diff --git a/src/vid_ati18800.c b/src/vid_ati18800.c
index 0af89fb..8abb6c8 100644
--- a/src/vid_ati18800.c
+++ b/src/vid_ati18800.c
@@ -60,7 +60,10 @@ void ati18800_out(uint16_t addr, uint8_t val, void *p)
                 svga->crtcreg = val & 0x3f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 old = svga->crtc[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
                 if (old != val)
diff --git a/src/vid_ati28800.c b/src/vid_ati28800.c
index fc033f8..b29de3e 100644
--- a/src/vid_ati28800.c
+++ b/src/vid_ati28800.c
@@ -62,7 +62,10 @@ void ati28800_out(uint16_t addr, uint8_t val, void *p)
                 svga->crtcreg = val & 0x3f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 old = svga->crtc[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
                 if (old != val)
diff --git a/src/vid_ati_mach64.c b/src/vid_ati_mach64.c
index 45700c2..7011ad8 100644
--- a/src/vid_ati_mach64.c
+++ b/src/vid_ati_mach64.c
@@ -245,7 +245,10 @@ void mach64_out(uint16_t addr, uint8_t val, void *p)
                 svga->crtcreg = val & 0x1f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 if (svga->crtcreg > 0x18)
                         return;
                 old = svga->crtc[svga->crtcreg];
diff --git a/src/vid_cl5429.c b/src/vid_cl5429.c
index 0302377..59f2434 100644
--- a/src/vid_cl5429.c
+++ b/src/vid_cl5429.c
@@ -141,7 +141,10 @@ void gd5429_out(uint16_t addr, uint8_t val, void *p)
                 svga->crtcreg = val & 0x3f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 old = svga->crtc[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
 
diff --git a/src/vid_et4000.c b/src/vid_et4000.c
index 67701a6..db8438e 100644
--- a/src/vid_et4000.c
+++ b/src/vid_et4000.c
@@ -61,7 +61,10 @@ void et4000_out(uint16_t addr, uint8_t val, void *p)
                 svga->crtcreg = val & 0x3f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 old = svga->crtc[svga->crtcreg];
                 val &= crtc_mask[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
diff --git a/src/vid_et4000w32.c b/src/vid_et4000w32.c
index 831a76b..8b5e5f3 100644
--- a/src/vid_et4000w32.c
+++ b/src/vid_et4000w32.c
@@ -127,7 +127,10 @@ void et4000w32p_out(uint16_t addr, uint8_t val, void *p)
                 return;
                 case 0x3D5:
 //                pclog("Write CRTC R%02X %02X\n", crtcreg, val);
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 old = svga->crtc[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
                 if (old != val)
diff --git a/src/vid_oti067.c b/src/vid_oti067.c
index be8f84e..ec036fa 100644
--- a/src/vid_oti067.c
+++ b/src/vid_oti067.c
@@ -38,7 +38,10 @@ void oti067_out(uint16_t addr, uint8_t val, void *p)
                 svga->crtcreg = val & 31;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 old = svga->crtc[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
                 if (old != val)
diff --git a/src/vid_paradise.c b/src/vid_paradise.c
index 9f6f99b..dd5d2e6 100644
--- a/src/vid_paradise.c
+++ b/src/vid_paradise.c
@@ -114,8 +114,10 @@ void paradise_out(uint16_t addr, uint8_t val, void *p)
                    svga->crtcreg = val & 0x3f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) 
-                   return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 if (svga->crtcreg > 0x29 && (svga->crtc[0x29] & 7) != 5)
                    return;
                 if (svga->crtcreg >= 0x31 && svga->crtcreg <= 0x37)
diff --git a/src/vid_s3.c b/src/vid_s3.c
index 0c4d2f3..c7da015 100644
--- a/src/vid_s3.c
+++ b/src/vid_s3.c
@@ -141,7 +141,10 @@ void s3_out(uint16_t addr, uint8_t val, void *p)
                 svga->crtcreg = val & 0x7f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 if (svga->crtcreg >= 0x20 && svga->crtcreg != 0x38 && (svga->crtc[0x38] & 0xcc) != 0x48) return;
                 old = svga->crtc[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
diff --git a/src/vid_s3_virge.c b/src/vid_s3_virge.c
index 5dc03ec..88fc257 100644
--- a/src/vid_s3_virge.c
+++ b/src/vid_s3_virge.c
@@ -277,8 +277,10 @@ static void s3_virge_out(uint16_t addr, uint8_t val, void *p)
                 return;
                 case 0x3d5:
                 //pclog("Write CRTC R%02X %02X  %04x(%08x):%08x\n", svga->crtcreg, val, CS, cs, pc);
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) 
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
                         return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 if (svga->crtcreg >= 0x20 && svga->crtcreg != 0x38 && (svga->crtc[0x38] & 0xcc) != 0x48) 
                         return;
                 if (svga->crtcreg >= 0x80)
diff --git a/src/vid_tgui9440.c b/src/vid_tgui9440.c
index 526b622..eba1a01 100644
--- a/src/vid_tgui9440.c
+++ b/src/vid_tgui9440.c
@@ -161,7 +161,10 @@ void tgui_out(uint16_t addr, uint8_t val, void *p)
 		svga->crtcreg = val & 0x7f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 old = svga->crtc[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
 //                if (svga->crtcreg != 0xE && svga->crtcreg != 0xF) pclog("CRTC R%02X = %02X\n", svga->crtcreg, val);
diff --git a/src/vid_tvga.c b/src/vid_tvga.c
index 442b436..a9388b0 100644
--- a/src/vid_tvga.c
+++ b/src/vid_tvga.c
@@ -110,7 +110,10 @@ void tvga_out(uint16_t addr, uint8_t val, void *p)
 		svga->crtcreg = val & 0x3f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 old = svga->crtc[svga->crtcreg];
                 val &= crtc_mask[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
diff --git a/src/vid_vga.c b/src/vid_vga.c
index fb2a4b1..16cc70b 100644
--- a/src/vid_vga.c
+++ b/src/vid_vga.c
@@ -33,7 +33,10 @@ void vga_out(uint16_t addr, uint8_t val, void *p)
                 svga->crtcreg = val & 0x1f;
                 return;
                 case 0x3D5:
-                if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
                 old = svga->crtc[svga->crtcreg];
                 svga->crtc[svga->crtcreg] = val;
                 if (old != val)