diff --git a/src/lr35902/emitter-lr35902.h b/src/lr35902/emitter-lr35902.h
index 59b9925e4..ef4511377 100644
--- a/src/lr35902/emitter-lr35902.h
+++ b/src/lr35902/emitter-lr35902.h
@@ -13,7 +13,7 @@
 	DECLARE_INSTRUCTION_LR35902(EMITTER, NOP), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDBC), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDBC_A), \
-	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
+	DECLARE_INSTRUCTION_LR35902(EMITTER, INCBC), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDB_), \
@@ -21,14 +21,14 @@
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
-	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
+	DECLARE_INSTRUCTION_LR35902(EMITTER, DECBC), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDC_), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDDE), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDDE_A), \
-	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
+	DECLARE_INSTRUCTION_LR35902(EMITTER, INCDE), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
@@ -37,7 +37,7 @@
 	DECLARE_INSTRUCTION_LR35902(EMITTER, JR), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
-	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
+	DECLARE_INSTRUCTION_LR35902(EMITTER, DECDE), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDE_), \
@@ -45,7 +45,7 @@
 	DECLARE_INSTRUCTION_LR35902(EMITTER, JRNZ), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDHL), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDIHLA), \
-	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
+	DECLARE_INSTRUCTION_LR35902(EMITTER, INCHL), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDH_), \
@@ -53,7 +53,7 @@
 	DECLARE_INSTRUCTION_LR35902(EMITTER, JRZ), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
-	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
+	DECLARE_INSTRUCTION_LR35902(EMITTER, DECHL), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDL_), \
@@ -61,7 +61,7 @@
 	DECLARE_INSTRUCTION_LR35902(EMITTER, JRNC), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDSP), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDDHLA), \
-	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
+	DECLARE_INSTRUCTION_LR35902(EMITTER, INCSP), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDHL_), \
@@ -69,7 +69,7 @@
 	DECLARE_INSTRUCTION_LR35902(EMITTER, JRC), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
-	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
+	DECLARE_INSTRUCTION_LR35902(EMITTER, DECSP), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, STUB), \
 	DECLARE_INSTRUCTION_LR35902(EMITTER, LDA_), \
diff --git a/src/lr35902/isa-lr35902.c b/src/lr35902/isa-lr35902.c
index ddb2d3741..6bbf1a6d1 100644
--- a/src/lr35902/isa-lr35902.c
+++ b/src/lr35902/isa-lr35902.c
@@ -364,6 +364,33 @@ DEFINE_INSTRUCTION_LR35902(LDIOA, \
 	cpu->executionState = LR35902_CORE_READ_PC; \
 	cpu->instruction = _LR35902InstructionLDIOADelay;)
 
+#define DEFINE_INCDEC_INSTRUCTION_LR35902(REG) \
+	DEFINE_INSTRUCTION_LR35902(INC ## REG, \
+		uint16_t reg = LR35902Read ## REG (cpu); \
+		LR35902Write ## REG (cpu, reg + 1); \
+		/* TODO: Stall properly */ \
+		cpu->cycles += 4;) \
+	DEFINE_INSTRUCTION_LR35902(DEC ## REG, \
+		uint16_t reg = LR35902Read ## REG (cpu); \
+		LR35902Write ## REG (cpu, reg - 1); \
+		/* TODO: Stall properly */ \
+		cpu->cycles += 4;) \
+
+
+DEFINE_INCDEC_INSTRUCTION_LR35902(BC);
+DEFINE_INCDEC_INSTRUCTION_LR35902(DE);
+DEFINE_INCDEC_INSTRUCTION_LR35902(HL);
+
+DEFINE_INSTRUCTION_LR35902(INCSP,
+	++cpu->sp;
+	// TODO: Stall properly
+	cpu->cycles += 4;)
+
+DEFINE_INSTRUCTION_LR35902(DECSP,
+	--cpu->sp;
+	// TODO: Stall properly
+	cpu->cycles += 4;)
+
 DEFINE_INSTRUCTION_LR35902(DI, cpu->irqh.setInterrupts(cpu, false));
 DEFINE_INSTRUCTION_LR35902(EI, cpu->irqh.setInterrupts(cpu, true));