely new Soarer's converter and the F XT is now working with that. I thought there may be something wrong with the other converter, but I think there was something flaky with the usb cable, grounding maybe, since once I removed the usb extender it would work. I still can't get the F AT or F XT to work with either version of your firmware though. At least the F XT doesn't spit out random keypresses though. So, I've tried 3 different usb cables and 2 different Pro Micros, one with and without the pullup resistors and a complete rewire, with the same results (once whatever was going on with the XT was resolved).
With a little more testing, I also noticed that the K151L was only working when I connected while it was in XT mode. If i switched it to AT mode, it would continue to work, but if I connected it while it was already in AT mode, it would not.
So, with the original firmware the K151L worked in XT mode. With the alternative firmware the DC-2014 worked.
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