Basic implementation of serial IO registers, but without actual serial IO support. Needed to run a certain software check cartridge that is floating around.

1 files changed, 3 insertions, 0 deletions

diff --git a/io.h b/io.h
index 8d5b04c..6381794 100644
--- a/io.h
+++ b/io.h
@@ -57,6 +57,9 @@ typedef struct {
 	uint8_t  output;
 	uint8_t  control;
 	uint8_t  input[3];
+	uint8_t  serial_out;
+	uint8_t  serial_in;
+	uint8_t  serial_ctrl;
 	uint8_t  device_type;
 } io_port;