add: Add bus

1 files changed, 29 insertions, 0 deletions

diff --git a/Q1.core/Components/IAddressable.cs b/Q1.core/Components/IAddressable.cs
new file mode 100644
index 0000000..54218d9
--- /dev/null
+++ b/Q1.core/Components/IAddressable.cs
@@ -0,0 +1,29 @@
+namespace Q1.core.Components;
+
+public interface IAddressable
+{
+    public u8 Read(u16 address);
+    public void Write(u16 address, u8 value);
+    public void Clock();
+
+    public u16 AddressableStart { get; }
+    public u16 AddressableEnd { get; }
+}
+
+public static class AddressableExtensions
+{
+    public static u16 ReadWord(this IAddressable bus, u16 address)
+    {
+        u8 high = bus.Read(address);
+        u8 low = bus.Read((u16) (address + 1));
+        return (u16) ((high << 8) | low);
+    }
+
+    public static void WriteWord(this IAddressable bus, u16 address, u16 value)
+    {
+        u8 high = (u8) (value       & 0xFF);
+        u8 low = (u8) ((value >> 8) & 0xFF);
+        bus.Write(address, low);
+        bus.Write((u16) (address + 1), high);
+    }
+}
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