O2Hawk: small timing fix

BizHawk.Emulation.Cores/CPUs/Intel8048/I8048.cs

@@ -490,6 +490,7 @@ namespace BizHawk.Emulation.Cores.Components.I8048
 
 			if (counter_en)
 			{
+				// NOTE: Odyssey 2 games tend to enable the counter within a few cycles of a falling edge and expect to count to take place
 				if (!T1 && T1_old && (TotalExecutedCycles > next_T1_check))
 				{
 					if (Regs[TIM] == 255)

BizHawk.Emulation.Cores/Consoles/Magnavox/Odyssey2/PPU.cs

@@ -253,7 +253,8 @@ namespace BizHawk.Emulation.Cores.Consoles.O2Hawk
 			}
 			else
 			{
-				if (cycle == 182 && (LY < LINE_VBL))
+				// NOTE: most games expect one less T1 pulse after VBL, maybe some pre-render line
+				if (cycle == 182 && (LY < LINE_VBL) && (LY > 0))
 				{
 					HBL = true;
 					// Send T1 pulses