Fix Mega Drive peripheral ID for 3-button pad

1 files changed, 3 insertions, 0 deletions

diff --git a/io.c b/io.c
index c43281f..5b77c1b 100644
--- a/io.c
+++ b/io.c
@@ -935,6 +935,9 @@ uint8_t io_data_read(io_port * port, uint32_t current_cycle)
 	case IO_GAMEPAD3:
 	{
 		input = port->input[th ? GAMEPAD_TH1 : GAMEPAD_TH0];
+		if (!th) {
+			input |= 0xC;
+		}
 		break;
 	}
 	case IO_GAMEPAD6: