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diff --git a/hexed/transfer.h b/hexed/transfer.h
index b1aa7cd..b5a9817 100644
--- a/hexed/transfer.h
+++ b/hexed/transfer.h
@@ -1,8 +1,18 @@
+/* all data is big endian */
+
 #define CMD_PREFIX	0x5a
 #define CMD_MD_SEND	0xc1	/* send to MD:   addr[3], len[3], data[] */
 #define CMD_MD_RECV	0xc2	/* recv from MD: addr[3], len[3], data[] */
 #define CMD_JUMP	0xc3	/* jump to addr: addr[3] */
-#define CMD_TEST	0xc4	/* test code */
+#define CMD_IOSEQ	0xc4	/* perform i/o ops: count[2], [type[1], addr[3], data[{0,1,2,4}]]* */
+#define CMD_TEST	0xc5	/* test code */
 
 #define CMD_FIRST	CMD_MD_SEND
 #define CMD_LAST	CMD_TEST
+
+#define IOSEQ_R8	0xb0
+#define IOSEQ_R16	0xb1
+#define IOSEQ_R32	0xb2
+#define IOSEQ_W8	0xb3
+#define IOSEQ_W16	0xb4
+#define IOSEQ_W32	0xb5