Short: SIM v1.71, lowlevel debugger and monitor.

SIM is a symbolic lowlevel debugger and monitor for assembly language programs.
It is completely independent of the OS, works on PAL/NTSC Amigas running a
MC68000/20/30/40 with OCS/ECS/AGA. It may be used to actively debug programs
which disable multitasking or go to the hardware, for postmortem debugging
of crashed tasks or programs and as monitor for quick looks at memory and
system structures.