HeadcolorsTV Posted November 21, 2019 Share Posted November 21, 2019 Okay everyone, this one I'm certain is something I'm doing wrong because the circuit is so simple. It's the GamesX Saturn controller schematic, and I'm having a difficult time getting the console to recognize it. Key things to point out: 1. I'm using an OEM controller cable from a working gamepad. 2. The schematic names the ICs as TC74HC153A (Toshiba); I am using 74HC153E (Texas Instruments, PDIP). 3. The console behaves the same with the project controller plugged in as when there are no controllers plugged in. When an Action Replay cart is in, the menu instantly goes to Select Game > Search > cursor goes down repeatedly to the "." character on the search input interface and keeps trying to go down (so it rapidly stays on "." and blinks infinitely). Again, this behavior is the same as when no controllers are plugged in. 4. Using a breadboard--the same one I got the PS1 controller schematic to work on. All rails are properly connected and "jumped" in the middle of each rail. 5. I have double- and triple-checked each connection. ICs are getting correct voltage and grounding. 6. I have tried 47K and 10k arrays, same result. 7. Pin 3 and 13 of U1 are kept low. Pin 3 of U2 is kept high in the array. 8. I have several 153s, so I've tried swapping both chips. No success. 9. Yes, I've made sure other gamepads work in port 1. They do. Has anyone else attempted this schematic and encountered the same issue? Any help is appreciated, thanks! Quote Link to comment Share on other sites More sharing options...
Bruce Tomlin Posted November 22, 2019 Share Posted November 22, 2019 22 hours ago, HeadcolorsTV said: 5. I have double- and triple-checked each connection. ICs are getting correct voltage and grounding. This is kind of a dumb question, but are you sure you connected power to the '153s? Vcc to 16, GND to 8, it's not in the schematic, so I had to mention it. Quote Link to comment Share on other sites More sharing options...
HeadcolorsTV Posted November 22, 2019 Author Share Posted November 22, 2019 Just now, Bruce Tomlin said: This is kind of a dumb question, but are you sure you connected power to the '153s? Vcc to 16, GND to 8, it's not in the schematic, so I had to mention it. Haha, no problem. Yes I’m sure. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted November 22, 2019 Share Posted November 22, 2019 (edited) What are you connecting the common of the resistor arrays to? The schematic doesn't show such a connection, but it looks like it should be VCC. Edited November 22, 2019 by ChildOfCv Quote Link to comment Share on other sites More sharing options...
HeadcolorsTV Posted November 22, 2019 Author Share Posted November 22, 2019 4 hours ago, ChildOfCv said: What are you connecting the common of the resistor arrays to? The schematic doesn't show such a connection, but it looks like it should be VCC. Yep. 5v. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted November 22, 2019 Share Posted November 22, 2019 What voltage are your Y lines outputting? If you disconnect D0-D3, does the autofire stop? Quote Link to comment Share on other sites More sharing options...
HeadcolorsTV Posted November 22, 2019 Author Share Posted November 22, 2019 39 minutes ago, ChildOfCv said: What voltage are your Y lines outputting? If you disconnect D0-D3, does the autofire stop? Lemme check that out later today. Gotta hook everything back up (got 2 projects going on at once). Quote Link to comment Share on other sites More sharing options...
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