BrokenThorn Entertainment

Hi again,

How will the below codes generate some tone although you disable the speaker?

How do the codes work?

; disables the speaker, and stop using channel 2
mov dx, 0x61
out dx, 0

; generates tone from speaker
out dx, 11111101b


thanks

Hi, In the tutorial, you say: "Counter 0's OUT line indirectly connects to the PIC's IR0 line. Knowing that, when the IR0 line is low, the PIC will call the IRQ 0 handler defined by us. " What is "Connecting Indirectly"? Why will the PIC call the IRQ 0 handler defined by us,when the IR0 line is low?...