Subject: Re: [stella] watching the processor run From: Chris Wilkson <cwilkson@xxxxxxxxxxxxxxxx> Date: Fri, 29 May 1998 10:52:58 -0700 (PDT) |
> Erm, what? The energy capacity? I think this depends on the capacity of > the cells you use. You can't say in general "the capacity of lead-acid > batteries is higher than that of NC ones" or vice-versa. Both are > available in different sizes and capacities. I don't know what you're > comparing here. Yah, I should have said energy density. Of course the CELL density is a lot higher too ;) So if the energy density is higher then the energy capacity will be higher for cells of the same size. Good point. The cells I use are 2.0AH, BTW. About the size of a "D" cell, a little longer. > Well, in fact I tried it with the NC battery of my RC car, giving 7,2 > Volts. The 300 mA was measured with a multimeter hooked between the > battery and the 2600. It was infact somewhat below 300 mA. So, assuming > the battery had 1,4 Ah (I think they were sold with this capacity then), > you can play about 4-5 hours with one charging. Note that the voltage > will stay ABOVE 7,2 volts during most of the time, unlike > one-way-batteries, saying 1,5 Volts on it, but going below that very > soon. Yes, Nicads have basically a piecewise linear voltage/charge function. It's relatively flat until they discharge to a certain point, then they die. Quickly. Lead acids cells have a simple linear voltage/charge function. So as soon as they start discharging, their voltage starts dropping. But this is A LOT slower than carbon/zinc or alkaline batteries. When I ran it for the 5 hours, I had experienced the early stages of color loss. But it was only noticable by looking at an o'scope. I'm guessing I probably could've squeezed another hour out of them. I'll try to test it this weekend. > Of course, you need additional batteries for the screen... Yep. What I'd really like to do is hook up a color LCD screen. But that's way too time consuming at this point. > There this "portable 2600 clone" comes to mind. I think it had a battery > compartment. Does anybody know what type of cells, and how many, were > used, and when this one would "give up", or if they did something to > reduce the current it needed? I don't know anything aobut it, but I suspect that they would have done some re-engineering while they were at it. There are a couple of places that the 2600 could save on power. One really nice thing about nicad batteries is the fact that 4 of them together can make up a well regulated logic power supply. At 300mA, that saves 1.2 watts just from the internal regulation! The video circuitry can be cleaned up some, but there's a limit. You're stuck with the TIA, 6507, and RIOT. Although you could probably use a super low power 6502 successfully. Hmm...I see one of my 2600 jrs undergoing some major surgery pretty soon. :) -Chris -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html
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