"Paul_" <nebeyra@nebera.mailo> wrote in message news:qbbvi3$s3a$1@trimpas.omnitel.net... > Beje ar visos belaides Logitech klaviaturos reaguoja tik i viena klaviso > paspaudima vienu metu? > Man kazkaip ant Logitech MK520 per Windows 8.1 nenori registruoti iskarto > dvieju nuspaudimu. Gal cia egzemplioriaus defektas klaviaturos ar usb > receiverio? tikrai ne visos, sakyciau dauguma 6 tikrai gali perduoti galima pasitikrinti https://drakeirving.github.io/MultiKeyDisplay/ jei gilintis, tai maksimalus perduodamu nuspaustu klavisu skaicius dazniausiai dar priklausys ir nuo to, kokie klavisai bus spaudziami. is karto galiu pasakyti, kad dideles logikos kurie tai bus klavisai, nesimatys, nes tai priklausys dar ir nuo to, kaip sujungineta klavisu matrica viduje. pvz gali pasirodyt, kad klaviatura gali perduoti 6 klavisus vienu metu, bet is tikro bus tokiu, i kuriuos jau nereaguos pvz esant nuspaustiems viso labo 5. bus ir tokiu, kurie isskirti individualiai (dazniausiai visokie ctrl/alt/shift), ir zaidziant su jais, klaviatura gali gebeti perduoti net 8 nuspaustus klavisus vienu metu. bet jei nesigilinant i niuansus, tai bazine info orientacijai yra tokia: The USB HID keyboard driver is limited to 6-key rollover per device. PS/2 has no such limitation. Some USB keyboards are comprised of more than one logical USB device, for example in order to get 12-key rollover. Today most of personal computer is using USB interface as your primary keyboard connection, and some keyboard may use bluetooth wireless connection. Regardless which connection it was used, your operating system will recognize your keyboard as Human Interface Devices (a.k.a. HID) and there are two operating mode, “Boot Protocol” and “Report Protocol”. When your computer boots, your keyboard is registered as Boot Protocol by BIOS (Basic Input/Output System). The limitation of Boot Protocol can only transmit 8-bytes of key press data; 2-bytes are reserved for modified key and reserved key, and 6-bytes are usable to receive your key inputs. Each key press is 1 byte, therefore, 6-key rollover meaning only 6 key press including modified key (for example, Control + C key) can be done at the same time. https://www.youtube.com/watch?v=kOkV9BalNcw