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games/md: ignore invalid writes (makes cave story work)

--- a/sys/src/games/md/mem.c

+++ b/sys/src/games/md/mem.c

@@ -75,7 +75,7 @@

 	case 0x30f3: case 0x30f5: case 0x30f7: case 0x30f9: case 0x30fb:

 		return;

 	}

-	sysfatal("write to 0xa1%.4x (pc=%#.6ux)", a, curpc);

+	fprint(2, "write to 0xa1%.4x (pc=%#.6ux)", a, curpc);

 }

 void

@@ -286,7 +286,7 @@

 		break;

 	default:

 	invalid:

-		sysfatal("write to %#.6x (pc=%#.6x)", a, curpc);

+		fprint(2, "write to %#.6x (pc=%#.6x)", a, curpc);

 	}

 }

@@ -404,7 +404,8 @@

 			memwrite(0xc00000 | a & 0x7e, v | v << 8, (a & 1) != 0 ? 0xff : 0xff00);

 			return;

 		}

-		sysfatal("z80 write to %#.4x (pc=%#.4x)", a, scurpc);

+		fprint(2, "z80 write to %#.4x (pc=%#.4x)", a, scurpc);

+		return;

 	default:

 		memwrite(z80bank << 15 | a & 0x7ffe, v << 8 | v, (a & 1) != 0 ? 0xff : 0xff00);

 	}