Hello, all: Another crazy project... While working on my old-DOS decompilation project, I've found that it would be handy to have some sort of ICE hardware/software to watch the boot-up sequence, examine specific registers, test code fragments, etc., without crashing my PeeCee. I've been using Debug and testing code fragments to watch changes in the registers. Can anyone point me to a GNU/shareware software-based ICE program, much like NuMega's Soft-ICE Windows, that can do this for DOS? Is it even possible to use a software-based ICE in this instance (because it's before DOS boots). How about this...how about a virtual PC running under OS/2 or Windows NT? It would have to be re-bootable (without crashing the host operating system) and support hot-key break-to-debugger. Sort of like a cross between the vMac Macintosh emulator and WDEB386 (the Windows Kernel debugger). It would be odd to emulate an 8088 on a Pentium 233MMX...hmmm...sounds like a project. Any thoughts??? Rich Cini/WUGNET &lt;nospam_rcini(a)msn.com&gt; - ClubWin/CW6 - MCP Windows 95/Windows Networking - Preserver of "classic" computers <<<< ========== reply separator ========== >>>>>