diff --git a/src/vid_ati_mach64.c b/src/vid_ati_mach64.c
index 3f0ff01..8fb7802 100644
--- a/src/vid_ati_mach64.c
+++ b/src/vid_ati_mach64.c
@@ -633,17 +633,17 @@ void mach64_start_line(mach64_t *mach64)
 #define WRITE(addr, width)      if (width == 0)                                                         \
                                 {                                                                       \
                                         svga->vram[(addr) & 0x7fffff] = dest_dat;                             \
-                                        svga->changedvram[((addr) & 0x7fffff) >> 10] = changeframecount;      \
+                                        svga->changedvram[((addr) & 0x7fffff) >> 12] = changeframecount;      \
                                 }                                                                       \
                                 else if (width == 1)                                                    \
                                 {                                                                       \
                                         *(uint16_t *)&svga->vram[((addr) << 1) & 0x7fffff] = dest_dat;          \
-                                        svga->changedvram[(((addr) << 1) & 0x7fffff) >> 10] = changeframecount; \
+                                        svga->changedvram[(((addr) << 1) & 0x7fffff) >> 12] = changeframecount; \
                                 }                                                                       \
                                 else                                                                    \
                                 {                                                                       \
                                         *(uint32_t *)&svga->vram[((addr) << 2) & 0x7fffff] = dest_dat;          \
-                                        svga->changedvram[(((addr) << 2) & 0x7fffff) >> 10] = changeframecount; \
+                                        svga->changedvram[(((addr) << 2) & 0x7fffff) >> 12] = changeframecount; \
                                 }
 
 void mach64_blit(uint32_t cpu_dat, int count, mach64_t *mach64)
diff --git a/src/vid_cl5429.c b/src/vid_cl5429.c
index dc4264c..1e97404 100644
--- a/src/vid_cl5429.c
+++ b/src/vid_cl5429.c
@@ -351,14 +351,14 @@ void gd5429_write_linear(uint32_t addr, uint8_t val, void *p)
         if (addr >= svga->vram_limit)
                 return;
 //        if (svga_output) pclog("%08X\n", addr);
-        svga->changedvram[addr >> 10] = changeframecount;
+        svga->changedvram[addr >> 12] = changeframecount;
         
         switch (svga->writemode)
         {
                 case 4:
                 pclog("Writemode 4 : %X ", addr);
                 addr <<= 1;
-                svga->changedvram[addr >> 10] = changeframecount;
+                svga->changedvram[addr >> 12] = changeframecount;
                 pclog("%X %X\n", addr, val);
                 if (val & 0x80)
                         svga->vram[addr + 0] = svga->gdcreg[1];
@@ -381,7 +381,7 @@ void gd5429_write_linear(uint32_t addr, uint8_t val, void *p)
                 case 5:
                 pclog("Writemode 5 : %X ", addr);
                 addr <<= 1;
-                svga->changedvram[addr >> 10] = changeframecount;
+                svga->changedvram[addr >> 12] = changeframecount;
                 pclog("%X %X\n", addr, val);
                 svga->vram[addr + 0] = (val & 0x80) ? svga->gdcreg[1] : svga->gdcreg[0];
                 svga->vram[addr + 1] = (val & 0x40) ? svga->gdcreg[1] : svga->gdcreg[0];
@@ -618,7 +618,7 @@ void gd5429_start_blit(uint32_t cpu_dat, int count, void *p)
                         count--;                        
                 }
                 dst = svga->vram[gd5429->blt.dst_addr & svga->vrammask];
-                svga->changedvram[(gd5429->blt.dst_addr & svga->vrammask) >> 10] = changeframecount;
+                svga->changedvram[(gd5429->blt.dst_addr & svga->vrammask) >> 12] = changeframecount;
                
                 pclog("Blit %i,%i %06X %06X  %06X %02X %02X  %02X %02X ", gd5429->blt.width, gd5429->blt.height_internal, gd5429->blt.src_addr, gd5429->blt.dst_addr, gd5429->blt.src_addr & svga->vrammask, svga->vram[gd5429->blt.src_addr & svga->vrammask], 0x80 >> (gd5429->blt.dst_addr & 7), src, dst);
                 switch (gd5429->blt.rop)
diff --git a/src/vid_et4000w32.c b/src/vid_et4000w32.c
index 03adf4b..5a0d1d6 100644
--- a/src/vid_et4000w32.c
+++ b/src/vid_et4000w32.c
@@ -371,7 +371,7 @@ void et4000w32p_mmu_write(uint32_t addr, uint8_t val, void *p)
                 else
                 {
                         svga->vram[(addr & 0x1fff) + et4000->mmu.base[bank]] = val;
-                        svga->changedvram[((addr & 0x1fff) + et4000->mmu.base[bank]) >> 10] = changeframecount;
+                        svga->changedvram[((addr & 0x1fff) + et4000->mmu.base[bank]) >> 12] = changeframecount;
                 }
                 break;
                 case 0x6000:
@@ -705,7 +705,7 @@ void et4000w32_blit(int count, uint32_t mix, uint32_t sdat, int cpu_input, et400
                         if (!(et4000->acl.internal.ctrl_routing & 0x40))
                         {
                                 svga->vram[et4000->acl.dest_addr & 0x1fffff] = out;
-                                svga->changedvram[(et4000->acl.dest_addr & 0x1fffff) >> 10] = changeframecount;
+                                svga->changedvram[(et4000->acl.dest_addr & 0x1fffff) >> 12] = changeframecount;
                         }
                         else
                         {
@@ -826,7 +826,7 @@ void et4000w32_blit(int count, uint32_t mix, uint32_t sdat, int cpu_input, et400
                         if (!(et4000->acl.internal.ctrl_routing & 0x40))
                         {
                                 svga->vram[et4000->acl.dest_addr & 0x1fffff] = out;
-                                svga->changedvram[(et4000->acl.dest_addr & 0x1fffff) >> 10] = changeframecount;
+                                svga->changedvram[(et4000->acl.dest_addr & 0x1fffff) >> 12] = changeframecount;
                         }
                         else
                         {
diff --git a/src/vid_et4000w32i.c b/src/vid_et4000w32i.c
index 3570b4c..09beb91 100644
--- a/src/vid_et4000w32i.c
+++ b/src/vid_et4000w32i.c
@@ -98,7 +98,7 @@ void et4000w32_mmu_write(uint32_t addr, uint8_t val)
                 else
                 {
                         vram[(addr&0x1FFF)+mmu.base[bank]]=val;
-                        changedvram[((addr&0x1FFF)+mmu.base[bank])>>10]=changeframecount;
+                        changedvram[((addr&0x1FFF)+mmu.base[bank])>>12]=changeframecount;
                 }
                 break;
                 case 0x6000:
@@ -302,7 +302,7 @@ void et4000w32_blit(int count, uint32_t mix, uint32_t sdat, int cpu_input)
                 }
                 pclog("%06X = %02X\n",acl.dest_addr&0x1FFFFF,out);
                 vram[acl.dest_addr&0x1FFFFF]=out;
-                changedvram[(acl.dest_addr&0x1FFFFF)>>10]=changeframecount;
+                changedvram[(acl.dest_addr&0x1FFFFF)>>12]=changeframecount;
 
                 acl.pattern_x++;
                 acl.pattern_x&=et4000w32_wrap_x[acl.internal.pattern_wrap&7];
@@ -378,7 +378,7 @@ void et4000w32_blit(int count, uint32_t mix, uint32_t sdat, int cpu_input)
                                 if (acl.internal.rop_bg&(1<<d)) out|=(1<<c);
                         }
                         vram[acl.dest_addr&0x1FFFFF]=out;
-                        changedvram[(acl.dest_addr&0x1FFFFF)>>10]=changeframecount;
+                        changedvram[(acl.dest_addr&0x1FFFFF)>>12]=changeframecount;
 
                         pattern_x++;
                         pattern_x&=et4000w32_wrap_x[acl.internal.pattern_wrap&7];
diff --git a/src/vid_s3.c b/src/vid_s3.c
index 0f90835..1b9afc0 100644
--- a/src/vid_s3.c
+++ b/src/vid_s3.c
@@ -1048,17 +1048,17 @@ uint8_t s3_accel_read(uint32_t addr, void *p)
 #define WRITE(addr)     if (s3->bpp == 0)                                                                                \
                         {                                                                                               \
                                 svga->vram[(addr) & 0x3fffff] = dest_dat;                              \
-                                svga->changedvram[((addr) & 0x3fffff) >> 10] = changeframecount;       \
+                                svga->changedvram[((addr) & 0x3fffff) >> 12] = changeframecount;       \
                         }                                                                                               \
                         else if (s3->bpp == 1)                                                                           \
                         {                                                                                               \
                                 vram_w[(addr) & 0x1fffff] = dest_dat;                            \
-                                svga->changedvram[((addr) & 0x1fffff) >> 9] = changeframecount;        \
+                                svga->changedvram[((addr) & 0x1fffff) >> 11] = changeframecount;        \
                         }                                                                                               \
                         else                                                                                            \
                         {                                                                                               \
                                 vram_l[(addr) & 0xfffff] = dest_dat;                             \
-                                svga->changedvram[((addr) & 0xfffff) >> 8] = changeframecount;         \
+                                svga->changedvram[((addr) & 0xfffff) >> 10] = changeframecount;         \
                         }
 
 void s3_accel_start(int count, int cpu_input, uint32_t mix_dat, uint32_t cpu_dat, s3_t *s3)
diff --git a/src/vid_s3_virge.c b/src/vid_s3_virge.c
index 5492467..71d7a2b 100644
--- a/src/vid_s3_virge.c
+++ b/src/vid_s3_virge.c
@@ -989,16 +989,16 @@ static void s3_virge_mmio_write_l(uint32_t addr, uint32_t val, void *p)
                 {                                                                               \
                         case 0: /*8 bpp*/                                                       \
                         vram[addr & 0x3fffff] = val;                                            \
-                        virge->svga.changedvram[(addr & 0x3fffff) >> 10] = changeframecount;    \
+                        virge->svga.changedvram[(addr & 0x3fffff) >> 12] = changeframecount;    \
                         break;                                                                  \
                         case 1: /*16 bpp*/                                                      \
                         *(uint16_t *)&vram[addr & 0x3fffff] = val;                              \
-                        virge->svga.changedvram[(addr & 0x3fffff) >> 10] = changeframecount;    \
+                        virge->svga.changedvram[(addr & 0x3fffff) >> 12] = changeframecount;    \
                         break;                                                                  \
                         case 2: /*24 bpp*/                                                      \
                         *(uint32_t *)&vram[addr & 0x3fffff] = (val & 0xffffff) |                \
                                                               (vram[(addr + 3) & 0x3fffff] << 24);  \
-                        virge->svga.changedvram[(addr & 0x3fffff) >> 10] = changeframecount;    \
+                        virge->svga.changedvram[(addr & 0x3fffff) >> 12] = changeframecount;    \
                         break;                                                                  \
                 }                                                                               \
         } while (0)
diff --git a/src/vid_svga.c b/src/vid_svga.c
index 85ae6d3..9a13efc 100644
--- a/src/vid_svga.c
+++ b/src/vid_svga.c
@@ -415,7 +415,7 @@ void svga_poll(void *p)
                                 svga->firstline = svga->displine;
                         
                         if (svga->hwcursor_on) 
-                                svga->changedvram[svga->ma >> 10] = svga->changedvram[(svga->ma >> 10) + 1] = 2;
+                                svga->changedvram[svga->ma >> 12] = svga->changedvram[(svga->ma >> 12) + 1] = 2;
                         
                         svga->render(svga);
                         
@@ -503,7 +503,7 @@ void svga_poll(void *p)
                                 svga->fullchange = 2;
                         svga->blink++;
 
-                        for (x = 0; x < (svga->vram_limit >> 10); x++) 
+                        for (x = 0; x < (svga->vram_limit >> 12); x++) 
                         {
                                 if (svga->changedvram[x]) 
                                         svga->changedvram[x]--;
@@ -634,7 +634,7 @@ int svga_init(svga_t *svga, void *p, int memsize,
         svga->vram = malloc(memsize);
         svga->vram_limit = memsize;
         svga->vrammask = memsize - 1;
-        svga->changedvram = malloc(/*(memsize >> 10) << 1*/0x800000 >> 10);
+        svga->changedvram = malloc(/*(memsize >> 12) << 1*/0x800000 >> 12);
         svga->recalctimings_ex = recalctimings_ex;
         svga->video_in  = video_in;
         svga->video_out = video_out;
@@ -687,7 +687,7 @@ void svga_write(uint32_t addr, uint8_t val, void *p)
                 return;
 
         if (svga_output) pclog("%08X (%i, %i) %02X %i %i %i %02X\n", addr, addr & 1023, addr >> 10, val, writemask2, svga->writemode, svga->chain4, svga->gdcreg[8]);
-        svga->changedvram[addr >> 10] = changeframecount;
+        svga->changedvram[addr >> 12] = changeframecount;
 
         switch (svga->writemode)
         {
@@ -913,7 +913,7 @@ void svga_write_linear(uint32_t addr, uint8_t val, void *p)
         if (addr >= svga->vram_limit)
                 return;
         if (svga_output) pclog("%08X\n", addr);
-        svga->changedvram[addr>>10]=changeframecount;
+        svga->changedvram[addr >> 12]=changeframecount;
         
         switch (svga->writemode)
         {
@@ -1161,7 +1161,7 @@ void svga_writew(uint32_t addr, uint16_t val, void *p)
         if (addr >= svga->vram_limit)
                 return;
         if (svga_output) pclog("%08X (%i, %i) %04X\n", addr, addr & 1023, addr >> 10, val);
-        svga->changedvram[addr >> 10] = changeframecount;
+        svga->changedvram[addr >> 12] = changeframecount;
         *(uint16_t *)&svga->vram[addr] = val;
 }
 
@@ -1190,7 +1190,7 @@ void svga_writel(uint32_t addr, uint32_t val, void *p)
                 return;
         if (svga_output) pclog("%08X (%i, %i) %08X\n", addr, addr & 1023, addr >> 10, val);
         
-        svga->changedvram[addr >> 10] = changeframecount;
+        svga->changedvram[addr >> 12] = changeframecount;
         *(uint32_t *)&svga->vram[addr] = val;
 }
 
@@ -1256,7 +1256,7 @@ void svga_writew_linear(uint32_t addr, uint16_t val, void *p)
         addr &= 0x7FFFFF;
         if (addr >= svga->vram_limit)
                 return;
-        svga->changedvram[addr >> 10] = changeframecount;
+        svga->changedvram[addr >> 12] = changeframecount;
         *(uint16_t *)&svga->vram[addr] = val;
 }
 
@@ -1282,7 +1282,7 @@ void svga_writel_linear(uint32_t addr, uint32_t val, void *p)
         addr &= 0x7fffff;
         if (addr >= svga->vram_limit)
                 return;
-        svga->changedvram[addr >> 10] = changeframecount;
+        svga->changedvram[addr >> 12] = changeframecount;
         *(uint32_t *)&svga->vram[addr] = val;
 }
 
diff --git a/src/vid_svga_render.c b/src/vid_svga_render.c
index 19850f3..4f93336 100644
--- a/src/vid_svga_render.c
+++ b/src/vid_svga_render.c
@@ -163,9 +163,9 @@ void svga_render_2bpp_lowres(svga_t *svga)
         int changed_offset;
         
         if (svga->sc & 1 && !(svga->crtc[0x17] & 1))
-                changed_offset = (svga->ma << 1) >> 10;
+                changed_offset = (svga->ma << 1) >> 12;
         else
-                changed_offset = ((svga->ma << 1) + 0x8000) >> 10;
+                changed_offset = ((svga->ma << 1) + 0x8000) >> 12;
                 
         if (svga->changedvram[changed_offset] || svga->changedvram[changed_offset + 1] || svga->fullchange)
         {
@@ -213,9 +213,9 @@ void svga_render_2bpp_highres(svga_t *svga)
         int changed_offset;
         
         if (svga->sc & 1 && !(svga->crtc[0x17] & 1))
-                changed_offset = ((svga->ma << 1) | 0x8000) >> 10;
+                changed_offset = ((svga->ma << 1) | 0x8000) >> 12;
         else
-                changed_offset = (svga->ma << 1) >> 10;
+                changed_offset = (svga->ma << 1) >> 12;
                                 
         if (svga->changedvram[changed_offset] || svga->changedvram[changed_offset + 1] || svga->fullchange)
         {
@@ -260,7 +260,7 @@ void svga_render_2bpp_highres(svga_t *svga)
 
 void svga_render_4bpp_lowres(svga_t *svga)
 {
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 int x;
                 int offset = ((8 - svga->scrollcache) << 1) + 16;
@@ -302,11 +302,11 @@ void svga_render_4bpp_highres(svga_t *svga)
         int changed_offset;
         
         if (svga->sc & 1 && !(svga->crtc[0x17] & 1))
-                changed_offset = (svga->ma | 0x8000) >> 10;
+                changed_offset = (svga->ma | 0x8000) >> 12;
         else
-                changed_offset = svga->ma >> 10;
+                changed_offset = svga->ma >> 12;
                 
-        if (svga->changedvram[changed_offset] || svga->changedvram[changed_offset + 1] || svga->changedvram[changed_offset + 2] || svga->fullchange)
+        if (svga->changedvram[changed_offset] || svga->changedvram[changed_offset + 1] || svga->fullchange)
         {
                 int x;
                 int offset = (8 - svga->scrollcache) + 24;
@@ -348,7 +348,7 @@ void svga_render_4bpp_highres(svga_t *svga)
 
 void svga_render_8bpp_lowres(svga_t *svga)
 {
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 int x;
                 int offset = (8 - (svga->scrollcache & 6)) + 24;
@@ -376,7 +376,7 @@ void svga_render_8bpp_lowres(svga_t *svga)
 
 void svga_render_8bpp_highres(svga_t *svga)
 {
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 int x;
                 int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
@@ -410,7 +410,7 @@ void svga_render_8bpp_highres(svga_t *svga)
 
 void svga_render_15bpp_lowres(svga_t *svga)
 {
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 int x;
                 int offset = (8 - (svga->scrollcache & 6)) + 24;
@@ -439,7 +439,7 @@ void svga_render_15bpp_lowres(svga_t *svga)
 
 void svga_render_15bpp_highres(svga_t *svga)
 {
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 int x;
                 int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
@@ -474,7 +474,7 @@ void svga_render_15bpp_highres(svga_t *svga)
 
 void svga_render_16bpp_lowres(svga_t *svga)
 {
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 int x;
                 int offset = (8 - (svga->scrollcache & 6)) + 24;
@@ -503,7 +503,7 @@ void svga_render_16bpp_lowres(svga_t *svga)
 
 void svga_render_16bpp_highres(svga_t *svga)
 {
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 int x;
                 int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
@@ -541,7 +541,7 @@ void svga_render_24bpp_lowres(svga_t *svga)
         int x, offset;
         uint32_t fg;
         
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 if (svga->firstline_draw == 2000) 
                         svga->firstline_draw = svga->displine;
@@ -561,7 +561,7 @@ void svga_render_24bpp_lowres(svga_t *svga)
 
 void svga_render_24bpp_highres(svga_t *svga)
 {
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 int x;
                 int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
@@ -596,7 +596,7 @@ void svga_render_32bpp_lowres(svga_t *svga)
         int x, offset;
         uint32_t fg;
         
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] || svga->changedvram[(svga->ma >> 12) + 1] || svga->fullchange)
         {
                 if (svga->firstline_draw == 2000) 
                         svga->firstline_draw = svga->displine;
@@ -618,7 +618,7 @@ void svga_render_32bpp_lowres(svga_t *svga)
   91%*/
 void svga_render_32bpp_highres(svga_t *svga)
 {
-        if (svga->changedvram[svga->ma >> 10] || svga->changedvram[(svga->ma >> 10) + 1] || svga->changedvram[(svga->ma >> 10) + 2] || svga->fullchange)
+        if (svga->changedvram[svga->ma >> 12] ||  svga->changedvram[(svga->ma >> 12) + 1] || svga->changedvram[(svga->ma >> 12) + 2] || svga->fullchange)
         {
                 int x;
                 int offset = (8 - ((svga->scrollcache & 6) >> 1)) + 24;
diff --git a/src/vid_tgui9440.c b/src/vid_tgui9440.c
index 1aeba17..545235f 100644
--- a/src/vid_tgui9440.c
+++ b/src/vid_tgui9440.c
@@ -552,12 +552,12 @@ enum
 #define WRITE(addr, dat)        if (tgui->accel.bpp == 0)                                                \
                                 {                                                                       \
                                         svga->vram[addr & 0x1fffff] = dat;                                    \
-                                        svga->changedvram[((addr) & 0x1fffff) >> 10] = changeframecount;      \
+                                        svga->changedvram[((addr) & 0x1fffff) >> 12] = changeframecount;      \
                                 }                                                                       \
                                 else                                                                    \
                                 {                                                                       \
                                         vram_w[addr & 0xfffff] = dat;                                   \
-                                        svga->changedvram[((addr) & 0xfffff) >> 9] = changeframecount;        \
+                                        svga->changedvram[((addr) & 0xfffff) >> 11] = changeframecount;        \
                                 }
                                 
 void tgui_accel_write_fb_b(uint32_t addr, uint8_t val, void *priv);