I just downloaded the source, and after much scrounging around I found my old Borland 3.1 compiler.. I built the un.exe, and it does the same thing.. blank screen, and off to nowhere... so I started to add some printf's... Such as this bit in ken\main.c craftproc(); printf("main.c craftproc()\n"); initdevices(); printf("main.c initdevices()\n"); cinit(); printf("main.c cinit()\n"); binit(); printf("main.c binit()\n"); and I modified dmr\cov.c initvid() { // if (video==1) // (gdt_beg+6)->base_l =0; outbyte (VIDCA,VIDCSTART); outbyte (VIDCD,0); outbyte (VIDCA,VIDCEND); outbyte (VIDCD,14); outbyte (VIDCA,VIDADDRL); outbyte (VIDCD,0); outbyte (VIDCA,VIDADDRH); outbyte (VIDCD,0); // clear_screen(vd_attr); cosilence(); } so I could see some more.. it seems to initialize ok under virtual PC.. I think the next thing is to dig for some more info on the 1st task.. My Lyons book is somewhere as I want to create a dummy task that prints "a", and a second one that prints "b", so I can test the scheduler and get "abababababba" or something like that.. Another thing I noticed after trying to build the userland is that crt0.asm is missing.. I'm too much of a newbie to construct that though.. Anyways I'll try to get further this weekend either with my Lyons book, or with v6 on simh.