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Revision Date Username Comment
1718 Dec 2014 - 17:09ThomasMisa 
1618 Dec 2014 - 13:17ThomasMisa 
1518 Dec 2014 - 13:08ThomasMisa 
1418 Dec 2014 - 13:08ThomasMisa 
1318 Dec 2014 - 13:06ThomasMisaAttached file IBM_AS-400-family2.jpg 
1218 Dec 2014 - 12:33ThomasMisa 
1118 Dec 2014 - 12:28ThomasMisa(minor)  
1018 Dec 2014 - 11:12ThomasMisa 
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The Application System/400 (AS/400) was a "mid-range" family of IBM computers meant for small and intermediate-sized companies.(1) Introduced in 1988, the AS/400 replaced the System/38, while featuring compatibility with IBM's successful System/36 line of minicomputers.(2)(3)

Developed internally at IBM, the AS/400 originally included six processor models, and doubled the performance of the System/38 line it replaced.(4) In 1995 the AS/400 line moved from a custom, 48-bit IBM CISC CPU architecture, to a 64-bit POWER-based RISC CPU, which increased the address space. With more than 1,000 software packages released upon its launch, the AS/400 became a popular business system. "During 1998, IBM (delivered) an AS/400 to a customer every 12 minutes of every workday."(5)(6)(7) In 2000, the AS/400 was renamed as the iSeries, which remains in production with around 400,000 installations.(8)

The AS/400 originally shipped with three levels of security -- levels 10, 20, and 30 -- with level 10 providing no security, 20 requiring users to sign-on with a password, and level 30 giving differential levels of access, depending upon the user's permission level for accessing resources. Level 30 was the minimum level of security IBM recommended for users. IBM subsequently added levels 40 and 50, with level 40 restricting the range of instructions users and programs were allowed to use, depending upon the class-level of the user and program. Level 50, announced with OS/400 V2R3, added additional features to meet the NSA C2 certification standard, including "discretionary," need-to-know protection for system resources.(9)

xxx. (10)


1 , 7 , 8 : external http://www-03.ibm.com/ibm/history/exhibits/rochester/rochester_4010.html

2 : lock B. J. Pine, II, "Design, Test, and Validation of the Application System/400 Through Early User Involvement," IBM Systems Journal 28, no. 3 (1989), 376-377. (Login required)

3 : lock William Berg, Marshall Cline, and Mike Girou, "Lessons Learned from the OS/400 OO Project," Communications of the ACM 38, no. 10 (October 1995), 54-55. (Login required)

4 , 6 : lock as400.pdf, p. 1. - IBM AS/400 PDF (Login required)

5 : lock Arthur Norberg and Jeffrey R. Yost, IBM Rochester: Half Century of Innovation (IBM, 2006), 37-39. (Login required)

9 : Frank G. Soltis, "Chapter 17 - Security in a Web World". Fortress Rochester: The Inside Story of the IBM iSeries. (Loveland, CO: NEWS/400 Books, 2001) (ebook available http://www.books24x7.com/marc.asp?bookid=5707 )

10 : John Earl, "Auditing IBM AS/400 and System i," ISACA Journal Online (2008) at http://www.isaca.org/Journal/Past-Issues/2008/Volume-1/Documents/jopdf0801-auditing-ibm.PDF

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Topic revision: r10 - 18 Dec 2014 - 11:12:49 - ThomasMisa
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