vasm released in the Version 1.8j.

vasm is a portable and retargetable assembler to create linkable objects in various formats or absolute code. Multiple CPU-, syntax and output-modules can be selected.

Many common directives/pseudo-opcodes are supported (depending on the syntax module) as well as CPU-specific extensions.

The assembler supports optimizations (e.g. choosing the shortest possible branch instruction or addressing mode) and relaxations (e.g. converting a branch to an absolute jump when necessary).

Most syntax modules support macros, include directives, repetitions, conditional assembly and local symbols.

Changes:

* New CPU backend for the PDP-11 architecture.
* Fixed alignments in relocated-org blocks within a section.
* 6809: 16-bit branch with a negative distance of 127 bytes (-130 encoded) was erroneously optimized to 8-bit branch (-129 encoded). Fixed.
* 6809: .dpage directive conflicts with .dpage section in std-syntax and was renamed to .direct.
* 6809: Support label differences in immediate addressing modes, which generate a pc-relative relocation.
* m68k: Fixed inappropriate cpu-type errors, when using directives or macros starting with "mc", "mcf" or "ac".
* m68k: Illegal opcode extensions should also be reported in Devpac- compatibility mode. Illegal opcode extensions for unsized instructions are still ignored with -devpac.
* mot-syntax: pushsection and popsection directives.
* mot-syntax: msource directive to control source level debugging within a macro (submitted by Soren Hannibal).
* mot-syntax: if1, if2, ifp1 directives for compatibility with a warning.
* oldstyle-syntax: org $addr works again for Z80.

http://sun.hasenbraten.de/vasm/