From 8b0292cccf768efdd5295fe0b662488cbc671079 Mon Sep 17 00:00:00 2001
From: crecher <crecher@crecher.net>
Date: Mon, 12 Oct 2026 04:07:09 +0200
Subject: added cart package, more tests, tests are now at ./tests and added
 .gitignore

---
 cart/mapper.go | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 cart/mapper.go

(limited to 'cart/mapper.go')

diff --git a/cart/mapper.go b/cart/mapper.go
new file mode 100644
index 0000000..7ddd8a9
--- /dev/null
+++ b/cart/mapper.go
@@ -0,0 +1,30 @@
+package cart
+
+import "fmt"
+
+type Mirroring uint8
+
+const (
+	Horizontal Mirroring = iota
+	Vertical
+	FourScreen
+	SingleScreenLower
+	SingleScreenUpper
+)
+
+type Mapper interface {
+	CPURead(addr uint16) uint8
+	CPUWrite(addr uint16, v uint8)
+	PPURead(addr uint16) uint8
+	PPUWrite(addr uint16, v uint8)
+	Mirroring() Mirroring
+}
+
+func newMapper(c *Cartridge) (Mapper, error) {
+	switch c.MapperID {
+	case 0:
+		return newNROM(c), nil
+	default:
+		return nil, fmt.Errorf("cart: unsupported mapper %d", c.MapperID)
+	}
+}
-- 
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