it's interesting to note: on the Amiga and c64 demoscene, i can cite a few examples of new demos (created after fpga blueprints for these systems) which push REAL hardware to the limit yet run fine on real machines. yet, because they do not play nicely with documented hardware timings and such - the code breaks fpga "hardware" and software emulatrs.
Please do name a few of these (new) demos.