The PS/2 controller code for Unicomp's current generation PS/2 keyboard sends the wrong scancodes when Ctrl + Pause (which should be Break) is pressed:
... representing a press of Scroll Lock, which is Break because Ctrl is being pressed, it instead sends...
E0 77
... representing a press of Num Lock, which is just the old way of getting Pause.
Since the E0 77 coming from the controller is not a normal sequence, this workaround does not interfere with Ctrl + Num Lock, which still Pauses as it should. It uses the same solution as the existing override to produce Break (for keyboards with more sensible controllers in them).
tmk
commented
1 year ago
The PS/2 controller code for Unicomp's current generation PS/2 keyboard sends the wrong scancodes when Ctrl + Pause (which should be Break) is pressed:
https://deskthority.net/viewtopic.php?f=2&t=25718 https://www.reddit.com/r/modelm/comments/n0u81o/anybody_out_there_rocking_a_ps2_unicomp_noticed/
Instead of it sending the Break sequence...
... representing a press of Scroll Lock, which is Break because Ctrl is being pressed, it instead sends...
... representing a press of Num Lock, which is just the old way of getting Pause.
Since the E0 77 coming from the controller is not a normal sequence, this workaround does not interfere with Ctrl + Num Lock, which still Pauses as it should. It uses the same solution as the existing override to produce Break (for keyboards with more sensible controllers in them).