Let me preface this by saying I suspect I borked something when bolt modding this a couple years ago.
1994 Lexmark Model M. It was new old stock when I received it, but many of the rivets were broken, so I did a "partial" bolt mod, thus I didn't tear the sandwich apart. I just drilled through the holes and left the good rivets intact. My brother originally experienced these issues a year or two ago, but I couldn't reproduce it until now.
Issue Description:
Keyboard is connected via coiled SDL to PS/2 cable with active USB to PS/2 converter (the blue cube):
1. When typing a series of adjacent keys in quick succession such as "asdf", the keyboard will always drop the third letter (in this case "d"). If I keep going faster and faster, it will eventually drop the second letter and then the fourth.
2. If I perform step one and then switch to the number row, typing "1234", the 1 or the 2 will eventually continually spam the text field after I let off the keys. Unplugging the cable from the keyboard has no effect. It keeps spamming until I disconnect the cable from the computer, i.e. just the converter and the cable themselves will keep spamming with no keyboard connected.
3. When I reconnect the keyboard and cable to the computer, it automatically types "Ctrl + F" to open the search bar and then spams the Enter key, causing a continual highlight and search of the page. If I hit Enter myself, it stops this.
4. When repeating these steps with the Orihalcon SDL to USB cable, issues 1 and 3 happen, but not 2.
5. When I connect the keyboard under normal circumstance (without reproducing the other issues first), it exits whatever text field I was in, requiring me to click back into it before typing.
Any ideas of what could be causing this? Should I just rip it apart and do a full bolt mod? My best guess is that I drilled through part of the membrane, which would surprise me since the sandwich was still aligned by the other rivets.
