Hi Bob I'd gotten the hard drive for the Nicolet but not had time to fiddle with it. I'm currently redoing my code for the floppy drive on my Nicolet. I have a couple disk platters that should be able to be used for the hard drive ( and one that had a head crash ). I'd cleaned up the heads on the drive and with the new disk, seems OK. I've not fiddle with it since though. I was wondering if you'd like to fiddle with it on your Nicolet. You could barrow it for some time and install the demon code on it. On a separate issue, when I'd gotten my Nicolet, I had 2 failed ICs. One was a 7474 and the other was a DTL with expanded input ( I swapped a location that didn't need the expander input and use a TTL there for that part ). I just got started again and found the address wouldn't increment. After some frantic trouble shooting ( knowing it was Saturday and most places would be closed tomorrow for parts ), I finally traced it to a bad 7404. It is not easy without an extender card. I'd attach a couple wires to locations I wanted to see and stick the card back in. I must have pulled an inserted two of the cards 30 times. I hope is wiped the connector pins good and clean. If you should decide to make an extender, I'd split the cost of the boards with you. I think it would be easy to make three separate extenders and put a rail across them to hold them together. It wouldn't be too bad to just have the three separate ones and be careful connecting things. I believe they are just three 100 pin connectors, like S100 boards use. Dwight