diff --git a/test/test_emulation.c b/test/test_emulation.c
index 9b04af3..435fd20 100644
--- a/test/test_emulation.c
+++ b/test/test_emulation.c
@@ -1419,6 +1419,38 @@ ATF_TC_BODY(emul_smb, tc)
 	}
 }
 
+ATF_TC_WITHOUT_HEAD(emul_trb);
+ATF_TC_BODY(emul_trb, tc)
+{
+	rk65c02emu_t e;
+	bus_t b;
+
+	b = bus_init_with_default_devs();
+	e = rk65c02_init(&b);
+
+	ATF_REQUIRE(rom_start(&e, "test_emulation_trb.rom", tc));
+
+	ATF_CHECK(bus_read_1(&b, 0x10) == 0x84);
+	ATF_CHECK(bus_read_1(&b, 0x11) == 0xA6);
+
+}
+
+ATF_TC_WITHOUT_HEAD(emul_tsb);
+ATF_TC_BODY(emul_tsb, tc)
+{
+	rk65c02emu_t e;
+	bus_t b;
+
+	b = bus_init_with_default_devs();
+	e = rk65c02_init(&b);
+
+	ATF_REQUIRE(rom_start(&e, "test_emulation_tsb.rom", tc));
+
+	ATF_CHECK(bus_read_1(&b, 0x10) == 0xB7);
+	ATF_CHECK(bus_read_1(&b, 0x11) == 0xE7);
+
+}
+
 ATF_TC_WITHOUT_HEAD(emul_wrap_izpx);
 ATF_TC_BODY(emul_wrap_izpx, tc)
 {
@@ -1540,6 +1572,8 @@ ATF_TP_ADD_TCS(tp)
 	ATF_TP_ADD_TC(tp, emul_sbc_bcd);
 	ATF_TP_ADD_TC(tp, emul_rmb);
 	ATF_TP_ADD_TC(tp, emul_smb);
+	ATF_TP_ADD_TC(tp, emul_trb);
+	ATF_TP_ADD_TC(tp, emul_tsb);
 
 	ATF_TP_ADD_TC(tp, emul_sign_overflow_basic);
 	ATF_TP_ADD_TC(tp, emul_sign_overflow_thorough);
diff --git a/test/test_emulation_trb.s b/test/test_emulation_trb.s
new file mode 100644
index 0000000..c66d60f
--- /dev/null
+++ b/test/test_emulation_trb.s
@@ -0,0 +1,12 @@
+start:	lda #0xa6
+	sta 0x10
+	lda #0x33
+	trb 0x10
+
+	lda #0xa6
+	sta 0x11
+	lda #0x41
+	trb 0x11	
+
+	stp
+
diff --git a/test/test_emulation_tsb.s b/test/test_emulation_tsb.s
new file mode 100644
index 0000000..b61411f
--- /dev/null
+++ b/test/test_emulation_tsb.s
@@ -0,0 +1,12 @@
+start:	lda #0xa6
+	sta 0x10
+	lda #0x33
+	tsb 0x10
+
+	lda #0xa6
+	sta 0x11
+	lda #0x41
+	tsb 0x11	
+
+	stp
+