Subject: Re: [stella] a "pot" of confusion From: gentlben@xxxxxxxxxxxx Date: Wed, 26 May 1999 10:38:48 -0700 |
> This is completely correct from a programming point of view, but just a > couple minor electrical nitpicks... "Pot" is short for potentiometer, > which is a variable resistor and is pretty much all the paddle is. (The > pots don't discharge or recharge.) When you write the 1 into bit 7 of > VBLANK, a capacitor in the console gets grounded and drained. It stays > grounded until you write a 0 to that bit. Then, it starts recharging > through the potentiometer; the paddle read bit will go high when that > capacitor is fully recharged. How long it takes to recharge is determined > by how much resistance the paddle's potentiometer is currently supplying, > and that's how you get the paddle's position. yeah, i understood all along what the paddles are (but thank you for the technical explanation of it :) i knew a little bit about potentiometers, but i wasn't sure how to determine the position of the paddle through one bit, seeing as how, by comparison, the commodore 64's sid chip has a 8 bit register for reading a value (0-least resistance, 255-most resistance) or whatever... dee -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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