detect proline

[ulao]

I need to act like a 7800 controller. I know the proline has a few resisters in there and hold a line lo. But what does a game like Xevious do to detect it. I tried a few things but no luck.

 

I'm using a micro controller to act as a 7800 but not sure what the 7800 games are looking for.

 

[Roy]

Here's some info from THIS link: (Page 17 of the PDF)

 

You can read single-button joystick button state from these TIA registers:

Register Button Bit
----- -------- -----
INPT4 player 0 d7=0 if pushed
INPT5 player 1 d7=0 if pushed

If your game requires both joystick fire buttons, you need to turn on two-button mode by performing
this initial setup:

LDA #$14
STA CTLSWB ;set bits 2 and 4 of PORT B for output
LDA #0
STA SWCHB ;output 0 on bits 2 and 4 of PORT B After which, the joystick button state can be
read from these TIA registers:

Register Button Bit
----- -------- -----
INPT0 player 0, right button d7=1 if pushed
INPT1 player 0, left button d7=1 if pushed
INPT2 player 1, right button d7=1 if pushed
INPT3 player 1, left button d7=1 if pushed

Reading in two button mode when the console has a one button joystick plugged-in isn't
recommended, and may be harmful to the console if done for an extended period. A two button
game should check for one button presses via INPT4/5, and if detected the game should turn
off two button support for that joystick by setting the appropriate SWCHB bits high.
(D2=player 0 joystick, D4=bit 2, player 1 joystick)

 

Is this what you are looking for? I'm not sure how this is handled if you are looking for 7800Basic info. All I know is that this is how games handle it.

Edited April 3, 2015 by Roy

[ulao]

It helps yes but is from the reverse end, thus makes it more complex. Basically I need to simulate what you just said ensuring I don't harm the console. I'm not 100% sure what buttons go to what registers. Though if I stare at this long enough it may become clear.

 

-- Hmm, in that link d7 is directional right, or it would seem, that confuses me.

Data Direction Player
----- -------- ------
D7 right P0

 

 

The perfect info for me would be something like. If db9 pin 'x' is held lo (pressed -5v) permanently, then the system sees this as a pro-line controller, and so on and so forth. If you don't know of anything like that I'll start hurting my brain.

Edited April 3, 2015 by ulao

[CPUWIZ]

It would help if you explain what you are actually trying to do.

 

Are you trying to make something like my DS2 adapter?

 

http://atariage.com/forums/topic/231855-atari-26007800-dualshock-2-adapter-part-deux/?p=3155898

[ulao]

It would help if you explain what you are actually trying to do.

 

Are you trying to make something like my DS2 adapter?

 

http://atariage.com/forums/topic/231855-atari-26007800-dualshock-2-adapter-part-deux/?p=3155898

I did?

 

I'm using a micro controller to act as a 7800

 

I don't know how to say it better? I guess it would be the same approach as that ds2 to 7800 but would have to prowl thru the code, if it is available. The more I consider this, It may be best cutting up a 7800 controller board and using its internals or just replicate it on a small board. Just seems unnecessary as the micro controller could do all of that by itself if I know exactly what to do.

Edited April 3, 2015 by ulao

[ulao]

Ok, examining the board and info electronically.

 

Some sources say no power

http://rtfm.vtt.net/pinouts/data/JoystickAtari7800_pinout.shtml.htm

 

others say you need power. Opening my controller shows no power connected. I have two resistors showing about 616 ohms. and another component that is in line with ground.Sources call it a diode but current from my multi meter flow both ways, maybe its a zenier? Some how the game knows this is a 7800 2 button controller. I tried to replicate the board with no luck. The buttons with resistor do nothing. I saw a non asci schematic on the net at one point but can not relocated it.

 

I thought maybe the 7800 was detecting the resistance in button 1 and 2 but that is apparently not the case.

 

 

ok Prodos8 says: "I believe its an inductor??? What ever it is its not needed for the circuit to work as I've made several RSI:7800 sticks & NES:7800 pads without it that work just fine. Yes, the two resistors are 620ohm. Something close to that will work as well." http://atariage.com/forums/topic/127507-my-r-type7800-stick/

Edited April 4, 2015 by ulao

[ulao]

Ok here is what I needed.

http://atariage.com/forums/uploads/monthly_06_2014/post-10599-0-73575400-1402217871.jpeg

Had no idea the button like up like that. Works now.