Saturn Launch Vehicle Digital Computer - Interrupts

Interrupts

The LVDC could also respond to a number of interrupts triggered by external events.

For a Saturn IB these interrupts were:

LVDC Data Word Bit Function
1 Internal to LVDC
2 Spare
3 Simultaneous Memory Error
4 Command Decoder Interrupt
5 Guidance Reference Release
6 Manual Initiation of S-IVB Engine Cutoff
7 S-IB Outboard Engines Cutoff
8 S-IVB Engine Out
9 RCA-110A Interrupt
10 S-IB Low Fuel Level Sensors Dry
11 RCA-110A Interrupt

For a Saturn V these interrupts were:

LVDC Data Word Bit Function
1 Minor Loop Interrupt
2 Switch Selector Interrupt
3 Computer Interface Unit Interrupt
4 Temporary Loss Of Control
5 Command Receiver Interrupt
6 Guidance Reference Release
7 S-II Propellant Depletion/Engine Cutoff
8 S-IC Propellant Depletion/Engine Cutoff
9 S-IVB Engine Out
10 Program Recycle (RCA-110A Interrupt)
11 S-IC Inboard Engine Out
12 Command LVDA/RCA-110A Interrupt

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