Some of you may be familar with Sara, the freeware Apple /// emulator I wrote for the Mac several years ago. I am thinking about doing some more work with it, trying to get some of the remaining bugs out. I'm to the point where I need the assistance of someone very familar with the Apple ///'s inner workings. Some programs (like the System Utilities) boot up fine. But Business Basic, for example, loads up, then reports an error if you try to run a Basic program. I suppose this could be due to a bug in my implementation of the memory addressing, or something similar. If I run the Apple /// Confidence Program "Machine Configuration", it passes, except for errors on the timer1, timer2, and shift reg. Anyone interested in lending a hand? The URL for Sara is http://www.blackcatsystems.com/software/sara.html Chris -- Black Cat Systems http://www.blackcatsystems.com Macintosh software - science, audio, health, amateur radio, and more.