diff --git a/src/emulation.c b/src/emulation.c
index c14c886..b57c4f1 100644
--- a/src/emulation.c
+++ b/src/emulation.c
@@ -41,14 +41,14 @@ emul_nop(rk65c02emu_t *e, instruction_t *i)
 
 /* PHA - push accumulator to stack */
 void
-emul_pha(rk6502emu_t *e, instruction_t *i)
+emul_pha(rk65c02emu_t *e, instruction_t *i)
 {
 	stack_push(e, e->regs.A);
 }
 
 /* PLA - pull from stack to accumulator */
 void
-emul_pla(rk65c02emu_t *e, instruciton_t *i)
+emul_pla(rk65c02emu_t *e, instruction_t *i)
 {
 	e->regs.A = stack_pop(e);
 
diff --git a/src/emulation.h b/src/emulation.h
index 2a03c91..e3d83b5 100644
--- a/src/emulation.h
+++ b/src/emulation.h
@@ -7,6 +7,8 @@
 void emul_and(rk65c02emu_t *, instruction_t *);
 void emul_lda(rk65c02emu_t *, instruction_t *);
 void emul_nop(rk65c02emu_t *, instruction_t *);
+void emul_pha(rk65c02emu_t *, instruction_t *);
+void emul_pla(rk65c02emu_t *, instruction_t *);
 void emul_stp(rk65c02emu_t *, instruction_t *);
 
 #endif /* _EMULATION_H_*/
diff --git a/src/instruction.h b/src/instruction.h
index 71760a2..ce7b5a5 100644
--- a/src/instruction.h
+++ b/src/instruction.h
@@ -46,6 +46,7 @@ void disassemble(bus_t *, uint16_t);
 uint8_t instruction_data_read_1(rk65c02emu_t *, instrdef_t *, instruction_t *);
 void instruction_status_adjust_zero(rk65c02emu_t *, uint8_t);
 void instruction_status_adjust_negative(rk65c02emu_t *, uint8_t);
-//void instruction_execute(rk65c02emu_t *, instruction_t *);
+void stack_push(rk65c02emu_t *, uint8_t);
+uint8_t stack_pop(rk65c02emu_t *);
 
 #endif /* _INSTRUCTION_H_ */