The hardware primer is here: Matrix-1000 Hardware Primer - Google Docs
With the firmware, I am working on a so-called info file; a text file with all the additional information a disassembler may use to produce code that humans can actually understand.
The info file is very much work in progress - still reorganising the labels I got - and can be found here:
The disassembly owes most of it to a generous code donation by one of the original M1000 reverse engineers, who asked to stay anonymous. (You'll guess who it is anyway;)
A ready-to-use-disassembled assembler code file of v1.13 can be found in my dropbox - but that may lag behind the info file.