diff --git a/execute.go b/execute.go
index e69de29..44db7aa 100644
--- a/execute.go
+++ b/execute.go
@@ -0,0 +1,40 @@
+package main
+
+type state struct {
+	register r,
+	memory m
+}
+
+func step(state *S) {
+
+}
+
+const modeNone = -1
+const modeImmediate = 0
+const modeZeroPage = 1
+const modeAbsolute = 2 
+
+type opcode struct {
+	name string
+	code int8
+	bytes int
+	cycles int
+	mode int
+}
+
+// https://www.masswerk.at/6502/6502_instruction_set.html
+
+func opA1LDA(state *, opcode) {
+	value := s->memory
+	s->register.setRegister(regA, value)
+
+}
+
+func opLDA(state *s, reg, mode, arg) {
+}
+
+opcodes := []Opcode{
+	0: opcode('BRK', 0x0, 1, 7, modeImmediate)
+	1:
+}
+
diff --git a/memory.go b/memory.go
index e69de29..b2a1091 100644
--- a/memory.go
+++ b/memory.go
@@ -0,0 +1,4 @@
+package main
+
+type memory [65536]uint8
+