CMD CQD-220TM problems

On Nov 7, 2011, at 8:05 PM, Glen Slick wrote: Right, so the GPIO register is that '273 next to U15. There's a '244 just to the left of that which serves as the buffer to the outside world. I can see the bits coming out of the '244 from the UART Rx (they're inverted, but the software expects that). I don't ever see anything coming out of the Tx, but the software definitely behaves differently (seems to crash, though there's no way to be certain; the LEDs start flashing at about 1 Hz) when something is plugged into the other side, and a cursory examination of the software on the 8086 side shows that it polls to see if it can see a UART idle at startup, so presumably it's trying to do something with it. I know the thing can address the GPIO register, because it's the same register (different bits) that handles the LEDs. - Dave