That is a good idea.Smonson wrote: ↑Mon Sep 10, 2018 3:35 am To eliminate the possibility of power supply issues, could you try running the machine with the stock shifter installed, but with the FPGA board connected to just +5, ground, and vysnc? If possible, from somewhere connected close to the shifter socket. Then it should run through video generation just by itself and possibly introduce power supply or ground noise.
In fact, both shifter and FPGA could actually be soldered on top of each other ? If Troed solders a socket on top of the shifter, plugs the shifter into the MB, then the FPGA into the socket.. then he can run both at the same time ? If both outputs work, that would be interesting..
If troed has a diagnostic cart, might be worth running with that to see if any bad bits in RAM test show up before the reset.. I'm thinking bus loading issues when the FPGA is installed...
Might also be worth running VSYNC via a 100R resistor as well...