diff --git a/flag.c b/flag.c
index e1f7e23..eed1eab 100644
--- a/flag.c
+++ b/flag.c
@@ -53,6 +53,16 @@ static uint32 flag_get_dword_lh(uint8 *p)
          ((uint32)p[3] << 24));
 }
 
+static void flag_debug_bytes(char *tag, uint8 *p, int len)
+{
+  int i;
+  fprintf(stderr, "FLAGDBG %s len=%d", tag, len);
+  if (len > 32) len = 32;
+  for (i = 0; i < len; i++)
+    fprintf(stderr, " %02X", p[i]);
+  fprintf(stderr, "\n");
+}
+
 static int flag_get_current_drive(void)
 {
   REGS regs;
@@ -137,6 +147,10 @@ static int flag_ncp87_obtain_attrs(char *name, uint32 *attrs)
   repl.len = sizeof(repl.data);
 
   neterrno = Net_Call(0x5700, &req, &repl);
+  fprintf(stderr, "FLAGDBG obtain name=%s rc=%d req.len=%u repl.len=%u\n",
+          name, neterrno, req.len, repl.len);
+  flag_debug_bytes("obtain-repl", repl.data, repl.len);
+
   if (neterrno)
     return(-1);
 
@@ -147,6 +161,9 @@ static int flag_ncp87_obtain_attrs(char *name, uint32 *attrs)
   if (attrs)
     *attrs = flag_get_dword_lh(repl.data);
 
+  if (attrs)
+    fprintf(stderr, "FLAGDBG obtain attrs=%08lX\n", *attrs);
+
   return(0);
 }
 
@@ -193,6 +210,10 @@ static int flag_ncp87_modify_attrs(char *name, uint32 attrs)
   repl.len = sizeof(repl.data);
 
   neterrno = Net_Call(0x5700, &req, &repl);
+  fprintf(stderr, "FLAGDBG modify name=%s attrs=%08lX rc=%d req.len=%u repl.len=%u\n",
+          name, attrs, neterrno, req.len, repl.len);
+  flag_debug_bytes("modify-repl", repl.data, repl.len);
+
   if (neterrno)
     return(-1);