diff --git a/src/core/nds9/dma.zig b/src/core/nds9/dma.zig
index 6a281f2..fb1ab39 100644
--- a/src/core/nds9/dma.zig
+++ b/src/core/nds9/dma.zig
@@ -219,7 +219,7 @@ fn Controller(comptime id: u2) type {
                 const start_timing: Kind = @enumFromInt(new.start_timing.read());
 
                 switch (start_timing) {
-                    .immediate, .vblank => {},
+                    .immediate, .vblank, .hblank => {},
                     else => log.err("TODO: Implement DMA({}) {s} mode", .{ id, @tagName(start_timing) }),
                 }
 
diff --git a/src/core/nds9/io.zig b/src/core/nds9/io.zig
index c776aca..30e698c 100644
--- a/src/core/nds9/io.zig
+++ b/src/core/nds9/io.zig
@@ -65,6 +65,7 @@ pub fn read(bus: *const Bus, comptime T: type, address: u32) T {
             0x0400_0210 => bus.io.ie.raw,
             0x0400_0214 => bus.io.irq.raw,
 
+            0x0400_0280 => bus.io.div.cnt.raw,
             0x0400_02A0, 0x0400_02A4 => @truncate(bus.io.div.result >> shift(u64, address)),
             0x0400_02A8, 0x0400_02AC => @truncate(bus.io.div.remainder >> shift(u64, address)),
             0x0400_02B4 => @truncate(bus.io.sqrt.result),
@@ -175,6 +176,8 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
                 bus.wram.update(bus.io.shr.wramcnt);
             },
 
+            0x0400_0280 => bus.io.div.cnt.raw = value,
+
             0x0400_0290, 0x0400_0294 => {
                 bus.io.div.numerator = subset(u64, u32, address, bus.io.div.numerator, value);
                 bus.io.div.schedule(bus.scheduler);
@@ -185,6 +188,11 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
                 bus.io.div.schedule(bus.scheduler);
             },
 
+            0x0400_02A0, 0x0400_02A4 => bus.io.div.result = subset(u64, u32, address, bus.io.div.result, value),
+            0x0400_02A8, 0x0400_02AC => bus.io.div.remainder = subset(u64, u32, address, bus.io.div.remainder, value),
+
+            0x0400_02B0 => bus.io.sqrt.cnt.raw = value,
+
             0x0400_02B8, 0x0400_02BC => {
                 bus.io.sqrt.param = subset(u64, u32, address, bus.io.sqrt.param, value);
                 bus.io.sqrt.schedule(bus.scheduler);