diff --git a/src/mem.c b/src/mem.c
index 01a7df7..2e4f33c 100644
--- a/src/mem.c
+++ b/src/mem.c
@@ -1827,7 +1827,8 @@ void mem_init()
         mem_mapping_add(&ram_low_mapping, 0x00000, (mem_size > 640) ? 0xa0000 : mem_size * 1024, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram,  MEM_MAPPING_INTERNAL, NULL);
         if (mem_size > 1024)
                 mem_mapping_add(&ram_high_mapping, 0x100000, ((mem_size - 1024) * 1024), mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram + 0x100000, MEM_MAPPING_INTERNAL, NULL);
-        mem_mapping_add(&ram_mid_mapping,   0xc0000, 0x40000, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram + 0xc0000,  MEM_MAPPING_INTERNAL, NULL);
+	if (mem_size > 768)
+        	mem_mapping_add(&ram_mid_mapping,   0xc0000, 0x40000, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram + 0xc0000,  MEM_MAPPING_INTERNAL, NULL);
 
         mem_mapping_add(&romext_mapping,  0xc8000, 0x08000, mem_read_romext, mem_read_romextw, mem_read_romextl, NULL, NULL, NULL,   romext, 0, NULL);
 //        pclog("Mem resize %i %i\n",mem_size,c);
@@ -1879,7 +1880,8 @@ void mem_resize()
         mem_mapping_add(&ram_low_mapping, 0x00000, (mem_size > 640) ? 0xa0000 : mem_size * 1024, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram,  MEM_MAPPING_INTERNAL, NULL);
         if (mem_size > 1024)
                 mem_mapping_add(&ram_high_mapping, 0x100000, (mem_size - 1024) * 1024, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram + 0x100000, MEM_MAPPING_INTERNAL, NULL);
-        mem_mapping_add(&ram_mid_mapping,   0xc0000, 0x40000, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram + 0xc0000,  MEM_MAPPING_INTERNAL, NULL);
+	if (mem_size > 768)
+	        mem_mapping_add(&ram_mid_mapping,   0xc0000, 0x40000, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram + 0xc0000,  MEM_MAPPING_INTERNAL, NULL);
 
         mem_mapping_add(&romext_mapping,  0xc8000, 0x08000, mem_read_romext, mem_read_romextw, mem_read_romextl, NULL, NULL, NULL,   romext, 0, NULL);