[ChannelF] Add cart ram to memory domains, ensure loading a savestate keep the correct byte array for memory domains, expose cart ram for cheevos

src/BizHawk.Client.EmuHawk/RetroAchievements/RetroAchievements.Memory.cs

@@ -565,6 +565,11 @@ namespace BizHawk.Client.EmuHawk
 						// special case
 						mfs.Add(new ChanFMemFunctions(debuggable, domains["VRAM"]));
 						mfs.Add(new(domains.SystemBus, 0, domains.SystemBus.Size));
+						// only add in SRAM if it's from HANG/MAZE carts (where SRAM isn't on the System Bus)
+						if (domains.Has("SRAM") && domains["SRAM"].Size == 0x200)
+						{
+							mfs.Add(new(domains["SRAM"], 0, domains["SRAM"].Size));
+						}
 						break;
 					case ConsoleID.PCEngineCD:
 						mfs.Add(new(domains["System Bus (21 bit)"], 0x1F0000, 0x2000));

src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/Cart/VesCartBase.cs

@@ -12,6 +12,10 @@ namespace BizHawk.Emulation.Cores.Consoles.ChannelF
 		public virtual void SyncByteArrayDomain(ChannelF sys)
 		{
 			sys.SyncByteArrayDomain("ROM", _rom);
+			if (_ram?.Length > 0)
+			{
+				sys.SyncByteArrayDomain("SRAM", _ram);
+			}
 		}
 
 		public virtual byte[] ROM

src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/ChannelF.IStatable.cs

@@ -36,6 +36,12 @@ namespace BizHawk.Emulation.Cores.Consoles.ChannelF
 			CPU.SyncState(ser);
 			Cartridge.SyncState(ser);
 			ser.EndSection();
+
+			if (ser.IsReader)
+			{
+				SyncAllByteArrayDomains();
+			}
+
 			/*
 
 			byte[] core = null;