The first thing is to find some kind of free assembler, and there seems to be a myriad of choices. The writer of the following post raves about the "lwasm" assembler that is part of "lwtools", so I am going to start there.
dnf install lwtools ( gives me lwtools-4.14-3.fc27.x86_64.rpm )Now I have lwasm in /usr/bin/lwasm and it compiles the short bit of code the fellow gives in the blog above and yields the same messages. This was easy. No man page, but the --help option is helpful:
[tom@trona ~]$ lwasm --help Usage: lwasm [OPTION...] INPUTFILE lwasm, a HD6309 and MC6809 cross-assembler -3, --6309 Set assembler to 6309 mode (default) --6800compat Enable 6800 compatibility instructions, equivalent to --pragma=6800compat -9, --6809 Set assembler to 6809 only mode -d, --debug[=LEVEL] Set debug mode -b, --decb Generate DECB .bin format output, equivalent of --format=decb -D, --define=SYM[=VAL] Automatically define SYM to be VAL (or 1) --depend Output a dependency list to stdout; do not do any actual output though assembly is completed as usual --dependnoerr Output a dependency list to stdout; do not do any actual output though assembly is completed as usual; don't bail on missing include files -f, --format=TYPE Select output format: decb, basic, raw, obj, os9 -I, --includedir=PATH Add entry to include path -l, --list[=FILE] Generate list [to FILE] -m, --map[=FILE] Generate map [to FILE] --obj Generate proprietary object file format for later linking, equivalent of --format=obj -o, --output=FILE Output to FILE -p, --pragma=PRAGMA Set an assembler pragma to any value understood by the "pragma" pseudo op -P, --preprocess Preprocess macros and conditionals and output revised source to stdout -r, --raw Generate raw binary format output, equivalent of --format=raw -s, --symbols Generate symbol list in listing, no effect without --list --symbols-nolocals Same as --symbols but with local labels ignored -t, --tabs=WIDTH Set tab spacing in listing (0=don't expand tabs) --unicorns Add sooper sekrit sauce -?, --help give this help list --usage give a short usage message -V, --version print program versionI start out using: lwasm -9bl -p cd -oNEW.BIN mycode.asm and using the sample code in the blog post by Glenn Parker and get his results, so it looks like this is the package I want. Amazing that fedora includes 6809 development tools in the available packages.