diff --git a/tests/sat/grom_cpu.v b/tests/sat/grom_cpu.v
index f9fef043b..914c0f56c 100644
--- a/tests/sat/grom_cpu.v
+++ b/tests/sat/grom_cpu.v
@@ -185,7 +185,7 @@ module grom_cpu(
 													`ifdef DISASSEMBLY
 													$display("INC R%d",IR[1:0]);
 													`endif
-													alu_op  <= 4'b0001;     // ALU_OP_ADD
+													alu_op  <= 4'b0000;     // ALU_OP_ADD
 													end
 											2'b01 : begin
 													`ifdef DISASSEMBLY
diff --git a/tests/sat/ram_memory.v b/tests/sat/ram_memory.v
index 053ef206c..0d91514b2 100644
--- a/tests/sat/ram_memory.v
+++ b/tests/sat/ram_memory.v
@@ -27,6 +27,8 @@ module ram_memory(
 	store[256] <= 8'b11010001; // OUT [0],R1
 	store[257] <= 8'b00000000; //
 	store[258] <= 8'b01111110; // RET
+
+	store[512] <= 8'b00000000;
   end
 
   always @(posedge clk)