Virtual PC emulates a 32-bit Intel Pentium II processor (but virtualizes the host processor on Windows versions) with an Intel 440BX chipset, a standard SVGA VESA graphics card (S3 Trio 64 PCI with 4 MB Video RAM, adjustable in later versions up to 16 MB), a system BIOS from American Megatrends (AMI), a Creative Labs Sound Blaster 16 ISA PnP (native Vista audio when Vista acts as host and guest), and a DEC 21041 (DEC 21140 in newer versions) Ethernet network card.

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http://en.wikipedia.org/wiki/Virtual_pc#Emulated_en vironment