Logs, 10 tries each of Space + C simultaneously:
EasyAVR via Metalliqaz:
42:53.0182 C (0x43, BIOS 0x2E) DOWN
42:53.0183 Space (0x20, BIOS 0x39) DOWN
42:53.0276 C (0x43, BIOS 0x2E) UP -> 94ms
42:53.0278 Space (0x20, BIOS 0x39) UP -> 95ms
42:53.0700 C (0x43, BIOS 0x2E) DOWN
42:53.0701 Space (0x20, BIOS 0x39) DOWN
42:53.0809 C (0x43, BIOS 0x2E) UP -> 109ms
42:53.0811 Space (0x20, BIOS 0x39) UP -> 110ms
42:54.0136 C (0x43, BIOS 0x2E) DOWN
42:54.0137 Space (0x20, BIOS 0x39) DOWN
42:54.0229 C (0x43, BIOS 0x2E) UP -> 92ms
42:54.0247 Space (0x20, BIOS 0x39) UP -> 109ms
42:54.0552 C (0x43, BIOS 0x2E) DOWN
42:54.0553 Space (0x20, BIOS 0x39) DOWN
42:54.0632 C (0x43, BIOS 0x2E) UP -> 80ms
42:54.0656 Space (0x20, BIOS 0x39) UP -> 103ms
42:55.0037 C (0x43, BIOS 0x2E) DOWN
42:55.0040 Space (0x20, BIOS 0x39) DOWN
42:55.0124 C (0x43, BIOS 0x2E) UP -> 87ms
42:55.0128 Space (0x20, BIOS 0x39) UP -> 88ms
42:55.0561 C (0x43, BIOS 0x2E) DOWN
42:55.0562 Space (0x20, BIOS 0x39) DOWN
42:55.0626 C (0x43, BIOS 0x2E) UP -> 66ms
42:55.0628 Space (0x20, BIOS 0x39) UP -> 67ms
42:55.0979 C (0x43, BIOS 0x2E) DOWN
42:55.0980 Space (0x20, BIOS 0x39) DOWN
42:56.0050 C (0x43, BIOS 0x2E) UP -> 71ms
42:56.0053 Space (0x20, BIOS 0x39) UP -> 72ms
42:56.0536 C (0x43, BIOS 0x2E) DOWN
42:56.0537 Space (0x20, BIOS 0x39) DOWN
42:56.0600 C (0x43, BIOS 0x2E) UP -> 64ms
42:56.0601 Space (0x20, BIOS 0x39) UP -> 64ms
42:57.0026 C (0x43, BIOS 0x2E) DOWN
42:57.0028 Space (0x20, BIOS 0x39) DOWN
42:57.0099 C (0x43, BIOS 0x2E) UP -> 73ms
42:57.0100 Space (0x20, BIOS 0x39) UP -> 72ms
42:57.0469 C (0x43, BIOS 0x2E) DOWN
42:57.0471 Space (0x20, BIOS 0x39) DOWN
42:57.0540 C (0x43, BIOS 0x2E) UP -> 72ms
42:57.0542 Space (0x20, BIOS 0x39) UP -> 72ms
TMK 6KRO
50:42.0321 C (0x43, BIOS 0x2E) DOWN
50:42.0328 Space (0x20, BIOS 0x39) DOWN
50:42.0416 C (0x43, BIOS 0x2E) UP -> 96ms
50:42.0424 Space (0x20, BIOS 0x39) UP -> 96ms
50:42.0744 C (0x43, BIOS 0x2E) DOWN
50:42.0752 Space (0x20, BIOS 0x39) DOWN
50:42.0833 C (0x43, BIOS 0x2E) UP -> 88ms
50:42.0841 Space (0x20, BIOS 0x39) UP -> 88ms
50:43.0209 C (0x43, BIOS 0x2E) DOWN
50:43.0217 Space (0x20, BIOS 0x39) DOWN
50:43.0289 C (0x43, BIOS 0x2E) UP -> 80ms
50:43.0297 Space (0x20, BIOS 0x39) UP -> 80ms
50:43.0633 C (0x43, BIOS 0x2E) DOWN
50:43.0641 Space (0x20, BIOS 0x39) DOWN
50:43.0745 C (0x43, BIOS 0x2E) UP -> 112ms
50:43.0761 Space (0x20, BIOS 0x39) UP -> 120ms
50:44.0121 C (0x43, BIOS 0x2E) DOWN
50:44.0129 Space (0x20, BIOS 0x39) DOWN
50:44.0193 C (0x43, BIOS 0x2E) UP -> 72ms
50:44.0208 Space (0x20, BIOS 0x39) UP -> 80ms
50:44.0560 C (0x43, BIOS 0x2E) DOWN
50:44.0568 Space (0x20, BIOS 0x39) DOWN
50:44.0632 C (0x43, BIOS 0x2E) UP -> 72ms
50:44.0640 Space (0x20, BIOS 0x39) UP -> 72ms
50:44.0976 C (0x43, BIOS 0x2E) DOWN
50:44.0985 Space (0x20, BIOS 0x39) DOWN
50:45.0056 C (0x43, BIOS 0x2E) UP -> 80ms
50:45.0065 Space (0x20, BIOS 0x39) UP -> 80ms
50:45.0416 C (0x43, BIOS 0x2E) DOWN
50:45.0424 Space (0x20, BIOS 0x39) DOWN
50:45.0481 C (0x43, BIOS 0x2E) UP -> 64ms
50:45.0505 Space (0x20, BIOS 0x39) UP -> 80ms
50:45.0889 C (0x43, BIOS 0x2E) DOWN
50:45.0897 Space (0x20, BIOS 0x39) DOWN
50:45.0969 C (0x43, BIOS 0x2E) UP -> 80ms
50:45.0977 Space (0x20, BIOS 0x39) UP -> 80ms
50:46.0305 C (0x43, BIOS 0x2E) DOWN
50:46.0313 Space (0x20, BIOS 0x39) DOWN
50:46.0393 C (0x43, BIOS 0x2E) UP -> 88ms
50:46.0401 Space (0x20, BIOS 0x39) UP -> 88ms
TMK NKRO
51:55.0322 C (0x43, BIOS 0x2E) DOWN
51:55.0323 Space (0x20, BIOS 0x39) DOWN
51:55.0419 C (0x43, BIOS 0x2E) UP -> 98ms
51:55.0420 Space (0x20, BIOS 0x39) UP -> 98ms
51:55.0865 C (0x43, BIOS 0x2E) DOWN
51:55.0866 Space (0x20, BIOS 0x39) DOWN
51:55.0974 C (0x43, BIOS 0x2E) UP -> 109ms
51:55.0974 Space (0x20, BIOS 0x39) UP -> 109ms
51:56.0806 C (0x43, BIOS 0x2E) DOWN
51:56.0807 Space (0x20, BIOS 0x39) DOWN
51:56.0912 C (0x43, BIOS 0x2E) UP -> 106ms
51:56.0912 Space (0x20, BIOS 0x39) UP -> 106ms
51:57.0328 C (0x43, BIOS 0x2E) DOWN
51:57.0329 Space (0x20, BIOS 0x39) DOWN
51:57.0425 C (0x43, BIOS 0x2E) UP -> 97ms
51:57.0426 Space (0x20, BIOS 0x39) UP -> 97ms
51:58.0030 C (0x43, BIOS 0x2E) DOWN
51:58.0030 Space (0x20, BIOS 0x39) DOWN
51:58.0120 C (0x43, BIOS 0x2E) UP -> 91ms
51:58.0121 Space (0x20, BIOS 0x39) UP -> 91ms
51:58.0773 C (0x43, BIOS 0x2E) DOWN
51:58.0773 Space (0x20, BIOS 0x39) DOWN
51:58.0858 C (0x43, BIOS 0x2E) UP -> 86ms
51:58.0866 Space (0x20, BIOS 0x39) UP -> 93ms
51:59.0312 C (0x43, BIOS 0x2E) DOWN
51:59.0313 Space (0x20, BIOS 0x39) DOWN
51:59.0399 C (0x43, BIOS 0x2E) UP -> 86ms
51:59.0407 Space (0x20, BIOS 0x39) UP -> 93ms
51:59.0888 C (0x43, BIOS 0x2E) DOWN
51:59.0888 Space (0x20, BIOS 0x39) DOWN
51:59.0986 C (0x43, BIOS 0x2E) UP -> 98ms
51:59.0996 Space (0x20, BIOS 0x39) UP -> 108ms
52:00.0571 C (0x43, BIOS 0x2E) DOWN
52:00.0572 Space (0x20, BIOS 0x39) DOWN
52:00.0660 C (0x43, BIOS 0x2E) UP -> 90ms
52:00.0667 Space (0x20, BIOS 0x39) UP -> 96ms
52:01.0167 C (0x43, BIOS 0x2E) DOWN
52:01.0168 Space (0x20, BIOS 0x39) DOWN
52:01.0252 C (0x43, BIOS 0x2E) UP -> 84ms
52:01.0253 Space (0x20, BIOS 0x39) UP -> 84ms
b.face
58:11.0027 C (0x43, BIOS 0x2E) DOWN
58:11.0028 Space (0x20, BIOS 0x39) DOWN
58:11.0135 C (0x43, BIOS 0x2E) UP -> 128ms
58:11.0136 Space (0x20, BIOS 0x39) UP -> 108ms
58:11.0616 C (0x43, BIOS 0x2E) DOWN
58:11.0617 Space (0x20, BIOS 0x39) DOWN
58:11.0712 C (0x43, BIOS 0x2E) UP -> 96ms
58:11.0720 Space (0x20, BIOS 0x39) UP -> 103ms
58:12.0104 C (0x43, BIOS 0x2E) DOWN
58:12.0105 Space (0x20, BIOS 0x39) DOWN
58:12.0200 C (0x43, BIOS 0x2E) UP -> 96ms
58:12.0201 Space (0x20, BIOS 0x39) UP -> 96ms
58:12.0639 C (0x43, BIOS 0x2E) DOWN
58:12.0640 Space (0x20, BIOS 0x39) DOWN
58:12.0720 C (0x43, BIOS 0x2E) UP -> 80ms
58:12.0721 Space (0x20, BIOS 0x39) UP -> 80ms
58:13.0096 C (0x43, BIOS 0x2E) DOWN
58:13.0097 Space (0x20, BIOS 0x39) DOWN
58:13.0176 C (0x43, BIOS 0x2E) UP -> 80ms
58:13.0184 Space (0x20, BIOS 0x39) UP -> 87ms
58:13.0560 C (0x43, BIOS 0x2E) DOWN
58:13.0561 Space (0x20, BIOS 0x39) DOWN
58:13.0648 C (0x43, BIOS 0x2E) UP -> 88ms
58:13.0648 Space (0x20, BIOS 0x39) UP -> 88ms
58:14.0919 C (0x43, BIOS 0x2E) DOWN
58:14.0920 Space (0x20, BIOS 0x39) DOWN
58:15.0024 C (0x43, BIOS 0x2E) UP -> 104ms
58:15.0025 Space (0x20, BIOS 0x39) UP -> 104ms
58:15.0360 Space (0x20, BIOS 0x39) DOWN
58:15.0368 C (0x43, BIOS 0x2E) DOWN
58:15.0432 C (0x43, BIOS 0x2E) UP -> 64ms
58:15.0448 Space (0x20, BIOS 0x39) UP -> 88ms
58:15.0872 C (0x43, BIOS 0x2E) DOWN
58:15.0873 Space (0x20, BIOS 0x39) DOWN
58:15.0943 C (0x43, BIOS 0x2E) UP -> 72ms
58:15.0951 Space (0x20, BIOS 0x39) UP -> 79ms
58:16.0256 C (0x43, BIOS 0x2E) DOWN
58:16.0256 Space (0x20, BIOS 0x39) DOWN
58:16.0319 C (0x43, BIOS 0x2E) UP -> 64ms
58:16.0327 Space (0x20, BIOS 0x39) UP -> 71ms
I also confirmed in game, only TMK 6KRO does not work.
Interestingly, the b.face is 6KRO.