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System Support Program (SSP) was an operating system for the IBM System/34 and System/36 minicomputers. SSP was a command-based operating system released in 1977. == History == SSP originally contained 60 or so commands that were implemented on the System/34 from 1977 to 1983 in different versions called releases. Release 1 was issued with the original S/34 in 1977. Release 9 was issued in 1981. In 1983, IBM repackaged SSP on a new computer called the IBM System/36, which was not object-code compatible with the S/34. In 1994, IBM repackaged SSP on an updated model of the S/36 called the Advanced/36. The A/36 was an IBM AS/400 which had the SSP implemented as a "virtual machine". Major releases of SSP include: * S/34 Release 1.0 - this was apparently shipped with the first S/34 in 1977. * S/34 Release 8.0 - this seems to have been issued about 1980. * S/34 Release 9.0 - this was the last release for the S/34 c.1980. * S/36 Release 1.0 - this was apparently shipped with the first S/36 in 1983. * S/36 Release 4.0 - this was the release where S/36 was given 5 job queues. * S/36 Release 5.1 - this 1988 release was the last major change on 536X platforms. * S/36 Release 6.0 - also known as the VASP or Value-Added Support Product, this release added functionality that allowed program calls in RPG, and it also provided software to calculate the size AS/400 that the user would need when upgrading. The VASP was controversial. Rumors circulated in the industry papers that the customer could not go back to 5.1 if 6.0 did not function adequately. Program calls with RPG CALL/PARM were inferior to RPGIII designs and inferior to customer add-on products. * S/36 Release 7.1 - this 1994 release was shipped with the Advanced/36. The first A/36 machines would not function on a lower release and were also incompatible with 7.5. Rumors circulated that stated prior release compilers would not function on the Advanced/36, but they proved unfounded. There were reasons a programmer would rather use the 5.1 RPGII compiler instead of the presumably more advanced 7.x compiler. * S/36 Release 7.5 - this 1995 release was shipped with the second and final wave of the Advanced/36. Functions like WRKSYSVL allowed the operator to change the system time on the fly, which was interesting because customer add-ons to do this through assembler subroutines did not function on the Advanced/36. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IBM System/34, 36 System Support Program」の詳細全文を読む スポンサード リンク
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