GabrielKnight123 wrote:I am going to buy some power adapters for a new ATX power supply to plug into an adapter to go to the AT motherboard but the ones I have seen on ebay only have two wires for the power button shouldnt there be an extra one? Also when I get the newer ATX power supply do I need to get one that has -5 volts for the ISA bus as all newer ones I know of dont have -5 volts.
The Power Switch connector only has 2 conductors.The intent of it is to use an ATX case and its soft power switch, one which only passes current when being pressed and is connected to the motherboard, with an AT motherboard, which has no power switch connector, and where the power switch actually controls the Power Supply.
For the -5V, it is not always required on AT motherboards. It is only required by specific ISA Audio Cards. In the event that you require it, you can either get an AT or early ATX PSU which provides -5V, or you can get one of the ATX to AT adapters which create -5V.
EDIT: To prevent future incorrect interpretation: The statement "For the -5V, it is not always required on AT motherboards." means that some AT motherboards do not require -5V, which therefore implies that some do. The statement "It is only required by specific ISA Audio Cards." means that there are certain ISA Sound Cards which require -5V to operate correctly, and that most do not.
MT-32 Old, CM-32L, CM-500, SC-55mkII, SC-88Pro, SC-D70, FB-01, MU2000EX
K6-III+/450/GA-5AX/G400 Max/Voodoo2 SLI/CT1750/MPU-401AT/Audigy 2ZS
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