8253 channel 0 0 work in way (pulse counting the interrupt), single pulse generated by the key access CLK0, counting the initial value of 0 fh, Manually enter them one by one single pulse, programming on a computer screen display count value, using logical pen observation OUT0 state, the keyboard has a key press Returns the DOS.

5\A.ASM
.\A.rar
.\B.ASM
.\C.ASM
.\D.ASM
.\F.ASM
5

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