@uhoh- according to wikipedia, the AP-101B used magnetic core memory (because it was fully matured technology in the late 1970's).
I'd only heard of core memory used on spacecraft within the context of the Apollo missions to the Moon. Now that I can read in this archived documentation, (PDF) that core memory was used in flight computers in the following decade, so I'd like to ask:
Question: Has magnetic core memory been used beyond cis-lunar space?
The TC computer utilizes an 8,192 word by 8 bit destructive readout core memory. The memory has a 2.5 microsecond read-write cycle time. Each cycle consists of a read followed by a write operation. The computer initiates a start memory every three microseconds. The access time of the memory is approximately. 9 usec. A coincident current (3-D) selection scheme is utilized. The memory array requires our memory mats packaging two bits per mat. Operation is possible over the ambient temperature range of -55 C to +l00C.
The main storage array is fabricated from core planes which are a militarized version of planes used on the IBM System/360. Each plane has 16,384 cores. Planes are conformally coated and foam padding is placed between planes for environmental protection of cores.
Read Only Storage is implemented with a microminiature linear ferrite 7/12 (ID/OD in mils) magnetic core. The basic core plane contains 512 by 70 cores. A core is located where a "1" bit is stored and a core is missing where a "0" bit is stored. Two wires thread each core: one drive winding and one sense winding. Two planes are required for the ROS. Monolithic circuits are used in the decode. driver. detector and latch portion of the ROS.