diff --git a/system/decoder.v b/system/decoder.v
index 0094364..1967f7a 100644
--- a/system/decoder.v
+++ b/system/decoder.v
@@ -514,6 +514,27 @@ always @( CIR or SIMPLE_MICRO or seq_addr_input ) begin
 				reg_write_addr={1'b1,CIR[10:8]};
 				seq_addr_entry=`UCODE_POP_ENTRY;
 			end
+			11'b1111_1111_100:begin
+				/*            JMP - Unconditional indirect within segment jump               */
+				/* 1 1 1 1  1 1 1 1 | MOD 1 0  1  R/M  |   < DISP-LO >    |    < DISP-HI >   */
+				`start_aligning_instruction
+				opcode_size=1;
+				has_operands=0;
+				Wbit=1;
+				IN_MOD={1'b0,CIR[7:6]};
+				RM=CIR[2:0];
+				in_alu1_sel1=2'b11;
+				if (IN_MOD==2'b11)begin
+					in_alu1_sel2=2'b01;
+					reg_read_port2_addr={Wbit,RM};
+					next_state=`PROC_EX_STATE_ENTRY;
+				end else begin
+					in_alu1_sel2=2'b00;
+					next_state=`PROC_MEMIO_READ;
+				end
+				ALU_1OP=`ALU_OP_ADD;
+				OUT_MOD=3'b101;
+			end
 			default:begin
 				`invalid_instruction
 			end