diff --git a/build_rom.sh b/build_rom.sh
index c2181c2..b6efc71 100755
--- a/build_rom.sh
+++ b/build_rom.sh
@@ -2,4 +2,3 @@
 m68k-elf-as -m68010 --register-prefix-optional -o rom.o rom.68k
 m68k-elf-ld -z max-page-size=1 -T rom.ld -o rom.elf rom.o
 m68k-elf-objcopy -O binary rom.elf rom.bin
-
diff --git a/ram_map.c b/ram_map.c
new file mode 100755
index 0000000..3c8d5be
--- /dev/null
+++ b/ram_map.c
@@ -0,0 +1,53 @@
+#include <stdint.h>
+
+uint8_t find_all_ram_cards(uint8_t* buf /* a1 */) {
+	uint8_t len = 0; // move.b 0, d0
+	void* curr_card = (void*)0xff0000; // a0 = 0xff0000
+	while(1) { // farc_loop:
+		curr_card += 0x100; // lea (0x100, a0), a0 
+		uint8_t type = *((uint8_t*)(curr_card+0xff)); // move.b (0xff, a0), d0
+		if (type == 0) { // beq.b farc_done
+			break;
+		}
+		if (type != 2) { // cmp.b #0x2, d0; bne.b farc_loop
+    	continue; 
+		}
+		*buf = (uint8_t)((uint32_t)curr_card>>16);
+		buf += 1; // inc a1
+		len += 1; // inc d1
+	} // bra.b farc_loop
+	// farc_done:
+	return len;
+}
+
+void sort_ram_cards(uint8_t* buf) {
+	uint8_t len = find_all_ram_cards(buf);
+	// Insertion sort buf using the aligment of the cards
+	uint8_t i = 1;
+	while(1) {
+		if (i >= len) {
+			break;
+		}
+		uint8_t num = buf[i];
+		void* card = (void*)((uint32_t)num<<16);
+		*((uint32_t*)card)=0xfffffffe;
+		uint32_t x = ~(*((uint32_t*)card)) + 1;
+		uint8_t j = i - 1;
+		while(1) {
+			if (j == 0) {
+				break;
+			}
+			uint8_t num = buf[j];
+			void* card = (void*)((uint32_t)num<<16);
+			*((uint32_t*)card)=0xfffffffe;
+			uint32_t aj = ~(*((uint32_t*)card)) + 1;
+			if (aj <= x) {
+				break;
+			}
+			buf[j + 1] = buf[j];
+			j = j - 1;
+		}
+		buf[j + 1] = buf[i];
+		i = i + 1;
+	}
+}