In the 1970's only the big major organizations and government departments used computers (as they were hugely expensive). They were also the big bulking analogue driven types that took up half the office space and made so much noise that it drown out everything around it.
By the second half of the 1980's, desktop computers were being installed across many companies....
You've omitted the transitional mini-computer era of the 70s and 80s. The minis (such as my beloved PDP-11) were considerably smaller, quieter, less finicky, and far less expensive than the behemoths you mention, being about the size of a refrigerator (a 70s fridge, that is, smaller than today's). They were used for many purposes, from bookkeeping to controlling large telescopes (even though they generally had a main memory of only 16K bytes or so).
Murray and Gordy could have used a mini to write, store, and print out on-air reports. However a mini was not well suited to writing letters because letter-quality printers had not yet been developed, so its use in the WJM newsroom would have been too limited to justify purchasing one.
As desktop computers were developed and improved in the 80s, they gradually took over (and greatly expanded) the mini's niche.
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