There's been another release of SjASMPlus, the Z80 cross-assembler. v1.07 RC2 brings with it a few little bugfixes, and the addition of the "PENTAGON128" device. It's now also possible to save a .sna file from the assembler when you're working with the SPECTRUM48 device. These changes are in response to feedback over on the WOS forums, it seems.
Note that the documentation that comes with the Win32 binary package is out of date (it doesn't cover RC2 yet), so you'll want to download the document package too.