What is OBA11-VA?

The BA11-VA was a small Q-bus enclosure with power supply. Most often, in the "SB11' system, it enclosed an LSI-11/03 equipped with a MXV11 and sometimes extra serial lines like DLV11J and sometimes a GPIB card (IBV11?) or general purpose parallel I/O. If yours had TU58's attached it was probably used like a small industrial/scientific controller or data logger or development system. Sometimes they had custom applicatons burnt into the EPROM in the MXV11, other times they just used a regular bootloader and booted RT-11 from TU58 which than ran the application. Look inside and see if you've got IBV11's or other I/O type cards. Up through the 90's similar small desktop Q-bus chassis were sold by MTI and Andromeda for similar purposes (although by the 90's with more modern peripherals than the TU58!) I traveled with an Andromeda Q-bus system a lot in the 90's. Tim.