From df6caea5746b37ec5a30c55affd2f98a01c57cfe Mon Sep 17 00:00:00 2001
From: vik <>
Date: Mon, 30 Dec 2024 17:50:21 -0600
Subject: [PATCH] adding memory read

---
 src/main.rs | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 0489ac7..aac2bba 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,5 @@
+const PC_START: u16 = 0x3000;
+
 #[allow(dead_code)]
 enum Registers {
 	R0 = 0,
@@ -41,7 +43,21 @@ enum ConditionFlags {
 }
 
 fn main() {
-	let _memory:[u16; 1 << 16];
-	let _registers:[u16; Registers::COUNT as usize];
+	let _memory:[u16; 1 << 16] = [0; 1 << 16];
+	let mut registers:[u16; Registers::COUNT as usize] = [0; Registers::COUNT as usize];
 	
+	registers[Registers::COND as usize] = ConditionFlags::ZERO as u16;
+	registers[Registers::PC as usize] = PC_START;
+
+	// set running state
+	let mut running:bool = true;
+	while running {
+		let index: u16 = registers[Registers::PC as usize];
+		let mut instr:u16 = _memory[index as usize];
+		registers[Registers::PC as usize] += 1;
+		match instr >> 12 {
+		  op if op == Opcodes::ADD as u16 => todo!(),
+			_ => todo!(),
+		}
+	}
 }