diff --git a/src/main/acio/acio.h b/src/main/acio/acio.h
index effea99..b8608ef 100644
--- a/src/main/acio/acio.h
+++ b/src/main/acio/acio.h
@@ -66,6 +66,7 @@ struct ac_io_message {
                 uint8_t raw[0xFF];
                 uint8_t count;
                 uint8_t status;
+                uint8_t param;
                 struct ac_io_version version;
 
                 struct ac_io_icca_misc icca_misc;
diff --git a/src/main/bio2drv/bi2a-iidx.c b/src/main/bio2drv/bi2a-iidx.c
index fb7554e..0738921 100644
--- a/src/main/bio2drv/bi2a-iidx.c
+++ b/src/main/bio2drv/bi2a-iidx.c
@@ -9,6 +9,8 @@
 
 #include "util/log.h"
 
+static const uint8_t _BIO2DR_BI2A_IIDX_INIT_DATA = 0x3B;
+
 static bool bio2drv_bi2a_iidx_init_io(uint8_t node_id)
 {
     struct ac_io_message msg;
@@ -16,7 +18,7 @@ static bool bio2drv_bi2a_iidx_init_io(uint8_t node_id)
     msg.addr = node_id + 1;
     msg.cmd.code = ac_io_u16(BIO2_BI2A_CMD_INIT);
     msg.cmd.nbytes = 1;
-    msg.cmd.count = 0x3B;
+    msg.cmd.param = _BIO2DR_BI2A_IIDX_INIT_DATA;
 
     if (!aciodrv_send_and_recv(
             &msg, offsetof(struct ac_io_message, cmd.raw) + 1)) {
diff --git a/src/main/bio2drv/bi2a-sdvx.c b/src/main/bio2drv/bi2a-sdvx.c
index 4f56266..0d1fc6d 100644
--- a/src/main/bio2drv/bi2a-sdvx.c
+++ b/src/main/bio2drv/bi2a-sdvx.c
@@ -9,6 +9,8 @@
 
 #include "util/log.h"
 
+static const uint8_t _BIO2DR_BI2A_SDVX_INIT_DATA = 0x3B;
+
 // this is probably InitIO
 static bool bio2drv_bi2a_sdvx_init_io(uint8_t node_id)
 {
@@ -17,7 +19,7 @@ static bool bio2drv_bi2a_sdvx_init_io(uint8_t node_id)
     msg.addr = node_id + 1;
     msg.cmd.code = ac_io_u16(BIO2_BI2A_CMD_INIT);
     msg.cmd.nbytes = 1;
-    msg.cmd.count = 0x3B;
+    msg.cmd.param = _BIO2DR_BI2A_SDVX_INIT_DATA;
 
     if (!aciodrv_send_and_recv(
             &msg, offsetof(struct ac_io_message, cmd.raw) + 1)) {
diff --git a/src/main/bio2emu-iidx/bi2a.c b/src/main/bio2emu-iidx/bi2a.c
index d556d0c..f67fcf5 100644
--- a/src/main/bio2emu-iidx/bi2a.c
+++ b/src/main/bio2emu-iidx/bi2a.c
@@ -85,8 +85,8 @@ void bio2_emu_bi2a_dispatch_request(
     cmd_code = ac_io_u16(req->cmd.code);
 
     switch (cmd_code) {
-        case AC_IO_CMD_CLEAR:
-            log_misc("AC_IO_CMD_CLEAR(%d)", req->addr);
+        case BIO2_BI2A_CMD_INIT:
+            log_misc("BIO2_BI2A_CMD_INIT(%d)", req->addr);
             bio2_emu_bi2a_send_status(&bio2port->acio, req, 0x00);
             break;