Installation racks have three iterations (dates approximate):
1979-1986: CD80 Original, AMX only, used TA4 data connector
1986-1992: CD80 AE (Advanced Electronics), AMX (XLR4) or DMX (XLR5)
1992-2009: CD80 SV (Supervisor), primarily DMX, although AMX still supported
Dimmer modules for Original and AE racks are compatible with each other, but not with SV racks. Dimmer packs did not use removable dimmer models. Control cards are not compatible between racks and packs.
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