> 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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