PS/2 keyboard/8042 resets and port signal vs keyboard scanning the matrix of keys? \ VOGONS

PS/2 keyboard/8042 resets and port signal vs keyboard scanning the matrix of keys?

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First post, by superfury

Posted on 2018-10-26, 12:35

superfury Offline

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I notice that when the BIOS is still running and a key is pressed in UniPCemu, the BIOS errors out on the PS/2 keyboard?

Are there some undocumented cases where scanning is disabled during poweron or POST? If so, how is that done(on XT/AT/Compaq Deskpro 386)?

Last edited by superfury on 2018-10-29, 13:42. Edited 1 time in total.

Author of the UniPCemu emulator.
UniPCemu Git repository
UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

Reply 1 of 2, by superfury

Posted on 2018-10-27, 21:29

superfury Offline

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Is something required gor a PS/2 keyboard to start scanning after poweron? Maybe the Enable command? Or maybe something on the 8042(First port being disabled on poweron)? Anyone?

Author of the UniPCemu emulator.
UniPCemu Git repository
UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

Reply 2 of 2, by Azarien

Posted on 2018-10-29, 14:52

Azarien Offline

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Once I connected a PS/2 keyboard to a microcontroller (ATtiny2313) to display incoming scancodes on LEDs. No initialization was needed, just reading the clock and data lines. I didn't even bother to implement host-to-keyboard communication.

This PDF may be of interest: https://www.avrfreaks.net/sites/default/files … %20Keyboard.pdf

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