neshawk - fix loading q-boy unif

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Sachen8259.cs

@@ -50,7 +50,11 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 					return false;
 			}
 			Cart.wram_size = 0; // cart responds to regs in 6000:7fff
-			Cart.vram_size = 0;
+
+			//zero 13-dec-2014 - Q-boy is example of game with vram, apparently.
+			//lets only clear vram if theres a chr rom
+			if(Cart.chr_size != 0)
+				Cart.vram_size = 0;
 
 			shiftmask = (1 << shiftout) - 1;
 			prg_bank_mask_32k = Cart.prg_size / 32 - 1;
@@ -131,6 +135,9 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 		{
 			if (addr < 0x2000)
 			{
+				if(VROM == null)
+					return base.ReadPPU(addr);
+
 				int idx = addr >> 11;
 				// in addition to fixing V-mirroring, simple fixes us to 1 bank
 				// this means for type C, simple has 1 8KiB chr bank

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.cs

@@ -630,6 +630,11 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 				{
 					LoadWriteLine("Using information from UNIF header");
 					choice = unif.CartInfo;
+					//ok, i have this Q-Boy rom with no VROM and no VRAM.
+					//looks like FCEUX policy is to allocate 8KB of chr ram no matter what UNLESS certain flags are set.
+					//we'll let individual boards override that and set 8KB here
+					choice.vram_size = 8;
+					//(do we need to suppress this in case theres a CHR rom? probably not. nes board base will use ram if no rom is available)
 					origin = EDetectionOrigin.UNIF;
 				}
 				if (iNesHeaderInfo != null)