unmodified under VMS on the VAX-11 machines. The code for this emulation handled all of the kernel processes that would normally be handled by a RSTS kernel running on a PDP-11. The original BASIC-PLUS language that has carried through all versions of RSTS was subcontracted by Evans Griffiths & Hart, Inc. for a fixed price of $10,500. Other PDP-11 emulators RSTS and its applications can run under a number of PDP-11 emulators such as SIMH and Ersatz-11. For more information, see PDP-11. RSTS mascot Spike and Albert Versions RSTS was originally called BTSS (Basic Time Sharing System). Before shipment began, the name was changed from BTSS to RTSS because a product called BTSS was already being marketed by Honeywell. A simple typing mistake changed the name from RTSS to RSTS. The addition of new memory management support and the ability to install more memory in the PDP-11/40 and PDP-11/45 led to another name change: RSTS-11 now became RSTS/E. Clones in the USSR DOS-KP ("ДОС-КП") Applications Computer bureaus sometimes deployed User-11 for RSTS/E-based data management. See also Asynchronous System Trap BASIC-Plus-2 Concise Command Language DATATRIEVE DECnet Front panel Kevin Mitnick Local Area Transport Octal Debugging Technique QIO Record Management Services Runtime system SYSTAT (command) Time-sharing Time-sharing system evolution References External links Elvira at The Royal Institute of Technology in Stockholm, Sweden RSTS Hobbyist Site SimH web page Wofford Witch DEC operating systems PDP-11 Discontinued operating systems Time-sharing operating systems Assembly language software 1970 software