become a standard part of the system and renamed it Job Entry Subsystem 2. JES2 was introduced in OS/VS2 in Release 2, also known as MVS, in 1973. It was many years before the HASP labels were removed from the source code, and the messages issued by JES2 are still prefixed with $HASP. Several JES2 commands continue to support specification of either JES2 or HASP to maintain backwards compatibility. ASP ASP initially stood for Attached Support Processor, and was developed to provide efficient use of multiple systems with a shared workload. It allowed one central system to distribute jobs to multiple connected systems; ASP could run a mixture of OS/360, SVS and 7090 emulation on a 360/65 main processor, but only OS/360 and SVS on other S/360 and S/370 models.. ASP was announced in March 1967, and that year was reported to be "running very stably". ASP evolved from the design of the 7094/7040 Direct Coupled System, using data channel to data channel communication. By attaching an IBM 7040 as a peripheral, processor throughput was more than doubled. In a typical ASP configuration, a small mainframe such as a 360/40 called the support system controlled one or more 360/65 or larger processors called main systems. The computers were connected through selector channels on each host attached to channel-to-channel adapters in an early form of short distance, point-to-point computer networking. ASP required the purchase of an additional computer to manage input and output of the hosts running the job workload, which was economically justified by the high cost of standalone byte-multiplexor channels needed to drive printers and punched card reader devices; the 360/50 and smaller systems had a built-in byte multiplexor channel, whereas the faster 360/65 and larger systems required a relatively expensive standalone unit. Using ASP made it possible to avoid the cost of the byte multiplexor channel, and offloading the job scheduling, print, and card handling also offloaded those functions from the larger machines. Increased reliability was another advantage to offset the added hardware cost. One or more main systems could fail or be taken offline for maintenance without taking down the whole complex. ASP was primarily targeted at large government agencies and defense contractors that might have as many as six 360/65s all being scheduled and managed by a separate ASP machine. An uncommon variant, local ASP (LASP), was a single large machine with the ASP functions running