50 Hz PAL and 60 Hz NTSC by default versions available. 50/60Hz mode can be switched by software, although switching a PAL Amiga to NTSC mode produces a 60Hz PAL display, and switching an NTSC Amiga to PAL mode produces a 50Hz NTSC display. Usually this is enough for software that relies on a particular format.
hardware switchable low-pass audio filter. (cut/join a track, many people built switches). This was software switchable on later models. sure it wasn't software switchable on the 1000?!
... 1973)
March 6 - Joseph Schmidt[?], tenor (+ 1942)
March 7 - Reinhard Heydrich, Nazi official
March 20 - B. F. Skinner, behavioral psychologist (+ 1990)
March 23 - ...