amperage

It should be higher.  If you have the voltage right, the consoles will only pull what they need.  Just because you can support more doesn't mean you are forcing that current into your system.

thanks a bunch im new to this kinda thing and i was confused on the matter thanks again

see the gamecube and n64 use 12v but i need to change there amperage i plan to use resistors to achive this and with the nes an snes i need to regulate there voltage im gonna use a l7809 volt regulater and l7810 for them do you think this is gonna be a good plan

see the gamecube and n64 use 12v but i need to change there amperage i plan to use resistors to achive this and with the nes an snes i need to regulate there voltage im gonna use a l7809 volt regulater and l7810 for them do you think this is gonna be a good plan

You don't need to change their amperage.  You need to make sure your 12V line can handle the amperage they need, and they will only draw what amperage they need. 

Think of it like this, you plug in lamp to your wall outlet.  It will draw a certain current at 120VAC.  You unplug it and plug in your fridge, it will draw much more current, but still at 120VAC.  Your outlet provides what they need as long as it's able, it doesn't regulate the current in any way (until it gets overloaded).

As for the voltage regulators, just make sure they can support the currents you need.  I have no idea what the draw on the NES and SNES are.  Usually the regulators are rated in power, so take the input voltage minus the output voltage, that will be the voltage dropped across the regulator, multiply that by the estimated current needed to get the power the regulator will see.  You will probably need a heatsink, I imagine the NES and SNES draw over an amp.

ok ic thanks again ive ben tying to put this together for a wile now an was worried about the amperage but since i only have to worrie about the voltage thats good beacuse i undersand that part. the nes runs off 9v 1.3 amps and the snes runs of 10v 850 ma , i watched an episode of the ben heck show an was inspired to learn more about electronic circuits an decided to build this console thanks for the help i was lost on this again im new at this an need to learn more

I'd shoot for at least 2-2.5A on the 9V one and on the 10V one go for 1.5A.

Maybe these

9V - http://www.newark.com/stmicroelectronics/l78s09cv/ic-v-reg-2a-9-0v-78s09-to-220-3/dp/26M0570?Ntt=L78S09

10V - http://www.newark.com/stmicroelectronics/l78s10cv/ldo-fixed-10v-2a-15v-to-220-3/dp/26M0571?Ntt=L78S10

You might still need to heatsink, you'll have to test that.

http://www.newark.com/wakefield-solutions/274-1ab/heat-sink/dp/50B8304