Hello, Does anyone know what this error code means? 1 1 1 1 -------------M7164-1-2-4-8--------------- 0 0 0 1 -------------M7165-1-2-4-8--------------- it shows immediatly this code, no other combination after power up. The Users Guide does not mention it. I've remove W2 and W3 on both modules (for Q22/CD slots). The qbus backplane only contains the uVAX II processor board and the kda50. Any idea what I could test on the module? I tried >>> e 172150 (read IP register) but it's invalid. Lothar