Actually, when I look back over the source I see I was wrong about what I did to get it to compile (I did this shortly after I got my iMac about five weeks ago so was working on memory). I got the message "PIC register '%ebx' clobbered in 'asm'". So I did initially try to do what the patch does ( …

I've played about with this and managed to get DosBox compiled on my Intel iMac - it's definitely a big improvement. Using the current dosbox-0.63 under Rosetta, I can't get CPU settings above 3500 with my favourite old DOS game (Betrayal at Krondor) before reaching 100% CPU (ie. one core). With my …