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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 96MB daughter card for a combined total of 128MB of RAM. The processor was officially rated at 4.5 [[Million instructions per second|MIPS]]. It was built to
* 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.
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