Well, I'm sure there's a DEC diagnostic for the DLV11-J, but I have no idea what it is. I did have a little ~20-instruction program that tests the receive and transmit interrupts, I'll send you the URLs for the source, and ODT script, forms. (Not sure what forms of object formats you can load into the machine.) Luckily that didn't fry anything. (I'm not looking down in disdain, I've made a few similar mistakes myself! I usually try and stop and check twice every time I go to turn the power on after I've fiddled with the hardware, for precisely that reason.) I wonder if that's because there's no drive? Is this test suppose to need one, I forget (I think you said but I'm too lazy to look :-). Noel