bio2: add definitions for 20th anniversary model

src/main/bio2/bi2a-ddr.h

@@ -0,0 +1,56 @@
+#ifndef BIO2_BI2A_DDR
+#define BIO2_BI2A_DDR
+
+#include "bio2/bio2.h"
+
+#pragma pack(push, 1)
+
+struct bi2a_ddr_system_panel {
+    uint8_t b_unk1 : 1;
+    uint8_t b_coin : 1;
+    uint8_t b_service : 1;
+    uint8_t b_test : 1;
+    uint8_t b_un2 : 4;
+};
+
+struct bi2a_ddr_player_1_panel {
+    uint8_t b_unk : 3;
+    uint8_t b_right : 1;
+    uint8_t b_left : 1;
+    uint8_t b_down : 1;
+    uint8_t b_up : 1;
+    uint8_t b_start : 1;
+};
+
+struct bi2a_ddr_player_2_panel {
+    uint8_t b_unk1 : 1;
+    uint8_t b_right : 1;
+    uint8_t b_left : 1;
+    uint8_t b_down : 1;
+    uint8_t b_up : 1;
+    uint8_t b_start : 1;
+    uint8_t b_unk2 : 2;
+};
+
+struct bi2a_ddr_state_in {
+    uint8_t unk1;
+    struct bi2a_ddr_system_panel system;
+    uint8_t unk2[7];
+    struct bi2a_ddr_player_1_panel player_1;
+    struct bi2a_ddr_player_2_panel player_2;
+    uint8_t unk3[5];
+};
+
+struct bi2a_ddr_state_out {
+    uint8_t unk1[40];
+};
+
+_Static_assert(
+    sizeof(struct bi2a_ddr_state_in) == 16,
+    "bi2a_ddr_state_in is the wrong size");
+_Static_assert(
+    sizeof(struct bi2a_ddr_state_out) == 40,
+    "bi2a_ddr_state_out is the wrong size");
+#pragma pack(pop)
+
+#endif

src/main/bio2/bio2.h

@@ -11,6 +11,11 @@ enum bio2_bi2a_cmd {
     BIO2_BI2A_CMD_INIT = 0x0100,
     BIO2_BI2A_CMD_WATCHDOG = 0x0120,
     BIO2_BI2A_CMD_POLL = 0x0152, // For IIDX
+    // For games using libacio for BIO2 communication
+    BIO2_BI2A_CMD_ACIO_POLL_NOWD = 0x0112,
+    BIO2_BI2A_CMD_ACIO_POLL_WD = 0x0113,
+    BIO2_BI2A_CMD_TAPELED_INIT = 0x0140,
+    BIO2_BI2A_CMD_TAPELED_SEND = 0x0141,
 };
 
 #endif