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As shown in the article the system i from IBM (aka AS/400) is an example of this architecture. Originally 48bit it moved to 64bit when the RISC (power) processo
by Shivetya 13y ago
As shown in the article the system i from IBM (aka AS/400) is an example of this architecture. Originally 48bit it moved to 64bit when the RISC (power) processors came to the forefront. Yet that memory model is only element to the longevity and flexibility of the platform.
However their best trick was keeping the machine code and OS so separate than when migrating to RISC from CISC you didn't even need the source code for the majority of code running on the system to migrate.
- rogerbinns 13y agoThe apps and most of the OS are distributed as the equivalent of high level byte code using 128 bit pointers. Once run it gets translated into the local machine code. For anyone unfamiliar with the AS/400 and predecessors I highly recommend the expensive book by Frank Soltis who is largely the architect of it. Many things were done very differently than other operating systems and applications. http://www.amazon.com/Inside-AS-400-Second-Edition/dp/1882419669 http://www.amazon.com/Inside-AS-400-Second-Edition/dp/188241...