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===S/390 Processor Card===
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 * The second version was built for a [[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 [[PCI]] host system.
===R/390===
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