Thanks for the pointers. Dxdiag override worked best for me. I also tried using RivaTuner but found Dosbox tends to hang when exiting some games. Many thanks for the help, much appreciated.

Dosbox runs fine on Win XP, but when I hit ALT + Enter for full screen I get "signal out of range" from my TFT monitor. I have tried using an old CRT monitor and full screen works fine on it. I suspect that Dosbox is using a refresh rate higher than the TFT will permit (75 Hz max), but cannot find …