save memory 0x0F mirroring, default sram to 0xFF, less restrictive save type search

src/crab/bus.cr

@@ -23,8 +23,8 @@ class Bus
     when 0x8, 0x9,
          0xA, 0xB,
          0xC, 0xD then @gba.cartridge.rom[index & 0x01FFFFFF]
-    when 0xE then @gba.storage[index & 0xFFFF]
+    when 0xE, 0xF then @gba.storage[index & 0xFFFF]
-    else          abort "Unmapped read: #{hex_str index.to_u32}"
+    else               abort "Unmapped read: #{hex_str index.to_u32}"
     end
   end
 
@@ -49,8 +49,8 @@ class Bus
     when 0x8, 0x9,
          0xA, 0xB,
          0xC, 0xD then (@gba.cartridge.rom.to_unsafe + (index & 0x01FFFFFF)).as(HalfWord*).value
-    when 0xE then read_half_slow(index)
+    when 0xE, 0xF then read_half_slow(index)
-    else          abort "Unmapped read: #{hex_str index.to_u32}"
+    else               abort "Unmapped read: #{hex_str index.to_u32}"
     end
   end
 

src/crab/storage.cr

@@ -6,8 +6,8 @@ abstract class Storage
     FLASH512
     FLASH1M
 
-    def regex : Regex
+    def regex : Regex # don't rely on the 3 digits after this string
-      /#{self}_V\d{3}/
+      /#{self}_V/
     end
 
     def bytes : Int

src/crab/storage/sram.cr

@@ -1,5 +1,5 @@
 class SRAM < Storage
-  @memory = Bytes.new(Type::SRAM.bytes, 0x00)
+  @memory = Bytes.new(Type::SRAM.bytes, 0xFF)
 
   def [](index : Int) : Byte
     index < @memory.size ? @memory[index] : 0_u8