wm: 5551

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fix some bugs, (thanks mh!)

--- a/5551e.c

+++ b/5551e.c

@@ -57,6 +57,7 @@

 				break;

 			case NOR:

 				r.regs[c] = !(a | b);

+				break;

 			case XOR:

 				r.regs[c] = a ^ b;

 				break;

@@ -67,10 +68,10 @@

 				r.regs[c] = add_bit(a, b, &r.flags[CARRY]);

 				break;

 			case SHR:

-				r.regs[c] = r.regs[a] >> b;

+				r.regs[c] = a >> b;

 				break;

 			case SHL:

-				r.regs[c] = r.regs[a] << b;

+				r.regs[c] = a << b;

 				break;

 			case PUT:

 				memory[b] = a;