BIOS , ( ) . , , IRQ1 ( 09h). , Int 16h . Ctrl+Alt+Del, PrintScreen (SysRq) , . , (, ), IRQ1, Int 09h. - .
POST ( ) . , NumLock ( BIOS Setup). - F1 . , (, - ), F1 . AT XT, . () (POST F1), CMOS Setup.
BIOS (BIOS Data Area):
♦ 0:0417, 0:418 ;
♦ 0:0419 Alt-;
♦ 0:041A (Buffer Head), 2 ( );
♦ 0:041C (Buffer Tail), 2 ( );
♦ 0:041E-0:042D (16 ).
, . (, ). : Bus Mouse, Serial Mouse PS/2-Mouse. USB, ( USB, USB).
Serial Mouse PS/2-Mouse . , , , .
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♦ PS/2 , +5 GND. RS-232C, Serial Mouse, (. . 2.1) +3 -3 , ( GND) .
♦ PS/2 , , . Serial Mouse .
, , . (!), . , , , . , Serial Mouse PS/2-Mouse.
Macintosh, , PS/2. PC , , .