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Unicomp New Model M broken Pause/Break key fix

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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.

Instead of it sending the Break sequence...

    E0 7E E0 F0 7E

... 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.
This commit is contained in:
an_achronism 2023-03-01 02:19:11 +00:00
parent 162674035d
commit 876ee194bc
1 changed files with 1 additions and 0 deletions
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converter/ibmpc_usb/ibmpc_usb.cpp
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@ -914,6 +914,7 @@ uint8_t IBMPCConverter::cs2_e0code(uint8_t code) {
case 0x72: return 0x3F; // cursor down case 0x72: return 0x3F; // cursor down
case 0x74: return 0x47; // cursor right case 0x74: return 0x47; // cursor right
case 0x75: return 0x4F; // cursor up case 0x75: return 0x4F; // cursor up
case 0x77: return 0x00; // Unicomp New Model M Pause/Break key fix
case 0x7A: return 0x56; // page down case 0x7A: return 0x56; // page down
case 0x7D: return 0x5E; // page up case 0x7D: return 0x5E; // page up
case 0x7C: return 0x7F; // Print Screen case 0x7C: return 0x7F; // Print Screen