HF Packet in Star Trek IV: The Voyage Home

Here is an interesting anecdote about packet radio. In the 1986 motion picture entitled Star Trek IV: The Voyage Home, a 23^rd century communication device intercepts a radio packet (view here the movie segment in which this occurs). The shape and tones in the signal are characteristics of low speed HF packet radio. Afterwards, Robert McGwier, a ham radio operator (call sign N4HY), wrote a software FSK demodulator and successfully decoded the packet! The decoder was computer intensive and large for that time. The work was done on a Cray-2 supercomputer. Robert McGwier found that the packet was from station WA8ZCN-0 sending a frame of type Receive Ready for number 3 to station N6AEZ on the 14 MHz radio band (i.e. an acknowledgment packet). The actual contact was confirmed latter by the involved stations.