diff --git a/src/86box.c b/src/86box.c
index 82eedbd78..9b77263a2 100644
--- a/src/86box.c
+++ b/src/86box.c
@@ -1062,7 +1062,7 @@ pc_init_modules(void)
 void
 pc_send_ca(uint16_t sc)
 {
-    /* Use R-Alt because 5576-002 keyboard assigns L-Alt as  */
+    /* Use R-Alt because PS/55 DOS assigns L-Alt as Kanji */
     keyboard_input(1, 0x1D); /* Ctrl key pressed */
     keyboard_input(1, 0x138); /* R-Alt key pressed */
     keyboard_input(1, sc);
diff --git a/src/config.c b/src/config.c
index 2c0781028..7a5d76465 100644
--- a/src/config.c
+++ b/src/config.c
@@ -456,6 +456,7 @@ load_video(void)
     ibm8514_active                   = ibm8514_standalone_enabled;
     xga_standalone_enabled           = !!ini_section_get_int(cat, "xga", 0);
     xga_active                       = xga_standalone_enabled;
+    da2_standalone_enabled           = !!ini_section_get_int(cat, "da2", 0);
     show_second_monitors             = !!ini_section_get_int(cat, "show_second_monitors", 1);
     video_fullscreen_scale_maximized = !!ini_section_get_int(cat, "video_fullscreen_scale_maximized", 0);
 
@@ -2013,6 +2014,11 @@ save_video(void)
     else
         ini_section_set_int(cat, "xga", xga_standalone_enabled);
 
+    if (da2_standalone_enabled == 0)
+        ini_section_delete_var(cat, "da2");
+    else
+        ini_section_set_int(cat, "da2", da2_standalone_enabled);
+
     // TODO
     for (uint8_t i = 1; i < GFXCARD_MAX; i ++) {
         if (gfxcard[i] == 0)
diff --git a/src/mca.c b/src/mca.c
index 871060bb4..a14fea6fa 100644
--- a/src/mca.c
+++ b/src/mca.c
@@ -101,3 +101,19 @@ mca_add(uint8_t (*read)(int addr, void *priv), void (*write)(int addr, uint8_t v
         }
     }
 }
+
+void
+mca_add_to_slot(uint8_t (*read)(int addr, void* priv), void (*write)(int addr, uint8_t val, void* priv), uint8_t(*feedb)(void* priv), void (*reset)(void* priv), void* priv, int c)
+{
+    if (mca_card_read[c] || mca_card_write[c])
+    {
+        //pclog("cannot add the device to slot %d\n", num);
+        return;
+    }
+    mca_card_read[c] = read;
+    mca_card_write[c] = write;
+    mca_card_feedb[c] = feedb;
+    mca_card_reset[c] = reset;
+    mca_priv[c] = priv;
+    return;
+}