diff --git a/doc/busses/i2c-hydra b/doc/busses/i2c-hydra
index c2eea5d2..d6eae786 100644
--- a/doc/busses/i2c-hydra
+++ b/doc/busses/i2c-hydra
@@ -4,7 +4,8 @@ Status: Complete and somewhat tested
 
 Supported adapters:
   * Apple `Hydra' Mac I/O
-    Datasheet: Publicly available (?)
+    Datasheet: Was publicly available from the Apple website, now seems to
+               have disappeared?!?
 
 Author: Geert Uytterhoeven <geert@linux-m68k.org>
 
diff --git a/prog/dump/isadump.c b/prog/dump/isadump.c
index 06eeb1c6..ee4742a6 100644
--- a/prog/dump/isadump.c
+++ b/prog/dump/isadump.c
@@ -99,7 +99,7 @@ int main(int argc, char *argv[])
   sleep(5);
 
 #ifndef __powerpc__
-  if ((datareg < 0x400) && (datareg < 0x400)) {
+  if ((datareg < 0x400) && (addrreg < 0x400)) {
     if(ioperm(datareg,1,1)) {
       fprintf(stderr,"Error: Could not ioperm() data register!\n");
       exit(1);