Re: [stella] Y Adapter

Subject: Re: [stella] Y Adapter
From: "Glenn Saunders" <cybpunks@xxxxxxxxxxx>
Date: Wed, 13 Feb 2002 16:07:36 -0800


> The way SWCHA maps to the controller ports: > > [L] [R] <-PORT > 7654 3210 <-DATA BITS > 4321 4321 <-PORT PIN NUMBERS > RLDU RLDU <-JOYSTICK DIRECTIONS > 11XX 11XX <-X = driving controller grey code

Actually the last line is supposed to be:
XX11 XX11  <-X = driving controller grey code

There really is a lot of confusion over this!!


Read closely in these links. The references shift from left/right to up/down constantly:

http://videogames.org/html/2600Stuff/DrivingControllers

"
upper 4 bits (4-7): don't care
bits 2,3: high (logical 1)
bits 0,1: alternating gray code
"
"this could be emulated with the joystick by doing l&r -> l -> none -> r -> l&r
"



http://www.atariage.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=16&t=002845


"If you plug a Driving controller into an Atari 800 and read the values, you get:

15 - "center" (or no direction)
13 - down
12 - down + up
14 - up
"

"I can get the car to turn a little when I press 'W' and 'S' (up and down), but that's about it..."



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