--- a/romdb.c	Thu Apr 18 22:06:47 2019 -0700
+++ b/romdb.c	Sat Apr 18 11:42:53 2020 -0700
@@ -77,6 +77,7 @@
 	switch(gen->mapper_type)
 	{
 	case MAPPER_SEGA:
+	case MAPPER_SEGA_SRAM:
 		sega_mapper_serialize(gen, buf);
 		break;
 	case MAPPER_REALTEC:
@@ -96,13 +97,14 @@
 {
 	genesis_context *gen = vcontext;
 	uint8_t mapper_type = load_int8(buf);
-	if (mapper_type != gen->mapper_type) {
-		warning("Mapper type mismatch, skipping load of mapper state");
+	if (mapper_type != gen->mapper_type && (mapper_type != MAPPER_SEGA || gen->mapper_type != MAPPER_SEGA_SRAM)) {
+		warning("Mapper type mismatch, skipping load of mapper state\n");
 		return;
 	}
 	switch(gen->mapper_type)
 	{
 	case MAPPER_SEGA:
+	case MAPPER_SEGA_SRAM:
 		sega_mapper_deserialize(buf, gen);
 		break;
 	case MAPPER_REALTEC:
@@ -242,7 +244,7 @@
 		save_size /= 2;
 	}
 	info->save_size = save_size;
-	info->save_buffer = malloc(save_size);
+	info->save_buffer = calloc(save_size, 1);
 	return ram_start;
 }
 
@@ -254,6 +256,7 @@
 	} else if (rom_end > nearest_pow2(size)) {
 		rom_end = nearest_pow2(size);
 	}
+	info->save_type = SAVE_NONE;
 	if (size >= 0x80000 && !memcmp("SEGA SSF", rom + 0x100, 8)) {
 		info->mapper_start_index = 0;
 		info->mapper_type = MAPPER_SEGA;
@@ -310,7 +313,7 @@
 		info->map[0].read_16 = nor_flash_read_w;
 		info->map[0].read_8 = nor_flash_read_b;
 		info->map[0].flags = MMAP_READ_CODE | MMAP_CODE;
-		info->map[0].buffer = info->save_buffer = malloc(info->save_size);
+		info->map[0].buffer = info->save_buffer = calloc(info->save_size, 1);
 		uint32_t init_size = size < info->save_size ? size : info->save_size;
 		memcpy(info->save_buffer, rom, init_size);
 		byteswap_rom(info->save_size, (uint16_t *)info->save_buffer);
@@ -365,7 +368,7 @@
 				info->map[1].buffer = info->save_buffer;
 			} else {
 				//Assume the standard Sega mapper
-				info->mapper_type = MAPPER_SEGA;
+				info->mapper_type = MAPPER_SEGA_SRAM;
 				info->map[0].end = 0x200000;
 				info->map[0].mask = 0xFFFFFF;
 				info->map[0].flags = MMAP_READ;
@@ -381,8 +384,13 @@
 				info->map[1].write_16 = (write_16_fun)write_sram_area_w;//these will be called all writes to the area
 				info->map[1].write_8 = (write_8_fun)write_sram_area_b;
 				info->map[1].buffer = rom + 0x200000;
-
+				
+				//Last entry in the base map is a catch all one that needs to be
+				//after all the other entries
+				memmap_chunk *unused = info->map + info->map_chunks - 2;
 				memmap_chunk *last = info->map + info->map_chunks - 1;
+				*last = *unused;
+				last = unused;
 				memset(last, 0, sizeof(memmap_chunk));
 				last->start = 0xA13000;
 				last->end = 0xA13100;
@@ -489,8 +497,7 @@
 			fatal_error("SRAM size %s is invalid\n", size);
 		}
 		state->info->save_mask = nearest_pow2(state->info->save_size)-1;
-		state->info->save_buffer = malloc(state->info->save_size);
-		memset(state->info->save_buffer, 0, state->info->save_size);
+		state->info->save_buffer = calloc(state->info->save_size, 1);
 		char *bus = tern_find_path(state->root, "SRAM\0bus\0", TVAL_PTR).ptrval;
 		if (!strcmp(bus, "odd")) {
 			state->info->save_type = RAM_FLAG_ODD;
@@ -567,6 +574,9 @@
 		if (!strcmp(init, "ROM")) {
 			uint32_t init_size = state->rom_size > state->info->save_size ? state->info->save_size : state->rom_size;
 			memcpy(state->info->save_buffer, state->rom, init_size);
+			if (init_size < state->info->save_size) {
+				memset(state->info->save_buffer + init_size, 0xFF, state->info->save_size - init_size);
+			}
 			if (state->info->save_bus == RAM_FLAG_BOTH) {
 				byteswap_rom(state->info->save_size, (uint16_t *)state->info->save_buffer);
 			}
@@ -712,7 +722,7 @@
 		if (!size || size > map->end - map->start) {
 			size = map->end - map->start;
 		}
-		map->buffer = malloc(size);
+		map->buffer = calloc(size, 1);
 		map->mask = calc_mask(size, start, end);
 		map->flags = MMAP_READ | MMAP_WRITE;
 		char *bus = tern_find_ptr_default(node, "bus", "both");