diff --git a/homework8/homework8.pdsprj b/homework8/homework8.pdsprj
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index 0000000..4766d05
Binary files /dev/null and b/homework8/homework8.pdsprj differ
diff --git a/homework8/src/homework1.c b/homework8/src/homework1.c
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+++ b/homework8/src/homework1.c
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+#include <reg52.h>
+sbit ADDR0 = P1 ^ 0;
+sbit ADDR1 = P1 ^ 1;
+sbit ADDR2 = P1 ^ 2;
+sbit ADDR3 = P1 ^ 3;
+sbit ENLED = P1 ^ 4;
+sbit LED9  = P0 ^ 7;
+sbit LED8  = P0 ^ 6;
+sbit LED7  = P0 ^ 5;
+sbit LED6  = P0 ^ 4;
+sbit KEY1  = P2 ^ 4;
+sbit KEY2  = P2 ^ 5;
+sbit KEY3  = P2 ^ 6;
+sbit KEY4  = P2 ^ 7;
+void main()
+{
+    ENLED = 0;
+    ADDR3 = 1;
+    ADDR2 = 1;
+    ADDR1 = 1;
+    ADDR0 = 0;
+    P2    = 0xF7;
+    while (1) {
+        LED9 = KEY1;
+        LED8 = KEY2;
+        LED7 = KEY3;
+        LED6 = KEY4;
+    }
+}
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