PDP-11/23 deskside machine

This evening I accidentally aquired a PDP-11/23 (model # 11E23-FE). It has RD-52A hard disk and dual floppies like the ones on a Rainbow. What can I do with it? It does boot and is running RT11 with 512k of ram. It appears to have a fault. It often runs for just a few minutes then drops to a @ prompt and starts spitting out strings of ? marks endlessly. Is this a failure anyone is familiar with? How can I tack more ram on it? The machine is is fairly good condition and appears complete. -- ----------------------------------------------------------- Jeffrey S. Worley Technical Services Bits & Bytes Computer Services Inc. 1979B Hendersonville Road Asheville, NC 28803 828-684-8953 - voice 0900-1700 five days 828-687-9284 - 24hr fax Who is General Failure and why is he reading my hard disk? Technoid(a)Cheta.net -----------------------------------------------------------