Initial commit

1 files changed, 49 insertions, 0 deletions

diff --git a/Chip/RamDevice.cs b/Chip/RamDevice.cs
new file mode 100644
index 0000000..6811d22
--- /dev/null
+++ b/Chip/RamDevice.cs
@@ -0,0 +1,49 @@
+namespace Q1Emu.Chip;
+
+using System;
+using System.Runtime.CompilerServices;
+
+public class RamDevice : BusDevice
+{
+    public u8[] Memory;
+
+    public RamDevice(u16 start, u16 size) : base(start, (u16) (start + size))
+    {
+        this.Memory           = new u8[size];
+    }
+    
+    public override void Reset()
+    {
+        this.Memory = new u8[this.AddressableEnd - this.AddressableStart];
+    }
+    
+    public override void Clock()
+    {
+        // No clocking needed for RAM
+    }
+
+    public override u8 Read(u16 address)
+    {
+        u16 relativeAddress = this.GetRelativeAddress(address);
+        return this.Memory[relativeAddress];
+    }
+
+    public override void Write(u16 address, u8 value)
+    {
+        u16 relativeAddress = this.GetRelativeAddress(address);
+        this.Memory[relativeAddress] = value;
+    }
+
+    public override ref8 ReadSeq(u16 address, u16 length)
+    {
+        u16 relativeAddress = this.GetRelativeAddress(address);
+        // Console.WriteLine($"{address:X4} {relativeAddress:X4} {length:X4}");
+        return new ref8(this.Memory, relativeAddress, length);
+    }
+    
+    public override void WriteSeq(u16 address, u16 length, ref8 value)
+    {
+        ref8 destination = this.ReadSeq(address, length);
+        value.CopyTo(destination);
+    }
+}
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