Shows the design of a timing device, the experimental instrument with the left side of the six LED digital time display, time display format for the 24-hour clock. Accurate value of 59 minutes and 55 seconds at the beginning of time, calls out every second buzzer to stop the whole point of time. 74 series module 8254 module 8259 module 8255 module. PD32 experimental module in the right to verify each and every 25ms refresh 8254 followed Q_0, Q_1, Q_2, Q_3 with Q0, Q1, Q2, Q3 connected to P_0, P_1, P_2, respectively, and P0, P1, P2 connected 74: CS1 access 340H, CS2 Access 360H GATE0 then+5 V, CLOCK0 then 1.5MHZ, OUT0 then IR0, GATE1 the fourth film 8255 then B0, CLOCK1 then 93KHZ, OUT1 access buzzer, CS next 300H, A0 then address line A2, A1 then take the address line A3 8259CS1 3A0H, INT1 then INTR, INT-A Access INTA, SP/1 then+5 V 8255CS4 then CS-4

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