NEC Electra Elite 48/192 Features And Specifications Manual page 616

Electa Elite
Features and Specifications Manual
The MIFA-U10 ETU (with KMA(1.0)U installed) has an ACD-MIS
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output that works only when the MIFA-U10 ETU is installed in the ISA
slot. ACD is not supported by the Electra Elite 48 system.
When ACD-MIS and remote SAT PC programming are required,
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install the ACD-MIS in the ISA slot and the MIFM-U10 ETU in IF slot
1 or 2 in the B64-U10 KSU.
Issue 6
U - 17