A List of Cross-Assemblers for Retrocomputing

 In my retrocomputing projects with various processors I have used a number of cross-assemblers to build code. I've had to use several in order to support different processors as well as for compatibility with different software packages. For the most part they are similar, but have their own unique features and quirks.

I put this table together, mostly for my own reference, that others may also find useful. It is by no means a complete list -- just those that I have used.

Name	Author	Source	Supported Processors	Key Features	Comments
as9	Motorola, with changes by Albert van der Horst and others	https://home.hccnet.nl/a.w.m.van.der.horst/m6809.html	6809	macros	100% compatible with Motorola assembler
asl	Alfred Arnold and others	http://john.ccac.rwth-aachen.de:8000/as/	many (over 50)	Macros	I have used with several processors
asm6809	Ciaran Anscomb	https://www.6809.org.uk/asm6809/	6809, 6309	macros	Good choice if 6309 support needed.
cc65	John R. Dunning, Ullrich von Bassewitz, and others	https://www.cc65.org/	6502, 65C02	C compiler, assembler, linker, librarian	Supports several 8-bit computer platforms.
crasm	Leon Bottou	https://github.com/colinbourassa/crasm	6800, 6801, 6803, 6502, 65C02, Z80	macros	Included in most Linux distributions.
gcc	Richard Stallman and others	https://gcc.gnu.org/git/	Many	Compilers and assemblers	I used for 68000. Included in most Linux distributions.
lwasm	William Astle and others	http://lwtools.projects.l-w.ca/	6809, 6309	Cross-assembler and linker.	macros
vasmm68k_mot	Volker Barthelmann	http://sun.hasenbraten.de/vasm/	Many	Cross-assembler	I used for 68000.
z80asm	Bas Wijnen	http://savannah.nongnu.org/projects/z80asm	Z80	Z80 cross-assembler	Included in most Linux distributions.