diff --git a/src/video/vid_8514a.c b/src/video/vid_8514a.c
index 3505d1e0b..a94b974b0 100644
--- a/src/video/vid_8514a.c
+++ b/src/video/vid_8514a.c
@@ -914,7 +914,7 @@ ibm8514_accel_out(uint16_t port, uint32_t val, svga_t *svga, int len)
                 if (!(port & 1)) {
                     if (((dev->disp_cntl & 0x60) == 0x20) || (((dev->disp_cntl & 0x60) == 0x40) && !(dev->accel.advfunc_cntl & 0x04))) {
                         dev->hsync_start = val;
-                        dev->hblankstart = (dev->hsync_start & 0x07) + 1;
+                        dev->hblankstart = (dev->hsync_start & 0x07);
                     }
                 }
                 ibm8514_log("IBM 8514/A: H_SYNC_STRT write 0AE8 = %d\n", val + 1);
diff --git a/src/video/vid_ati28800.c b/src/video/vid_ati28800.c
index be9654aca..368312fcb 100644
--- a/src/video/vid_ati28800.c
+++ b/src/video/vid_ati28800.c
@@ -408,7 +408,7 @@ ati28800_recalctimings(svga_t *svga)
     int               clock_sel;
 
     if (ati28800->regs[0xad] & 0x08)
-        svga->hblankstart    = ((ati28800->regs[0x0d] >> 2) << 8) + svga->crtc[2] + 1;
+        svga->hblankstart    = ((ati28800->regs[0x0d] >> 2) << 8) + svga->crtc[2];
 
     clock_sel = ((svga->miscout >> 2) & 3) | ((ati28800->regs[0xbe] & 0x10) >> 1) |
                 ((ati28800->regs[0xb9] & 2) << 1);
@@ -492,8 +492,7 @@ ati28800_recalctimings(svga_t *svga)
                             else {
                                 svga->render = svga_render_15bpp_highres;
                                 svga->hdisp >>= 1;
-                                svga->hblankstart = ((svga->hblankstart - 1) >> 1) + 1;
-                                svga->hblank_end_val >>= 1;
+                                svga->dots_per_clock >>= 1;
                                 svga->rowoffset <<= 1;
                                 svga->ma_latch <<= 1;
                             }
diff --git a/src/video/vid_ati_mach64.c b/src/video/vid_ati_mach64.c
index cdd906067..9aa396383 100644
--- a/src/video/vid_ati_mach64.c
+++ b/src/video/vid_ati_mach64.c
@@ -516,7 +516,7 @@ mach64_recalctimings(svga_t *svga)
         svga->htotal     = (mach64->crtc_h_total_disp & 255) + 1;
         svga->hdisp_time = svga->hdisp = ((mach64->crtc_h_total_disp >> 16) & 255) + 1;
         svga->hblankstart              = (mach64->crtc_h_sync_strt_wid & 255) +
-                                         ((mach64->crtc_h_sync_strt_wid >> 8) & 7) + 1;
+                                         ((mach64->crtc_h_sync_strt_wid >> 8) & 7);
         svga->hblank_end_val           = (svga->hblankstart +
                                          ((mach64->crtc_h_sync_strt_wid >> 16) & 31) - 1) & 63;
         svga->vsyncstart               = (mach64->crtc_v_sync_strt_wid & 2047) + 1;
diff --git a/src/video/vid_ati_mach8.c b/src/video/vid_ati_mach8.c
index 5628e149a..b49806177 100644
--- a/src/video/vid_ati_mach8.c
+++ b/src/video/vid_ati_mach8.c
@@ -2547,7 +2547,7 @@ mach_recalctimings(svga_t *svga)
     int           clock_sel;
 
     if (mach->regs[0xad] & 0x08)
-        svga->hblankstart    = ((mach->regs[0x0d] >> 2) << 8) + svga->crtc[2] + 1;
+        svga->hblankstart    = ((mach->regs[0x0d] >> 2) << 8) + svga->crtc[2];
 
     clock_sel = ((svga->miscout >> 2) & 3) | ((mach->regs[0xbe] & 0x10) >> 1) | ((mach->regs[0xb9] & 2) << 1);
 
@@ -3636,7 +3636,7 @@ mach_accel_out_call(uint16_t port, uint8_t val, mach_t *mach, svga_t *svga, ibm8
             if (!(port & 1)) {
                 if (((dev->disp_cntl & 0x60) == 0x20) || (((dev->disp_cntl & 0x60) == 0x40) && !(dev->accel.advfunc_cntl & 0x04)) || (mach->accel.clock_sel & 0x01)) {
                     dev->hsync_start = val;
-                    dev->hblankstart = (dev->hsync_start & 0x07) + 1;
+                    dev->hblankstart = (dev->hsync_start & 0x07);
                 }
             }
             mach_log("ATI 8514/A: H_SYNC_STRT write 0AE8 = %d\n", val + 1);
diff --git a/src/video/vid_chips_69000.c b/src/video/vid_chips_69000.c
index 9e5e74370..04a543884 100644
--- a/src/video/vid_chips_69000.c
+++ b/src/video/vid_chips_69000.c
@@ -1886,10 +1886,10 @@ chips_69000_pci_write(int func, int addr, uint8_t val, void *p)
                 }
             case 0x13:
                 {
-                    if (!(chips->pci_conf_status & PCI_COMMAND_MEM)) {
+                    // if (!(chips->pci_conf_status & PCI_COMMAND_MEM)) {
                         chips->linear_mapping.base = val << 24;
-                        break;
-                    }
+                        // break;
+                    // }
                     mem_mapping_set_addr(&chips->linear_mapping, val << 24, (1 << 24));
                     break;
                 }
diff --git a/src/video/vid_cl54xx.c b/src/video/vid_cl54xx.c
index 5d376effe..e83d4593f 100644
--- a/src/video/vid_cl54xx.c
+++ b/src/video/vid_cl54xx.c
@@ -1750,7 +1750,7 @@ gd54xx_recalctimings(svga_t *svga)
     uint8_t         rdmask;
     uint8_t         linedbl = svga->dispend * 9 / 10 >= svga->hdisp;
 
-    svga->hblankstart = svga->crtc[2] + 1;
+    svga->hblankstart = svga->crtc[2];
 
     if (svga->crtc[0x1b] & ((svga->crtc[0x27] >= CIRRUS_ID_CLGD5424) ? 0xa0 : 0x20)) {
         /* Special blanking mode: the blank start and end become components of the window generator,
@@ -1763,7 +1763,7 @@ gd54xx_recalctimings(svga_t *svga)
         svga->hblank_end_mask = 0x000000ff;
 
         if (svga->crtc[0x1b] & 0x20) {
-            svga->hblankstart = svga->crtc[1]/* + ((svga->crtc[3] >> 5) & 3)*/ + 1;
+            svga->hblankstart = svga->crtc[1]/* + ((svga->crtc[3] >> 5) & 3) + 1*/;
             svga->hblank_end_val = svga->htotal - 1 /* + ((svga->crtc[3] >> 5) & 3)*/;
 
             /* In this mode, the dots per clock are always 8 or 16, never 9 or 18. */
diff --git a/src/video/vid_et4000.c b/src/video/vid_et4000.c
index 6d52fc91b..fa671e2f6 100644
--- a/src/video/vid_et4000.c
+++ b/src/video/vid_et4000.c
@@ -650,7 +650,7 @@ et4000_recalctimings(svga_t *svga)
 
     svga->ma_latch |= (svga->crtc[0x33] & 3) << 16;
 
-    svga->hblankstart    = (((svga->crtc[0x3f] & 0x10) >> 4) << 8) + svga->crtc[2] + 1;
+    svga->hblankstart    = (((svga->crtc[0x3f] & 0x10) >> 4) << 8) + svga->crtc[2];
 
     if (svga->crtc[0x35] & 1)
         svga->vblankstart += 0x400;
@@ -690,14 +690,12 @@ et4000_recalctimings(svga_t *svga)
         case 15:
         case 16:
             svga->hdisp /= 2;
-            svga->hblankstart /= 2;
-            svga->hblank_end_val /= 2;
+            svga->dots_per_clock /= 2;
             break;
 
         case 24:
             svga->hdisp /= 3;
-            svga->hblankstart /= 3;
-            svga->hblank_end_val /= 3;
+            svga->dots_per_clock /= 3;
             break;
 
         default:
diff --git a/src/video/vid_et4000w32.c b/src/video/vid_et4000w32.c
index 259fefffb..7adb6bc89 100644
--- a/src/video/vid_et4000w32.c
+++ b/src/video/vid_et4000w32.c
@@ -432,7 +432,7 @@ et4000w32p_recalctimings(svga_t *svga)
 
     svga->ma_latch |= (svga->crtc[0x33] & 0x7) << 16;
 
-    svga->hblankstart    = (((svga->crtc[0x3f] & 0x10) >> 4) << 8) + svga->crtc[2] + 1;
+    svga->hblankstart    = (((svga->crtc[0x3f] & 0x10) >> 4) << 8) + svga->crtc[2];
 
     if (svga->crtc[0x35] & 0x01)
         svga->vblankstart += 0x400;
diff --git a/src/video/vid_ht216.c b/src/video/vid_ht216.c
index 35d335ed2..b87d93665 100644
--- a/src/video/vid_ht216.c
+++ b/src/video/vid_ht216.c
@@ -714,7 +714,7 @@ ht216_recalctimings(svga_t *svga)
         svga->vram_display_mask = (ht216->ht_regs[0xf6] & 0x40) ? ht216->vram_mask : 0x3ffff;
 
     if (ht216->ht_regs[0xe0] & 0x20)
-        svga->hblankstart    = ((ht216->ht_regs[0xca] >> 2) << 8) + svga->crtc[4] + 1;
+        svga->hblankstart    = ((ht216->ht_regs[0xca] >> 2) << 8) + svga->crtc[4];
 }
 
 static void
diff --git a/src/video/vid_mga.c b/src/video/vid_mga.c
index b85eb5ad9..f40385fef 100644
--- a/src/video/vid_mga.c
+++ b/src/video/vid_mga.c
@@ -945,7 +945,7 @@ mystique_recalctimings(svga_t *svga)
     if (mystique->crtcext_regs[1] & CRTCX_R1_HTOTAL8)
         svga->htotal |= 0x100;
 
-    svga->hblankstart    = (((mystique->crtcext_regs[1] & 0x02) >> 2) << 8) + svga->crtc[2] + 1;
+    svga->hblankstart    = (((mystique->crtcext_regs[1] & 0x02) >> 2) << 8) + svga->crtc[2];
 
     if (mystique->crtcext_regs[2] & CRTCX_R2_VTOTAL10)
         svga->vtotal |= 0x400;
diff --git a/src/video/vid_s3.c b/src/video/vid_s3.c
index 41e21faa9..27c364898 100644
--- a/src/video/vid_s3.c
+++ b/src/video/vid_s3.c
@@ -3312,7 +3312,7 @@ s3_recalctimings(svga_t *svga)
     if (svga->crtc[0x33] & 0x20) {
         /* The S3 version of the Cirrus' special blanking mode, with identical behavior. */
         svga->hblankstart = (((svga->crtc[0x5d] & 0x02) >> 1) << 8) + svga->crtc[1]/* +
-                            ((svga->crtc[3] >> 5) & 3)*/ + 1;
+                            ((svga->crtc[3] >> 5) & 3) + 1*/;
         svga->hblank_end_val = svga->htotal - 1 /* + ((svga->crtc[3] >> 5) & 3)*/;
 
         svga->monitor->mon_overscan_y = 0;
@@ -3324,7 +3324,7 @@ s3_recalctimings(svga_t *svga)
         if (s3->chip >= S3_VISION964)
             svga->hblank_end_mask  = 0x7f;
     } else if (s3->chip >= S3_86C801) {
-        svga->hblankstart    = (((svga->crtc[0x5d] & 0x04) >> 2) << 8) + svga->crtc[2] + 1;
+        svga->hblankstart    = (((svga->crtc[0x5d] & 0x04) >> 2) << 8) + svga->crtc[2];
 
         if (s3->chip >= S3_VISION964) {
             /* NOTE: The S3 Trio64V+ datasheet says this is bit 7, but then where is bit 6?
@@ -4160,7 +4160,7 @@ s3_trio64v_recalctimings(svga_t *svga)
     if ((svga->crtc[0x33] & 0x20) || ((svga->crtc[0x67] & 0xc) == 0xc)) {
         /* The S3 version of the Cirrus' special blanking mode, with identical behavior. */
         svga->hblankstart = (((svga->crtc[0x5d] & 0x02) >> 1) << 8) + svga->crtc[1]/* +
-                            ((svga->crtc[3] >> 5) & 3)*/ + 1;
+                            ((svga->crtc[3] >> 5) & 3) + 1*/;
         svga->hblank_end_val = svga->htotal - 1 /* + ((svga->crtc[3] >> 5) & 3)*/;
 
         svga->monitor->mon_overscan_y = 0;
@@ -4169,7 +4169,7 @@ s3_trio64v_recalctimings(svga_t *svga)
         /* Also make sure vertical blanking starts on display end. */
         svga->vblankstart = svga->dispend;
     } else {
-        svga->hblankstart    = (((svga->crtc[0x5d] & 0x04) >> 2) << 8) + svga->crtc[2] + 1;
+        svga->hblankstart    = (((svga->crtc[0x5d] & 0x04) >> 2) << 8) + svga->crtc[2];
 
         /* NOTE: The S3 Trio64V+ datasheet says this is bit 7, but then where is bit 6?
                  The datasheets for the pre-Trio64V+ cards say +64, which implies bit 6,
diff --git a/src/video/vid_s3_virge.c b/src/video/vid_s3_virge.c
index 1cb6424fb..be6382ec9 100644
--- a/src/video/vid_s3_virge.c
+++ b/src/video/vid_s3_virge.c
@@ -827,7 +827,7 @@ s3_virge_recalctimings(svga_t *svga)
     if ((svga->crtc[0x33] & 0x20) || ((svga->crtc[0x67] & 0xc) == 0xc)) {
         /* The S3 version of the Cirrus' special blanking mode, with identical behavior. */
         svga->hblankstart = (((svga->crtc[0x5d] & 0x02) >> 1) << 8) + svga->crtc[1]/* +
-                            ((svga->crtc[3] >> 5) & 3)*/ + 1;
+                            ((svga->crtc[3] >> 5) & 3) + 1*/;
         svga->hblank_end_val = svga->htotal - 1 /* + ((svga->crtc[3] >> 5) & 3)*/;
 
         svga->monitor->mon_overscan_y = 0;
@@ -836,7 +836,7 @@ s3_virge_recalctimings(svga_t *svga)
         /* Also make sure vertical blanking starts on display end. */
         svga->vblankstart = svga->dispend;
     } else {
-        svga->hblankstart    = (((svga->crtc[0x5d] & 0x04) >> 2) << 8) + svga->crtc[2] + 1;
+        svga->hblankstart    = (((svga->crtc[0x5d] & 0x04) >> 2) << 8) + svga->crtc[2];
 
         svga->hblank_end_val  = (svga->crtc[3] & 0x1f) | (((svga->crtc[5] & 0x80) >> 7) << 5) |
                                 (((svga->crtc[0x5d] & 0x08) >> 3) << 6);
diff --git a/src/video/vid_svga.c b/src/video/vid_svga.c
index b298fc4e1..d0f02929d 100644
--- a/src/video/vid_svga.c
+++ b/src/video/vid_svga.c
@@ -750,7 +750,7 @@ svga_recalctimings(svga_t *svga)
     } else
         svga->monitor->mon_overscan_x = 16;
 
-    svga->hblankstart    = svga->crtc[2] + 1;
+    svga->hblankstart    = svga->crtc[2];
     svga->hblank_end_val = (svga->crtc[3] & 0x1f) | ((svga->crtc[5] & 0x80) ? 0x20 : 0x00);
     svga->hblank_end_mask = 0x0000003f;
 
diff --git a/src/video/vid_voodoo_banshee.c b/src/video/vid_voodoo_banshee.c
index f03f6efd4..098e919d4 100644
--- a/src/video/vid_voodoo_banshee.c
+++ b/src/video/vid_voodoo_banshee.c
@@ -558,10 +558,10 @@ banshee_recalctimings(svga_t *svga)
            that is, no overscan and relying on display end to blank. */
         if (banshee->vgaInit0 & 0x40) {
             svga->hblankstart     = svga->crtc[1]/* + ((svga->crtc[3] >> 5) & 3)*/ +
-                                   (((svga->crtc[0x1a] & 0x04) >> 2) << 8) + 1;
+                                   (((svga->crtc[0x1a] & 0x04) >> 2) << 8);
             svga->hblank_end_mask = 0x0000007f;
         } else {
-            svga->hblankstart     = svga->crtc[1]/* + ((svga->crtc[3] >> 5) & 3)*/ + 1;
+            svga->hblankstart     = svga->crtc[1]/* + ((svga->crtc[3] >> 5) & 3)*/;
             svga->hblank_end_mask = 0x0000003f;
         }
         svga->hblank_end_val = svga->htotal - 1 /* + ((svga->crtc[3] >> 5) & 3)*/;
@@ -579,12 +579,12 @@ banshee_recalctimings(svga_t *svga)
         svga->linedbl     = 0;
      } else {
         if (banshee->vgaInit0 & 0x40) {
-            svga->hblankstart     = (((svga->crtc[0x1a] & 0x10) >> 4) << 8) + svga->crtc[2] + 1;
+            svga->hblankstart     = (((svga->crtc[0x1a] & 0x10) >> 4) << 8) + svga->crtc[2];
             svga->hblank_end_val  = (svga->crtc[3] & 0x1f) | (((svga->crtc[5] & 0x80) >> 7) << 5) |
                                     (((svga->crtc[0x1a] & 0x20) >> 5) << 6);
             svga->hblank_end_mask = 0x0000007f;
         } else {
-            svga->hblankstart     =  svga->crtc[2] + 1;
+            svga->hblankstart     =  svga->crtc[2];
             svga->hblank_end_val  =  (svga->crtc[3] & 0x1f) | (((svga->crtc[5] & 0x80) >> 7) << 5);
             svga->hblank_end_mask =  0x0000003f;
         }
@@ -652,9 +652,6 @@ banshee_recalctimings(svga_t *svga)
 
         if (banshee->vidProcCfg & VIDPROCCFG_2X_MODE) {
             svga->hdisp *= 2;
-            // svga->htotal *= 2;
-            // svga->hblankstart *= 2;
-            // svga->hblank_end_val *= 2;
             svga->dots_per_clock *= 2;
         }