diff --git a/devices/video/control.cpp b/devices/video/control.cpp
index 1e58e49..e9e963a 100644
--- a/devices/video/control.cpp
+++ b/devices/video/control.cpp
@@ -388,7 +388,9 @@ void ControlVideo::enable_display()
     new_height = swatch_params[ControlRegs::VFP-1] - swatch_params[ControlRegs::VAL-1];
 
     new_width *= clk_divisor;
-    new_height >>= 1; // FIXME: assume non-interlaced mode for now
+    if (this->enables & SCAN_CONTROL) {
+        new_height >>= 1;
+    }
 
     this->active_width  = new_width;
     this->active_height = new_height;
@@ -431,7 +433,9 @@ void ControlVideo::enable_display()
     this->vert_blank = swatch_params[ControlRegs::VAL-1] +
         (swatch_params[ControlRegs::VSYNC-1] - swatch_params[ControlRegs::VFP-1]);
 
-    this->vert_blank >>= 1;
+    if (this->enables & SCAN_CONTROL) {
+        this->vert_blank >>= 1;
+    }
 
     this->hori_total = this->hori_blank + new_width;
     this->vert_total = this->vert_blank + new_height;
diff --git a/devices/video/control.h b/devices/video/control.h
index c284c44..4254cc0 100644
--- a/devices/video/control.h
+++ b/devices/video/control.h
@@ -78,6 +78,7 @@ enum {
 
 // Bit definitions for MISC_ENABLES register.
 enum {
+    SCAN_CONTROL        = 1 <<  0, // 0 - interlaced, 1 - progressive
     FB_ENDIAN_LITTLE    = 1 <<  1, // framebuffer endianness: 0 - big, 1 - little
     VRAM_WIDE_MODE      = 1 <<  6, // VRAM bus width: 1 - 128bit, 0 - 64bit
     BLANK_DISABLE       = 1 << 11, // 0 - enable blanking, 1 - disable it