diff --git a/src/include/86box/vid_mda.h b/src/include/86box/vid_mda.h
index d7d51fe44..105159b0f 100644
--- a/src/include/86box/vid_mda.h
+++ b/src/include/86box/vid_mda.h
@@ -69,34 +69,35 @@ typedef enum mda_mode_flags_e
 typedef struct mda_t {
     mem_mapping_t mapping;
 
-    uint8_t crtc[MDA_CRTC_NUM_REGISTERS];
-    int     crtcreg;
+    uint8_t     crtc[MDA_CRTC_NUM_REGISTERS];
+    int32_t     crtcreg;
 
-    uint8_t mode;
-    uint8_t status;
+    uint8_t     mode;
+    uint8_t     status;
 
-    uint64_t   dispontime;
-    uint64_t   dispofftime;
-    pc_timer_t timer;
+    uint64_t    dispontime;
+    uint64_t    dispofftime;
+    pc_timer_t  timer;
 
-    int firstline;
-    int lastline;
+    int32_t     firstline;
+    int32_t     lastline;
 
-    int      fontbase;
-    int      linepos;
-    int      displine;
-    int      vc;
-    int      scanline;
-    uint16_t memaddr;
-    uint16_t memaddr_backup;
-    int      cursorvisible;
-    int      cursoron;
-    int      dispon;
-    int      blink;
-    int      vsynctime;
-    int      vadj;
-    int      monitor_index;
-    int      prev_monitor_index;
+    int32_t     fontbase;
+    int32_t     linepos;
+    int32_t     displine;
+    int32_t     vc;
+    int32_t     scanline;
+    uint16_t    memaddr;
+    uint16_t    memaddr_backup;
+    int32_t     cursorvisible;
+    int32_t     cursoron;
+    int32_t     dispon;
+    int32_t     blink;
+    int32_t     vsynctime;
+    int32_t     vadj;
+    int32_t     monitor_index;
+    int32_t     prev_monitor_index;
+    int32_t     monitor_type;           // Used for MDA Colour support (REV0 u64)
 
     uint8_t *vram;
 } mda_t;
diff --git a/src/video/vid_mda.c b/src/video/vid_mda.c
index 7c4251285..a0bd61010 100644
--- a/src/video/vid_mda.c
+++ b/src/video/vid_mda.c
@@ -186,15 +186,15 @@ mda_poll(void *priv)
                 int32_t color_bg = 0, color_fg = 0; 
     
                 // If we are using an RGBI monitor allow colour
-                //if (cga_palette == MDA_MONITOR_TYPE_RGBI)
-                //{
+                if (mda->monitor_type == MDA_MONITOR_TYPE_RGBI)
+                {
                     if (!(mda->mode & MDA_MODE_BW))
                     {
                         color_bg = (attr >> 4) & 0x0F;
                         color_fg = (attr & 0x0F); 
                     }
                         
-                //}
+                }
 
                 if (mda->scanline == 12 && ((attr & 7) == 1)) { // underline
                     for (c = 0; c < 9; c++)
@@ -360,7 +360,8 @@ mda_init(mda_t *mda)
     overscan_x = overscan_y = 0;
     mda->monitor_index      = monitor_index_global;
 
-    cga_palette = device_get_config_int("rgb_type") << 1;
+    mda->monitor_type = device_get_config_int("rgb_type");
+    cga_palette = mda->monitor_type << 1;
     if (cga_palette > 6) {
         cga_palette = 0;
     }