diff --git a/Components/9918/Implementation/9918.cpp b/Components/9918/Implementation/9918.cpp
index 574fc600a..80c67c833 100644
--- a/Components/9918/Implementation/9918.cpp
+++ b/Components/9918/Implementation/9918.cpp
@@ -885,12 +885,12 @@ void Base<personality>::commit_register(int reg, uint8_t value) {
 					case 0b0110:	break;	// TODO: srch.	[search horizontally for a colour]
 					case 0b0111:	Begin(Line);				break;	// LINE
 
-					case 0b1000:	break;	// TODO: lmmv.	[logical move, VDP to VRAM]
+					case 0b1000:	Begin(LogicalFill);			break;	// LMMV [logical move, VDP to VRAM, i.e. solid-colour fill]
 					case 0b1001:	break;	// TODO: lmmm.	[logical move, VRAM to VRAM]
 					case 0b1010:	break;	// TODO: lmcm.	[logical move, VRAM to CPU]
 					case 0b1011:	Begin(LogicalMoveFromCPU);	break;	// LMMC	[logical move, CPU to VRAM]
 
-					case 0b1100:	Begin(HighSpeedFill);		break;	// HMMV [high-speed move, VDP to VRAM]
+					case 0b1100:	Begin(HighSpeedFill);		break;	// HMMV [high-speed move, VDP to VRAM, i.e. single-byte fill]
 					case 0b1101:	break;	// TODO: hmmm.	[high-speed move, VRAM to VRAM]
 					case 0b1110:	break;	// TODO: ymmm.	[high-speed move, y only, VRAM to VRAM]
 					case 0b1111:	break;	// TODO: hmmc.	[high-speed move, CPU to VRAM]
diff --git a/Components/9918/Implementation/YamahaCommands.hpp b/Components/9918/Implementation/YamahaCommands.hpp
index 85754d179..f0273b5d4 100644
--- a/Components/9918/Implementation/YamahaCommands.hpp
+++ b/Components/9918/Implementation/YamahaCommands.hpp
@@ -296,6 +296,20 @@ struct HighSpeedFill: public Rectangle<false, false> {
 	}
 };
 
+struct LogicalFill: public Rectangle<false, false> {
+	LogicalFill(CommandContext &context) : Rectangle(context) {
+		cycles = 64;
+		access = AccessType::PlotPoint;
+	}
+
+	void advance(int pixels_per_byte) final {
+		cycles = 72;
+		if(!advance_pixel(pixels_per_byte)) {
+			cycles += 64;
+		}
+	}
+};
+
 }
 }
 }