diff --git a/include/dolphin/CARDPriv.h b/include/dolphin/CARDPriv.h
index afad3a5b..0b94a1a3 100644
--- a/include/dolphin/CARDPriv.h
+++ b/include/dolphin/CARDPriv.h
@@ -11,6 +11,8 @@ extern "C" {
 #define CARD_FAT_FREEBLOCKS     0x0003u
 #define CARD_FAT_LASTSLOT       0x0004u
 
+#define CARD_SEG_SIZE 512u
+
 #define CARD_NUM_SYSTEM_BLOCK 5
 #define CARD_SYSTEM_BLOCK_SIZE (8 * 1024u)
 
diff --git a/obj_files.mk b/obj_files.mk
index 1abaa5ad..6bd09114 100644
--- a/obj_files.mk
+++ b/obj_files.mk
@@ -817,7 +817,7 @@ DTK_FILES :=\
 CARD_FILES :=\
 	$(BUILD_DIR)/asm/Dolphin/card/CARDBios.o\
 	$(BUILD_DIR)/src/Dolphin/card/CARDUnlock.ep.o\
-	$(BUILD_DIR)/asm/Dolphin/card/CARDRdwr.o\
+	$(BUILD_DIR)/src/Dolphin/card/CARDRdwr.ep.o\
 	$(BUILD_DIR)/asm/Dolphin/card/CARDBlock.o\
 	$(BUILD_DIR)/asm/Dolphin/card/CARDDir.o\
 	$(BUILD_DIR)/asm/Dolphin/card/CARDCheck.o\
diff --git a/src/Dolphin/card/CARDRdwr.c b/src/Dolphin/card/CARDRdwr.c
new file mode 100644
index 00000000..737d94d8
--- /dev/null
+++ b/src/Dolphin/card/CARDRdwr.c
@@ -0,0 +1,104 @@
+#include <dolphin/card.h>
+#include <dolphin/dsp.h>
+#include <dolphin/dvd.h>
+#include <dolphin/os.h>
+
+#include <dolphin/CARDPriv.h>
+
+static void BlockReadCallback(s32 chan, s32 result) {
+  CARDControl* card;
+  CARDCallback callback;
+
+  card = &__CARDBlock[chan];
+  if (result < 0) {
+    goto error;
+  }
+
+  card->xferred += 0x200;
+
+  card->addr += 0x200;
+  (u8*)card->buffer += 0x200;
+  if (--card->repeat <= 0) {
+    goto error;
+  }
+
+  result = __CARDReadSegment(chan, BlockReadCallback);
+  if (result < 0) {
+    goto error;
+  }
+  return;
+
+error:
+  if (card->apiCallback == 0) {
+    __CARDPutControlBlock(card, result);
+  }
+  callback = card->xferCallback;
+  if (callback) {
+    card->xferCallback = 0;
+    callback(chan, result);
+  }
+}
+
+s32 __CARDRead(s32 chan, u32 addr, s32 length, void* dst, CARDCallback callback) {
+  CARDControl* card;
+  card = &__CARDBlock[chan];
+  if (!card->attached) {
+    return CARD_RESULT_NOCARD;
+  }
+
+  card->xferCallback = callback;
+  card->repeat = (int)(length / CARD_SEG_SIZE);
+  card->addr = addr;
+  card->buffer = dst;
+
+  return __CARDReadSegment(chan, BlockReadCallback);
+}
+
+static void BlockWriteCallback(s32 chan, s32 result) {
+  CARDControl* card;
+  CARDCallback callback;
+
+  card = &__CARDBlock[chan];
+  if (result < 0) {
+    goto error;
+  }
+
+  card->xferred += 128;
+
+  card->addr += 128;
+  (u8*)card->buffer += 128;
+  if (--card->repeat <= 0) {
+    goto error;
+  }
+
+  result = __CARDWritePage(chan, BlockWriteCallback);
+  if (result < 0) {
+    goto error;
+  }
+  return;
+
+error:
+  if (card->apiCallback == 0) {
+    __CARDPutControlBlock(card, result);
+  }
+  callback = card->xferCallback;
+  if (callback) {
+    card->xferCallback = 0;
+    callback(chan, result);
+  }
+}
+
+s32 __CARDWrite(s32 chan, u32 addr, s32 length, void* dst, CARDCallback callback) {
+  CARDControl* card;
+  card = &__CARDBlock[chan];
+  if (!card->attached) {
+    return CARD_RESULT_NOCARD;
+  }
+
+  card->xferCallback = callback;
+  card->repeat = (int)(length / 128u);
+  card->addr = addr;
+  card->buffer = dst;
+
+  return __CARDWritePage(chan, BlockWriteCallback);
+}