MSDOS UNIX et.c. OTHER OSses, you of course need to recompile. Glance at HACK.TXT to glean some information from that . If your machinery runs MSDOS or UNIX your chances are pretty good (no promises made (har har)). TOS INSTALLATION DOC This is a bit stupid, since you are reading this, you probably have already unarced everything and put everything in its right place. Just to make sure that everything is OK, let me tell you how I would have done it. I recommend that you unpack the archive somewhere near root on a partititon with about 1.5MB to spare, possibly less if you keep the sources arced. 1.5MB if you want to do some source hacking too, else you need much less. Note that the source files will go into the current directory. Maybe not what you want. If you throw away everything but the binaries and the libraries, you can fit NASM on a single sided disk. (SEE COPYRITE.TXT for copy restrictions of incomplete NASM copies) The structure I have on my disk looks like this ASM65\ "Sources and Binaries" DEMO\ "Demo .S65 files" DOC\ "ASCII documentation files" HEADER\ "Include files for NASM65" LIB\ "Object files and libraries for NLINK65" LIB\SRC\ "Library sources" SUPPORT\ "Font files" SHELL USERS 1 - Put the binaries in \bin or whereever you store your binaries. Make sure that you got your PATH right. [printenv] 2 - Put the include files and the libraries, where you think they should belong on your system. Set the environment variables INCLUDE and LIBRARY to the header path and the library path respectively (can be the same of course). like : setenv INC65 'c:\asm65\header' setenv LIB65 'c:\asm65\lib' That's it!! DESKTOP USERS Copy all header, object and library files to the directory the sources you will double-click on reside in. Install NASM65.TTP as a .TOS application for filetype .S65 Install NLINK65.TTP as a .TTP application for filetype .O65 Install DEMAC65.TTP as a .TOS application for filetype .M65 Install DISASM65.TTP as a .TOS application for filetype .COM Save your DESKTOP arrangement. Better yet, get a shell.