A bit surprised, since the RX01 is a really small device, and squeezing in RT-11, in addition to VMB, as a bare minimum needed for a system, is something of a miracle. RT-11 could fit on tiny things. I remember V2 fitting with lots of room to spare on a DECnet (TU56 -- 578 kbytes). And if memory serves I could fit in (SJ flavor) along with Basic on an RC11 (128 kbytes), on our Physics department 11/20. paul