From Picodoc Corporation:
The picoViewer Disassembler series for 8-bit embedded and robotics systems supports Palm OS v.3.0 and higher. This 6502 microprocessor version is functional and not time-limited, allowing a thorough evaluation of this unique technology. With picoViewer, you can explore and trace code with the interactivity and convenience of a handheld device. You can work on the bench, in the field, anytime, anywhere.