fixed alttiming

changelog.txt

@@ -17,8 +17,9 @@ used in a few games (now use game database) as backup RAM. This should fix SRAM
 - corrected pixel sprite limit emulation
 - corrected sprite collision detection
 - added 9bits (RGB333) pixelcolor extrapolation to support fullcolor range (0-65535) when using 16bits rendering (RGB 565)
-- completely rewrote interrupt (VINT/HINT) handling: Sesame's Street Counting Cafe now works without any hacks
-- corrected H-Counters value again: Road Rash games (I,II,III) don't need any timing hacks anymore
+- completely rewrote interrupt (VINT/HINT) handling: Sesame's Street Counting Cafe now works without any hacks,
+no other timing sensitive game seems to be broken
+- corrected Hcounter table: Road Rash games (I,II,III) don't need any timing hacks anymore
 - corrected VDP latency so it does not interfere with DMA timings anymore
 
 

genplus.txt

@@ -154,22 +154,15 @@ IMPORTANT: When putting roms either on DVD or SDCARD, it is recommended to use s
 
     VDP Latency is used to be more accurate in term of VRAM write timing, 
     it is required by some games (Chaos Engine...) to be displayed properly
-    (OFF by default, automatically set when specific roms are detected)
+    (ON by default)
 
     DMA Timing is used to be more accurate in term of DMA copy to V-RAM timing,
     it is required by some games (Legend of Galahad...) to be displayed properly
     (ON by default)
 
-    ALT. timing let you modify the line rendering timing. This is used in some games
-    (Road Rash series, Legend of Galahad) which have single line display glitch
-    (OFF by default, automatically set when specific roms are detected)
-
-    NOTE: These options are now automatically set when loading a game which need special timing fixes.
-          These fixes are also now automatically desactivated when the current game doesn't need them.
-          For your information, games that actually need special timings to run properly are:
-		.Legend of Galahad & Road Rash series (single line not rendered properly)
-		.Sesame Street Counting Cafe (don't boot)
-		.Chaos Engine/Soldiers of Fortune (graphic glitches when scrolling)
+    ALT. timing let you modify the line rendering timing. This is needed by some games
+    (Lotus 2 RECS) to prevent display glitches
+    (OFF by default, automatically set when specific rom is detected)
 
     CPU Mode let you force the CPU speed for the game:
       * AUTO: orignal CPU speed is automatically detected 

source/ngc/loadrom.c

@@ -83,25 +83,13 @@ void genesis_set_region ()
  * set specific timings for some games
  */
  extern uint8 alttiming;
- extern uint8 irqtiming;
  extern uint8 sys_type[2];
 
- void patch_game()
+ void detect_game()
  {
-	 if ((strstr(rominfo.product,"T-50406")  != NULL) ||	/* Legend of Galahad */
-		 (strstr(rominfo.product,"MK-1079")  != NULL) ||	/* Sonic the Hedgehog 3 (JUE) */
-		 (strstr(rominfo.product,"MK-1563")  != NULL) ||	/* Sonic & Knuckes + Sonic the Hedgehog 3 (JUE) */
-		 (strstr(rominfo.product,"T-50116")  != NULL) ||	/* Road Rash */
-		 (strstr(rominfo.product,"T-50496")  != NULL) ||	/* Road Rash 2 (UE) */
-         (strstr(rominfo.product,"T-106143") != NULL) ||	/* Road Rash 2 (J) */
-		 (strstr(rominfo.product,"T-50966")  != NULL)		/* Road Rash 3 (UE) */
-		) alttiming = 1;
+	 if (strstr(rominfo.product,"T-50746")  != NULL) alttiming = 1;
 	 else alttiming = 0;
 
-	 /* Sesame's Street Counting Cafe */
-	 if (strstr(rominfo.product,"T-50896") != NULL) irqtiming = 1;
-     else irqtiming = 0;
-
 	 /* Menacer 6-in-1 Pack */
 	 if (strstr(rominfo.product,"MK-1658") != NULL)
 	 {
@@ -189,7 +177,7 @@ void reloadrom ()
     SRAM_Init ();			/* SRAM Infos from ROM header */
     getrominfo (cart_rom);	/* Other Infos from ROM Header */
     genesis_set_region ();	/* Region Detection */
-	patch_game();			/* game special patches */
+	detect_game();			/* game special patches */
 
 	system_init ();
 	audio_init(48000);

source/system.c

@@ -249,13 +249,11 @@ int system_frame (int do_skip)
 			{
 				h_counter = reg[10];
 				hint_pending = 1;
-			  	if (alttiming) m68k_run(aim_m68k - 456); /* fix Legend of Galahad */
 			}
 		}
 
-
-		/* Render a line of the display if needed */
-	  	if (do_skip == 0)
+	  	/* hack for Lotus 2 Recs */
+	  	if (alttiming && !do_skip)
 		{
 			if (v_counter < frame_end) render_line(v_counter);
 			if (v_counter < (frame_end-1)) parse_satb(0x81 + v_counter);
@@ -266,6 +264,12 @@ int system_frame (int do_skip)
 		m68k_run(aim_m68k - 404);
 		status &= 0xFFFB; // HBlank = 0
 
+		if (!alttiming && !do_skip)
+		{
+			if (v_counter < frame_end) render_line(v_counter);
+	        if (v_counter < (frame_end-1)) parse_satb(0x81 + v_counter);
+	    }
+	  
 		if (v_counter == frame_end)
 		{
 			/* V Retrace */

source/vdp.c

@@ -87,8 +87,7 @@ uint8 vdp_rate = 60;        /* CPU speed (60Hz by default)*/
 void (*color_update) (int index, uint16 data);
 
 uint8 dmatiming = 1;
-uint8 vdptiming = 0;
-uint8 irqtiming = 0;
+uint8 vdptiming = 1;
 
 /*--------------------------------------------------------------------------*/
 /* Init, reset, shutdown functions                                          */