From 5c8eaca55c025d3344f8789ce485763e104c354b Mon Sep 17 00:00:00 2001
From: Denis Nutiu <denis.nutiu@gmail.com>
Date: Sun, 8 Dec 2024 16:50:54 +0200
Subject: [PATCH] take last nibble of font address in VX

---
 src/emulator.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/emulator.rs b/src/emulator.rs
index 84c913c..39329fd 100644
--- a/src/emulator.rs
+++ b/src/emulator.rs
@@ -365,7 +365,7 @@ where
                 }
             }
             ProcessorInstruction::FontCharacter(vx) => {
-                self.index_register = 0xF0 + (self.registers[vx as usize] as u16) * 5u16;
+                self.index_register = 0xF0 + (self.registers[vx as usize] as u16 & 0xF) * 5u16;
             }
             ProcessorInstruction::BinaryCodedDecimalConversion(vx) => {
                 let number = self.registers[vx as usize];