12/2/2023 0 Comments Phoenix os wikiPhoenix/MVS is remembered for the responses that it gave to its HELP command. The system was decommissioned 24 years after its installation, on 30 September 1995 at 09:17 (by its own clock). In 1982 it was upgraded to an IBM 3081D, and in 1989 to an IBM 3084Q. GEC's OS4000 JCL was based on the Phoenix command interpreter.īy 1973 Phoenix had a thousand megabytes of disk space. It seems likely that some of the Bourne Shell's constructs in Unix also derived from the Titan command interpreter. Steve Bourne, who wrote the Bourne Shell for Unix, was at Cambridge in the 1960s and early 1970s. The Phoenix command interpreter was based on that of the Titan Multiple Access System which had inline input files and was in service from 1967. The initial product of their efforts was a Phoenix command interpreter which completely replaced the TSO command interpreter and was also available as a language for controlling batch job submissions through the use of a single IBM JCL command to invoke the Phoenix command interpreter. The staff were motivated to write their own system software for the IBM installation as a result of their dissatisfaction with IBM's own interactive command interpreter TSO. For full technical details of Parrot, see the technical report by Hazel and Stoneley. Even this solution proved to be unsatisfactory, and in 1975 TCAM was replaced by Parrot, with 200 terminals connected to the PDP-11, of which 80 could be simultaneously active. The PDP-11 was used instead of a bank of 2703s because for a projected 300 terminals a bank of 2703s was not scalable, too expensive, and inadequate for the Computing Service's needs, since it required paper tape readers and card punches as well. The initial system, supplied in 1972, comprised the PDP-11 emulating an IBM 2703 transmission control unit, which TCAM communicated with just as though it were a 2703. Their goal in doing so was to provide a better user interface than was available with a standard IBM system, alongside greater flexibility, reliability, and efficiency. The IBM-supplied Telecommunications Access Method (TCAM) and communications controller were replaced in 1975 by a system, called Parrot, that was created locally by the staff of the Computer Laboratory, comprising their own software and a PDP-11 complex. The petition was accepted and the extra store was delivered in September 1973. The following month, the Computing Service petitioned the Computer Board for an extra mebibyte of store, to double the amount of storage that the machine had. It was made available for test purposes to 20 selected users, via consoles in the public console room, in February 1973. "Phoenix/MVS" was also the name of the computer's operating system, written in-house by Computer Laboratory members. Phoenix (February 1973 – September 30, 1995) was an IBM mainframe computer at Cambridge University's Computer Laboratory. Parts of the power supply for the Phoenix computer at the Centre for Computing History
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