PC-based IBM mainframe-compatible systems: Difference between revisions

Revision as of 16:29, 28 November 2006

Revision as of 16:31, 28 November 2006

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An important goal in the design of the S/390 Processor Card was complete compatibility with existing mainframe operating systems and software. The processor implements all of the ESA/390 and XA instructions which prevents the need for instruction translation. There are three generations of the card:

* The original S/390 Processor Card incorporated 32MB of dedicated memory, with an optional 32MB or 96MB daughter cardcards, for a combined total of 64MB or 128MB of RAM. The processor was officially rated at 4.5 [[Million instructions per second|MIPS]]. It was built to plug into a [[Micro Channel architecture|MicroChannel]] host system.

* The second version was built for a [[Peripheral Component Interconnect|PCI]] host system. It included 128 MB of dedicated memory as standard, and was still rated at 4.5 MIPS.

* The third version, referred to as a P/390E card (for Enhanced), included 256 MB of dedicated memory and was rated at 7 MIPS. It, too, was built for a [[Peripheral Component Interconnect|PCI]] host system. There was an extremely rare (possibly only ever released as pre-production samples) 1GB memory version of the P/390E card.