Ti99 controller port problem

[jbot1975]

Just fired up the ti99 and the up direction doesnt work. 

 

B&W model.

Y adapter for atari joysticks. 

Alpha lock is up (Tested multiple times).

Atari joystick tested working on an atari 2600.

Both adapter sides tested.

Port tested with actual ti99 controller & same result.

 

I have no clue. 

 

[+arcadeshopper]

sounds like you've tried all the obvious things.. do all the keys work? is a key stuck? if they all work then possibly there is a broken trace/bad solder on the joystick connector or a bad encoder chip 

 

Greg

[+sixersfan105]

Yeah we're trying to sort this out. I sold him the computer and everything worked perfectly prior to shipment.

[Ed in SoDak]

Maybe you tried this: Does typing in Basic or XB with the caps lock up result in small cap letters? Then large cap letters when caps lock is down? Same for the shift keys? Would make sure none are stuck down or somehow shorted.

[jbot1975]

Shift keys work as well as all the other keys.

The up works sporadically after inserting the adapter 3-5 times but then the other directions will stutter after that. Tested on 2 different 2600 controllers & a ti99 controller.

Edited March 28, 2020 by jbot1975

[+arcadeshopper]

Bad adapter sounds like

Sent from my LM-G820 using Tapatalk

[+save2600]

Quote

Port tested with actual ti99 controller & same result.

 

...cold solder joint(s) that finally broke at the db9? To verify, maybe try holding the plug going into the system one way or another. If it's a bad solder joint, it'll likely work consistently while you're applying pressure to the plug up/down, whatever. 

 

 

[jbot1975]

1 hour ago, save2600 said:

 

...cold solder joint(s) that finally broke at the db9? To verify, maybe try holding the plug going into the system one way or another. If it's a bad solder joint, it'll likely work consistently while you're applying pressure to the plug up/down, whatever. 

 

 

Tried that too but couldn't get any difference out of it. I had an old sega master system that did that. 

[+save2600]

12 hours ago, jbot1975 said:

Tried that too but couldn't get any difference out of it. I had an old sega master system that did that. 

Wriggling or holding pressure isn't always a 100% failsafe test... joint could still be broken. If it were my machine, I'd open her up and reflow the solder joints at the connection, just to eliminate the possibility.

[+sixersfan105]

Closing the loop on this, the culprit was the Atari adapter. Anyone need a boxed TI-99/4A?