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Some tech. info on the Voyager FDS computer –
- There was a backup FDS unit but it failed in 1981.
- Custom CMOS CPU - 36 instructions. 80 KIPS, 115 kbps data rate.
- 128 registers, kept in memory.
- CMOS memory, a first in space, 8KB.
- No separate memory for program storage vs execution. The CMOS memory is non-volatile kept powered on by the RTG.
- DMA access to memory by hardware. Instead of “cycle-stealing”, the instructions indicated cycles where DMA can occur.

https://ntrs.nasa.gov/api/citations/19880069935/downloads/19880069935_Optimized.pdf
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