IMS IMSAI 8080 User Manual page 143

For a more complete description of the functions of
the status bits, reference should be made to the Intel
8080 Micro Computer Systems User's Manual.
RUPT ENABLED indicator is turned on whenever the
interrupts are enabled into the 8080 processor by the
INTERRUPT ENABLE INSTRUCTION.
off either by an interrupt occurring and the processor
acknowledging it, or by the instruction to disable
interrupts. The HOLD indicator light is lit whenever
a Special-purpose input/output card is holding the
processor so as to gain direct access to the memory
on the system bus.
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CP-A
User Guide
Revision 1
The INTER-
This light is turned