diff --git a/tool/main.c b/tool/main.c
index 19528fb..df472c2 100644
--- a/tool/main.c
+++ b/tool/main.c
@@ -157,14 +157,9 @@ struct option longopts[] = {
 	{ },
 };
 
-static void mempak_read_progress_cb(int addr)
+static void mempak_progress_cb(int addr, void *ctx)
 {
-	printf("\rReading address 0x%04x / 0x%04x  ", addr, MEMPAK_MEM_SIZE); fflush(stdout);
-}
-
-static void mempak_write_progress_cb(int addr)
-{
-	printf("\rWriting address 0x%04x / 0x%04x  ", addr, MEMPAK_MEM_SIZE); fflush(stdout);
+	printf("\r%s 0x%04x / 0x%04x  ", (char*)ctx, addr, MEMPAK_MEM_SIZE); fflush(stdout);
 }
 
 static int listDevices(void)
@@ -384,7 +379,7 @@ int main(int argc, char **argv)
 					int res;
 
 					printf("Reading mempak...\n");
-					res = gcn64lib_mempak_download(hdl, 0, &pak, mempak_read_progress_cb);
+					res = gcn64lib_mempak_download(hdl, 0, &pak, mempak_progress_cb, "Reading address");
 					printf("\n");
 					switch (res)
 					{
@@ -436,7 +431,7 @@ int main(int argc, char **argv)
 					}
 
 					printf("Writing to mempak...\n");
-					res = gcn64lib_mempak_upload(hdl, 0, pak, mempak_write_progress_cb);
+					res = gcn64lib_mempak_upload(hdl, 0, pak, mempak_progress_cb, "Writing address");
 					printf("\n");
 					if (res) {
 						switch(res)
diff --git a/tool/mempak_gcn64usb.c b/tool/mempak_gcn64usb.c
index dad0db0..b61bb02 100644
--- a/tool/mempak_gcn64usb.c
+++ b/tool/mempak_gcn64usb.c
@@ -162,7 +162,7 @@ int gcn64lib_mempak_writeBlock(gcn64_hdl_t hdl, unsigned short addr, unsigned ch
  * \param progressCb Callback to notify read progress (called after each block)
  * \return 0: Success, -1: No mempak, -2: IO/error, -3: Other errors
  */
-int gcn64lib_mempak_download(gcn64_hdl_t hdl, int channel, mempak_structure_t **mempak, void (*progressCb)(int cur_addr))
+int gcn64lib_mempak_download(gcn64_hdl_t hdl, int channel, mempak_structure_t **mempak, void (*progressCb)(int cur_addr, void *ctx), void *ctx)
 {
 	mempak_structure_t *pak;
 	unsigned short addr;
@@ -189,7 +189,7 @@ int gcn64lib_mempak_download(gcn64_hdl_t hdl, int channel, mempak_structure_t **
 			return -2;
 		}
 		if (progressCb) {
-			progressCb(addr);
+			progressCb(addr, ctx);
 		}
 	}
 	*mempak = pak;
@@ -197,7 +197,7 @@ int gcn64lib_mempak_download(gcn64_hdl_t hdl, int channel, mempak_structure_t **
 	return 0;
 }
 
-int gcn64lib_mempak_upload(gcn64_hdl_t hdl, int channel, mempak_structure_t *pak, void (*progressCb)(int cur_addr))
+int gcn64lib_mempak_upload(gcn64_hdl_t hdl, int channel, mempak_structure_t *pak, void (*progressCb)(int cur_addr, void *ctx), void *ctx)
 {
 	unsigned short addr;
 	unsigned char readback[0x20];
@@ -230,7 +230,7 @@ int gcn64lib_mempak_upload(gcn64_hdl_t hdl, int channel, mempak_structure_t *pak
 		}
 
 		if (progressCb) {
-			progressCb(addr);
+			progressCb(addr, ctx);
 		}
 	}
 
diff --git a/tool/mempak_gcn64usb.h b/tool/mempak_gcn64usb.h
index 0293fc5..afc5a6b 100644
--- a/tool/mempak_gcn64usb.h
+++ b/tool/mempak_gcn64usb.h
@@ -7,7 +7,7 @@ int gcn64lib_mempak_detect(gcn64_hdl_t hdl);
 int gcn64lib_mempak_readBlock(gcn64_hdl_t hdl, unsigned short addr, unsigned char dst[32]);
 int gcn64lib_mempak_writeBlock(gcn64_hdl_t hdl, unsigned short addr, unsigned char data[32]);
 
-int gcn64lib_mempak_download(gcn64_hdl_t hdl, int channel, mempak_structure_t **mempak, void (*progressCb)(int cur_addr));
-int gcn64lib_mempak_upload(gcn64_hdl_t hdl, int channel, mempak_structure_t *pak, void (*progressCb)(int cur_addr));
+int gcn64lib_mempak_download(gcn64_hdl_t hdl, int channel, mempak_structure_t **mempak, void (*progressCb)(int cur_addr, void *ctx), void *ctx);
+int gcn64lib_mempak_upload(gcn64_hdl_t hdl, int channel, mempak_structure_t *pak, void (*progressCb)(int cur_addr, void *ctx), void *ctx);
 
 #endif // _mempak_gcn64usb_h__