Posted Fri Apr 14, 2017 1:47 PM
Can someone link me to pinouts on how to set up a Genesis controller as a direct plug-in joystick replacement for the TI?
I do not want to use an adapter.
Thanks!
I would be limited of course since the TI only uses one fire button.
The pinouts for the Sega Genesis controller are
You can map the pins on the 99/4A joystick from
Should be able to wire the pins up by matching the correct ones on each side.
Posted Fri Apr 14, 2017 2:02 PM
I think if you try to do this on an unmodified Genesis controller you'll run into the problem that only Up and Down will work. The rest of the switches go through the mux chip in the controller and that won't work without 5v power on pin 5. You can modify the controller to bypass the chip and connect the switches directly instead. http://smalltimer.ne...d/segactrl.htmlhas instructions for doing this to produce an Atari-style pinout. You could follow those instructions and then try switching the pinout on the cable around to match the TI-99.
Posted Fri Apr 14, 2017 4:30 PM
Posted Fri Apr 14, 2017 5:40 PM
Posted Sun Apr 16, 2017 9:38 PM
Best console controller out there IMHO.
Posted Wed Apr 19, 2017 9:41 AM
Posted Wed Apr 19, 2017 9:42 AM
The Genesis controller is already an Atari-style controller with zero conversion needed. Sega was smart enough to make them plug-in compatible.
Since the open market has so many Genesis variations (Atari options, Standard Genesis, Sports Trackball, Arcade Multi) and they all work with a cheap $10 TI-to-Atari converter dongle, why mess with the pin outs?
Why not just get the TI-to-Atari pin out dongle and give yourself tons of options?
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Posted Wed Apr 19, 2017 11:05 AM
Posted Fri Apr 21, 2017 5:31 AM
I wonder if they just need the +5V power that is normally on an Atari joystick port? That's why an Atari Trackball doesn't work on a TI either--give it power on that pin from an external source and see what happens. . .
Posted Fri Apr 21, 2017 7:45 PM
I wonder if they just need the +5V power that is normally on an Atari joystick port? That's why an Atari Trackball doesn't work on a TI either--give it power on that pin from an external source and see what happens. . .
i can test this for you.. i have some controllers will have to dig them out
Greg
Posted Sat Apr 22, 2017 12:40 PM
Posted Mon May 8, 2017 7:35 AM
Genesis controllers have a parallel to serial shift register chip inside that bring all the buttons encoded back as a serial signal, except the dpad.
For my TI and Tomy Tutor, I remove the chip and just use the switches.
The chip is surface mount so I do things like take a dremel and grind all the traces I don't want.
For best results on a 4A, use the controller's screwdriver interface.
Or, use a little PIC chip to talk to the sega device and pretend to be the TI device.
-M@
That's not quite correct--the NES and SNES have a shift register. The Genesis has a quad 1-of-2 data selector, a 74LS157. You supply 5v on pin 5 to this chip and keep pin 7 high if you want to read the four directions and the B and C buttons. Drop pin 7 and you can read Start and A.
This is NOT actually Atari-compatible. Atari provides +5v on pin 7. Pin 5 is one of the paddle inputs, which the electronics nerds in the group can tell you is not harmful to the RC charge timer used to read the pot on the Atari. The reason these work on the 2600 is because putting 5v on pin 7 inadvertently powers the TTL chip. The pot turned all the way to one side would do the same thing.
The console has NC joystick pins and any one of them could be wired for +5, but it would be a mod you'd have to consciously choose to make.
Posted Mon May 8, 2017 9:41 AM
Posted Mon May 8, 2017 10:14 AM
The usual Atari adapter is all you need, if pin 7 has +5 on it.
I'm actually considering wiring up some NES controllers to work on the TI, Atari (SMS mode) and possibly switchable to Atari 7800 mode.
Posted Mon May 8, 2017 10:33 AM
The usual Atari adapter is all you need, if pin 7 has +5 on it.
I'm actually considering wiring up some NES controllers to work on the TI, Atari (SMS mode) and possibly switchable to Atari 7800 mode.
Posted Mon May 8, 2017 5:43 PM
This messaging is what I'm trying to prevent. I believe it comes from a failure to understand that on a 4A there is no power or GND lines at the Joystick port. And 'the usual' atari adapter is a passive device, that does not bring power to the table for us 99ers.
-M@
I realize the TI has not got +5 to the port. In fact I said so three messages above. If you add an external powersupply, it'd work. If you don't, it won't. That's why I'm planning to rewire some NES controllers as SMS controllers--those will.
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