RCA Spectra 70 - Page 115

General Description
Format
(51)
Condition Code
Interrupt
Action
Notes
Privileged
Instructions
• This instruction effects an idle mode within the processor by con-
tinuously branching back to itself.
80
o 7 8 15 16 19 20
31
• Unchanged.
• Privileged operation.
• 1. When this instruction is operating with the I field zero, the Idle
light of the console is on.
2. Any interrupt occurring while the idle mode is in effect is taken
(if permitted via the Interrupt Mask register).
3. The Bl and Dl fields of this instruction must be zero.
4.
For normal programming, the I field must be zero. For maintenance
programming, bits within the I field, have the following meaning:
Bit 15 = I-set alarm inhibit.
Bit 14 = I-reset alarm inhibit.
Bit 13 = I-set inhibit simultaneity.
Bit 12 = l-reset-inhibit simultaneity.
106