(I sent this first to the rescue at sunhelp list, but figure people here might be of more help with older machines.) So, I've tried booting my Sun 3/180, and can't get it to work. With the switch set to "diag" on the back, I get the following output: Boot PROM Selftest PROM Checksum Test DVMA Reg Test Context Reg Test Segment Map Wr/Rd Test Segment Map Address Test Page Map Test Memory Path Data Test NXM Bus Error Test Interrupt Test TOD Clock Interrupt Test MMU Access Bit Test MMU Access/Modify Bit Test MMU Invalid Page Test MMU Protected Page Test Parity Test Err 9: Bad parity should cause nmi So, it suggests there's a problem with the CPU board. Does anyone have a spare 3/180 or 3/280+memory laying around? Alternatively, I could probably try to replace the "broken chip", assuming I can find a replacement, and a decent enough documentation to see what's wrong. And, yes I've already tried pulling out the other memory board in the system, all the RAM that's left is (soldered) on the CPU board. I have a feeling it's not the memory, however, which is the problem. So, if anyone has something I could use - either documentation or hardware - that would be much appreciated. : ) Pat -- Purdue University ITAP/RCS --- http://www.itap.purdue.edu/rcs/ The Computer Refuge --- http://computer-refuge.org