The IDT77904 and IDT77905 are designed to provide stable reference platforms for evaluation, design, and production of a 155Mbps NIC. The IDT77904 provides a fiber media physical (PHY) interface; the 77905 supports Unshielded Twisted Pair, Category 5 (UTP-5) cabling. Otherwise identical, they both feature complete PCI-bus ATM NIC functionality, plugging directly into PCI bus expansion slots. COMPATIBILITY AND CONFIGURATION The board is designed for use in PCI systems, which may include PC compatibles, MIPS, Alpha, Windows NT systems, future PowerPC Macintosh systems, and so on. It supports the 32 bit, 33 MHz, 5V part of the PCI spec, although this also permits operation in a 64-bit, 33 MHz, 5V PCI slot. OVERVIEW