a few questions

Smidget · Post by **Smidget** » Thu Sep 04, 2008 8:10 pm

hey guys, long time no see.
well I have finally accumulated all the parts for my n64p EXCEPT
the battery. I know my batt. needs to bee 8-12 volts, but what is the accepted maximum in the ways of mAH? what will get me around 4 hours of play with an LCD'd PS1 screen? who has the longest runtime EVER? i wanna beat it. this is going to be a fun portable, and if all goes as planned, I'll have it started and done soon. ive noticed that most people start working and buy stuff along the way, buy I've bought all my stuff(except batt) and now I'm gonna get started.

also: i'm using a PSP analog stick, if anyone can shoot me a link to alternate n64 stick mods that would be great.

PS: what IS the power consumption of a n64?

evilteddy · Post by **evilteddy** » Fri Sep 05, 2008 3:53 pm

There is no maximum for Mah for batteries in a portable. What you want is either NiMH or Li Ion camera batteries. These are the two easiest batteries in my opinion to portablize. Here is my estimated power draw for the N64-

-7.2V*.1A = .72W(On the 12 V line)
-3.3V*1.5A = 5W (on the 3.3V line with expansion pack)
-7.5V*750mA = 6.5W(unmodded ps1 screen)
-2W (for a fan and other finishing touches and tolerances)

that's 14.5W. My Nintendo 64 has 2.4 Ah batteries at 11.1V that means that the current draw will be 1.3A in my case so my batteries should last for about 1:40 each (I have two and I swap them) which they did when they were new (but because I bought el cheapos from China one died and the other now does 1:30 run time).

If you want 4 hours of runtime then you'll need 60Wh of capacity. At 7.2V that is a bit over 8 Ah. There are very few 8Ah batteries so on to cutting load. LED modding the screen should around cut the consumption in half, say 400mA so the Wattage will be around 4W. Don't use an expansion pack and that cuts another 500mA at 3.3V so that will be 1.65W less.

With these energy cutting measures you can take power consumption back to 10W which means you'll need a battery which can do 40Wh as opposed to 60Wh. At 7.2V that is 5.5Ah which is perfectly manageable.

I hope I have helped you.

Smidget · Post by **Smidget** » Fri Sep 05, 2008 4:04 pm

thanks for the info.
now if I could just figure out the stick...

HBN · Post by **HBN** » Fri Sep 05, 2008 6:47 pm

Correct me if I'm wrong guys, but don't you need an aftermarket controller in order to switch out the joystick?

Standard Nintendo brand N64 controllers wont accept anything but the joystick thats on it, and only wired the way it currently is. Trust me, I've had a lot of problems with them with my projects (IE: My motion sensitive N64 controller...).

Smidget · Post by **Smidget** » Fri Sep 05, 2008 8:39 pm

I knew that I couldn't use a Nintendo controller, really I guess I know how to do it... maybe. If anyone has done it in the past with a psp analog, I would love some info.

eurddrue · Post by **eurddrue** » Sat Sep 06, 2008 8:09 am

http://forums.benheck.com/viewtopic.php ... ystick+mod
this was shockslayers guide on how to mod a third party n64 controller, I still haven't read the whole thing though, so don't ask me any questions about it

I also used the search button, so I think that some of the words are gonna be highlighted.