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quald

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is there on-screen keyboard written in x86 assembly?

There are whole operating systems(kolibriOS and menuetOS), bootloaders and applications written in assembly, but is there an on-screen keyboard program too?
I'd like to regularly use it with my touchscreen UMPC(tablet pc) across entire windows xp, and it also should have minimal-footprint of CPU, RAM, HDD(or use less than 10-20 MB of HDD).

+  is there any bios modders who made on-screen keyboard always working, at bios(UEFI, EFI) level(as optional, loadable module, maybe)?

+  And is there bios'es that have on-screen keyboard just being shown as overlay keyboard with hide/show button(like in DosBox on android), being independent from any OS, just like when you type security pin at BitLocker screen(https://h30434.www3.hp.com/t5/image/serverpage/image-id/141539iDCB9FE134F283644?v=1.0), or as transparently overlayed keyboard(like DosBox !)
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Dave Baldwin
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quald

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@Dave Baldwin , but what if there is  or will be a BIOS, that supports touchscreen and mouse (as loadable code)?
I don't know of any.
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no appropriate option