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add -s flag for SGB mode

--- a/src/fix/main.c

+++ b/src/fix/main.c

@@ -24,6 +24,7 @@

 #define OPTF_MBCTYPE	0x080L

 #define OPTF_GBCMODE	0x100L

 #define OPTF_JAPAN	0x200L

+#define OPTF_SGBMODE	0x400L

 unsigned long ulOptions;

@@ -70,6 +71,7 @@

 	printf("  -b<hx>\tSet MBC type\n");

 	printf("  -c\t\tSet Game Boy Color compatible flag ([0x143] = 0x80)\n");

 	printf("  -o\t\tSet Game Boy Color only flag       ([0x143] = 0xC0)\n");

+	printf("  -s\t\tSet Super Game Boy flags\n");

 	printf("  -q\t\tExecute quietly (suppress all text except errors)\n");

 	exit(0);

@@ -312,6 +314,9 @@

 				ulOptions |= OPTF_GBCMODE;

 				gbc_mode = 0x80;

 				break;

+			case 's':

+				ulOptions |= OPTF_SGBMODE;

+				break;

 			}

 		}

 		argn++;

@@ -510,6 +515,23 @@

 				if (cartname[0xF]) {

 					Warning("Last character of cartridge title was overwritten by '-%c' option", gbc_mode == 0x80 ? 'c' : 'o');

 				}

+			}

+		}

+		/*

+		 * -s (Set SGB mode) option code

+		 */

+		if (ulOptions & OPTF_SGBMODE) {

+			fflush(f);

+			// set old licensee code to 0x33

+			fseek(f, 0x14B, SEEK_SET);

+			fputc(0x33, f);

+			// set SGB flag to 0x03

+			fseek(f, 0x146, SEEK_SET);

+			fputc(3, f);

+			fflush(f);

+

+			if (!(ulOptions & OPTF_QUIET)) {

+				printf("Setting SGB mode flag\n");

 			}

 		}

 		/*