i have been working on a PCI 5V DAQ card. there is a surprising fact that i have observed regarding the motherboard on which i am mounting the card. it is an old pentium-I 200MHz board containing both PCI and ISA slots (one of those legacy boards). when i mounted the card and checked power supplies, i found that 3.3V supply is simply not there. the PCI spex v2.2 defines 3.3V power supply fingers on the bus. hence i routed my board accordingly (it contains Spartan2 and platform flash mem which require 3.3V for Vcco).
is this a generic case or what? has anybody seen/worked on such boards? doesnt this board violate PCI standards?
now i will have to change the board. can anyone tell me what i should look for on the motherboard to ensure that it has both types of power supplies supported?