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- ; optimize free settings,
- ORG 8000h ; Start address of the code
- START:
- LD A, 0FFh ; Set A register to 0xFF (all bits set to 1)
- OUT (0), A ; Output the value of A to the firewall control port
- LOOP:
- IN A, (1) ; Read the incoming packet from the input port
- CP 10h ; Compare the packet value with 0x10
- ; If the packet value is less than 0x10, allow the packet through
- ; by sending it to the output port
- JR NC, ALLOW
- ; If the packet value is greater than or equal to 0x10, block the packet
- ; and do not send it to the output port
- JR BLOCK
- ALLOW:
- OUT (2), A ; Output the packet value to the output port
- JR LOOP ; Continue looping to process the next packet
- BLOCK:
- ; You can add code here to handle the blocked packet, e.g., log or drop it
- JR LOOP ; Continue looping to process the next packet
- ; Add more code here if necessary
- END START
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