The aging power-challenged Voyager 1 spacecraft suffered another glitch 2 weeks ago – it stopped calling home on its regular channel. Here is the sequence of events that transpired -
Oct 16 – Command sent to turn on a heater
Oct 18 – X-band signal lost; team surmised that the power-overload triggered the fault protection system and Voyager switched to a low-rate low-power X-band mode
Oct 18 – DSN looked for lower-rate X-band signal and found it
(contd)
https://blogs.nasa.gov/voyager/2024/10/28/after-pause-nasas-voyager-1-communicating-with-mission-team/
#Voyager
1/n
@elaterite @simonbp
Looks like the Voyager CCS computer had just 4k 18-bit words of plated-wire memory.
Instructions consisted of a 6 bit op code and 12 bit address. This permitted 64 instructions and 4K of direct addressing.
Average instruction cycle time was 88 us (11.4 KIPS).
13 registers incl an 18-bit accumulator, 12-bit program counter, 12-bit link register that pointed to the next address to be read, and a 4-bit condition code register.
https://ntrs.nasa.gov/api/citations/19880069935/downloads/19880069935_Optimized.pdf