Hello, all: For those interested, I hit a major milestone this evening. After a momentary flash of brillance (which come too few and far between I'm afraid :-)) I made some minor tweaks to the code relating to diskette images. Then, I loaded up an image of CP/M 2.2 for the Altair and fired it up. Well, don't you know it works! I got CP/M to boot on the emulator!!! I now have to try Altair Disk BASIC and Altair DOS. It's dog slow and for some reason I can see CP/M console output but it doesn't appear to receive console input. So, I'm stuck at the "A>" prompt. I guess it's time to slow the front panel updating again or try to optimize the processor code. I feel a 2.1 release coming... Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/