deNULL/DCPU-16 — pull request #29 by a1k0n (2012-05-19 16:52:41+00:00)
Title: Fix disassembler.

Ops were processed in the wrong order, and the 'b' op needed to not be
processed at all for special instructions (opcode=0). Also, only the
'a' op gets short immediates -1..0x1e.