diff --git a/hw/pc.h b/hw/pc.h
index e4db071..37e2f87 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -176,6 +176,10 @@
 
 extern enum vga_retrace_method vga_retrace_method;
 
+#define VGA_CGA_HACK_PALETTE_BLANKING  (1<<0)
+#define VGA_CGA_HACK_FONT_HEIGHT       (1<<1)
+extern int vga_cga_hacks;
+
 static inline DeviceState *isa_vga_init(ISABus *bus)
 {
     ISADevice *dev;
diff --git a/hw/vga.c b/hw/vga.c
index f82ced8..a65fc26 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -547,14 +547,31 @@
         printf("vga: write CR%x = 0x%02x\n", s->cr_index, val);
 #endif
         /* handle CR0-7 protection */
-        if ((s->cr[VGA_CRTC_V_SYNC_END] & VGA_CR11_LOCK_CR0_CR7) &&
-            s->cr_index <= VGA_CRTC_OVERFLOW) {
-            /* can always write bit 4 of CR7 */
-            if (s->cr_index == VGA_CRTC_OVERFLOW) {
-                s->cr[VGA_CRTC_OVERFLOW] = (s->cr[VGA_CRTC_OVERFLOW] & ~0x10) |
-                    (val & 0x10);
+        if (s->cr[VGA_CRTC_V_SYNC_END] & VGA_CR11_LOCK_CR0_CR7) {
+            if (s->cr_index <= VGA_CRTC_OVERFLOW) {
+                /* can always write bit 4 of CR7 */
+                if (s->cr_index == VGA_CRTC_OVERFLOW) {
+                    s->cr[VGA_CRTC_OVERFLOW] =
+                        (s->cr[VGA_CRTC_OVERFLOW] & ~0x10) | (val & 0x10);
+                }
+                return;
+            } else if ((vga_cga_hacks & VGA_CGA_HACK_FONT_HEIGHT) &&
+                       !(s->sr[VGA_SEQ_CLOCK_MODE] & VGA_SR01_CHAR_CLK_8DOTS)) {
+                /* extra CGA compatibility hacks (not in standard VGA) */
+                if (s->cr_index == VGA_CRTC_MAX_SCAN &&
+                    val == 7 &&
+                    (s->cr[VGA_CRTC_MAX_SCAN] & 0xf) == 0xf) {
+                    return;
+                } else if (s->cr_index == VGA_CRTC_CURSOR_START &&
+                           val == 6 &&
+                           (s->cr[VGA_CRTC_MAX_SCAN] & 0xf) == 0xf) {
+                    val = 0xd;
+                } else if (s->cr_index == VGA_CRTC_CURSOR_END &&
+                           val == 7 &&
+                           (s->cr[VGA_CRTC_MAX_SCAN] & 0xf) == 0xf) {
+                    val = 0xe;
+                }
             }
-            return;
         }
         s->cr[s->cr_index] = val;
 
@@ -1886,7 +1903,10 @@
         /* nothing to do */
     } else {
         full_update = 0;
-        if (!(s->ar_index & 0x20)) {
+        if (!(s->ar_index & 0x20) &&
+            /* extra CGA compatibility hacks (not in standard VGA */
+            (!(vga_cga_hacks & VGA_CGA_HACK_PALETTE_BLANKING) ||
+             (s->ar_index != 0 && s->ar_flip_flop))) {
             graphic_mode = GMODE_BLANK;
         } else {
             graphic_mode = s->gr[VGA_GFX_MISC] & VGA_GR06_GRAPHICS_MODE;
diff --git a/qemu-options.hx b/qemu-options.hx
index 3e8085d..0682338 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -975,6 +975,25 @@
 @item retrace=dumb|precise
 Select dumb (default) or precise VGA retrace logic, useful for some
 DOS games/demos.
+@item cga_hacks=@var{hack1}[+@var{hack2},[...]]
+Enable various extra CGA compatibility hacks for programs that are
+trying to directly set CGA modes without BIOS assistance nor
+real knowledge of EGA/VGA.  These might only work with -vga std.
+Valid hacks are
+@table @option
+@item palette_blanking
+Wait to blank the screen until palette registers seem to actually be
+modified, instead of blanking it as soon as the palette address bit (0x10)
+of the attribute address register (0x3c0) is cleared.
+@item font_height
+Ignore attempts to change the VGA font height (index 9),
+cursor start (index 10), and cursor end (index 11) of the CRTC control
+registers (0x3d5) if trying to set them to the default for CGA fonts
+instead of VGA fonts.
+@item all
+Enable all CGA hacks.  More CGA hacks may be added in future versions
+of qemu.
+@end table
 @end table
 ETEXI
 
diff --git a/vl.c b/vl.c
index febfd62..16d04a2 100644
--- a/vl.c
+++ b/vl.c
@@ -179,6 +179,7 @@
 static const char *data_dir;
 const char *bios_name = NULL;
 enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
+int vga_cga_hacks = 0;
 DisplayType display_type = DT_DEFAULT;
 int display_remote = 0;
 const char* keyboard_layout = NULL;
@@ -1748,6 +1749,28 @@
             else if (strstart(opts, "precise", &nextopt))
                 vga_retrace_method = VGA_RETRACE_PRECISE;
             else goto invalid_vga;
+        } else if (strstart(opts, ",cga_hacks=", &nextopt)) {
+            opts = nextopt;
+            while (*opts) {
+                if (strstart(opts, "all", &nextopt)) {
+                    opts = nextopt;
+                    vga_cga_hacks |= ~0;
+                } else if (strstart(opts, "palette_blanking", &nextopt)) {
+                    opts = nextopt;
+                    vga_cga_hacks |= VGA_CGA_HACK_PALETTE_BLANKING;
+                } else if (strstart(opts, "font_height", &nextopt)) {
+                    opts = nextopt;
+                    vga_cga_hacks |= VGA_CGA_HACK_FONT_HEIGHT;
+                } else {
+                    break;
+                }
+
+                if (*opts == '+') {
+                    opts++;
+                } else {
+                    break;
+                }
+            }
         } else goto invalid_vga;
         opts = nextopt;
     }