8233,8253In accordance with the note to set the frequency and 8253 timer / counter of delay time. 8253 s CLK0 then 1MHz clock, GATE0 then 5 V, OUT0 then 8255 the PA0, J1 next speaker, programming the computer as the number keys 1,2,3,4,5,6,7 flower button, press that issued the corresponding scale. Requirements: (1) layer to 8255 next eight switch K1 ~ K8, so flower keystrokes. (2) 8253 control speakers, struck a different switch, the issue of the appropriate scale.-In accordance with the note to set the frequency and 8253 timer/counter of delay time. 8253 s CLK0 then 1MHz clock, GATE0 then 5 V, OUT0 then 8255 the PA0, J1 next speaker, programming the computer as the number keys 1,2,3,4,5,6,7 flower button, press that issued the corresponding scale. Requirements: (1) layer to 8255 next eight switch K1 ~ K8, so flower keystrokes. (2) 8253 control speakers, struck a different switch, the issue of the appropriate scale.