Contributor(s): Marland and Chuck Berghorn

The P/390 is basically an IBM mainframe system adapted to run on a personal computer. A P/390 comes on a single card that contains a System/390 instruction set, allowing operating systems such as OS/390, MVS, VM, and VSE, to be installed. The P/390 makes it possible to develop, test, and run application programs written for the mainframe on a smaller, more economical machine. After testing, programs that require mainframe capability can be moved to the mainframe. A common use of the P/390 today is for 2000 analysis and testing. The P/390 is sold as part of a PC workstation that also comes with an OS/2 operating system. The entire product is called the IBM PC Server System/390. The MVS and OS/390 operating systems require 128 megabyes of RAM. VM and VSE will install with 32 megabytes.

An R/390 is the P/390-PCI card installed on IBM's RS/6000 server. Both products are sold both as development environments and as economical approaches for companies with older mainframe systems to move their legacy applications to a new production environment.

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This was last updated in October 2008

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FWIW. The P/390 has not been available since around 2002. They do occasionally pop up for sale, however they cannot run the currently available mainframe operating systems from IBM.
is the replacement for P/390

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