The slow motion thing can be found in BEEBUG, Volume 2 No. 6, p31: <a href="http:&#x2F;&#x2F;8bs.com&#x2F;beebugmags.htm" rel="nofollow">http:&#x2F;&#x2F;8bs.com&#x2F;beebugmags.htm</a><p>It does overload the system with interrupts, by making the (normally 100Hz) timer interrupt that the OS uses occur a lot more frequently.