This program is 
          pretty good and keeps getting better and better. At the moment the " 
          Save Binary " function is not available yet, but the run time file 
          has the memory contents with an offset of 198h. Also, it is free.
         
          The 
            Telemark Assembler (TASM)
            Good assembler for DOS. Supports Z80, 6502, 6800/6801/68HC11, 
            6805, 8048, 8051, 8080/8085, TMS32010, TMS320C25 TMS7000 and 8096/8019
            Download the latest version (3.1) : tasm31.zip 
            (184 Kb)
        
         
          MicroAsm
            MicroAsm is a Windows 9x & NT editor with support for MS-DOS command-line 
            tools and Win32 console programs (such as AVRASM and TASM). A must 
            for TASM users !
            With MicroAsm you can: 
        
        
          - Create and edit 
            text files. 
- Run the files 
            through your favorite command-line tools. 
- Automatically 
            highlight lines containing errors. 
 
          Download the latest 
            version (3.1) : uasm10.zip (324 
            Kb)
          SDCC
            SDCC is a Freeware , retargettable, optimizing ANSI - C compiler. 
            The current version targets the Intel 8051 and recently the Zilog 
            Z80 based MCUs. SDCC can be retargeted for other 8 bit MCUs or PICs 
            and some day soon will be. The  entire source code for the compiler 
            is distributed under GPL.
          Tpasm
            Tpasm is an open source assembler. It currently supports: Z80, Motorola 
            6805, Intel 8051 8031 8032 8051 8052, Microchip PIC, Atmel AVR 
          Z80-ASM 
            by Petr Kulhavy
            This is an official homepage of the Z80-ASM. Z80-ASM is compiler of 
            the Z80 CPU assembler. It runs under DO$ and Linux. It's written in 
            C. 
          Simple 
            Z80 assembler and MicroProfessor simulator
            This simulator is a Java 1.1 applet. You need to be using either Netscape 
            4.5 (or later versions) or Internet Explorer 4.0 (or later versions) 
            to run the simulator. Applets cannot access local files but, on Windows, 
            you can write source code in Notepad files and use copy/paste to insert 
            source code into the applet TextAreas (use the right mouse button 
            to access the copy/paste menu).