instructions rename and uninitialized memory error fix

examples/s.tasm

@@ -4,13 +4,13 @@
 
 .data:
 // named array of 8-bit values
-const8 msg "Hello, World :3\0"
+const8 msg "Hello, World :3\n\0"
 
 .main:
-push ax 1; // sys_write
-push bx 1; // stdout
-push cx @msg; // address of msg data
-push dx #msg; // size of msg data
+movc ax 1; // sys_write
+movc bx 1; // stdout
+movc cx @msg; // address of msg data
+movc dx #msg; // size of msg data
 sys
-push ax 0
+movc ax 0
 exit