diff --git a/src/bus/io.zig b/src/bus/io.zig
index e7cf567..08c529b 100644
--- a/src/bus/io.zig
+++ b/src/bus/io.zig
@@ -21,7 +21,7 @@ pub const Io = struct {
             .vcount = .{ .raw = 0x0000 },
             .ime = false,
             .ie = .{ .raw = 0x0000 },
-            .keyinput = .{ .raw = 0x01FF },
+            .keyinput = .{ .raw = 0x03FF },
         };
     }