From 67672d06776e38b06f31f6599678767c60eed58a Mon Sep 17 00:00:00 2001
From: Hannes Schulze <haschu0103@outlook.de>
Date: Sat, 18 Jan 2025 19:35:42 +0100
Subject: implement ppu io registers

---
 src/nes/cartridge.cc | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/nes/cartridge.cc')

diff --git a/src/nes/cartridge.cc b/src/nes/cartridge.cc
index d2d11b6..861dc13 100644
--- a/src/nes/cartridge.cc
+++ b/src/nes/cartridge.cc
@@ -12,6 +12,8 @@ namespace nes
 
 	auto cartridge::from_data(void const* data, std::size_t const length) -> cartridge
 	{
+		// See: https://www.nesdev.org/wiki/INES
+
 		auto const bytes = static_cast<std::uint8_t const*>(data);
 		auto res = cartridge{};
 		res.is_valid_ = true;
@@ -29,6 +31,9 @@ namespace nes
 		res.mapper_number_ =
 			(control_1 & 0b11110000) >> 4 |
 			(control_2 & 0b11110000) >> 0;
+		res.name_table_arrangement_ = (control_1 & 0b00000001) != 0
+			? name_table_arrangement::vertical
+			: name_table_arrangement::horizontal;
 
 		// Load program data.
 		auto offset = std::size_t{ 16 };
-- 
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