Interestingly I was in touch with the author of SP89 regarding the problem. He obviously swore that the program and hardware design worked. I can assure everyone that nothing I tried here without a 100 ohm resistor on MISO worked--but perhaps some parallel ports don't need it and that's why it worked for the author of SP89 and certainly many others that have used SP89. I'm surprised that they've never had to deal with this issue before, though.