Texas Instruments TI-99/4A in Riptide - Season 2, Episode 2, "The Orange Grove" (1984)

After sneaking into a military camp, the guys discover an officer dead in his quarters. Murray uses the officer's TI-99/4A (disguised as a PDQ-3) to access a military computer and gather vital clues.

The machine is shown as having a built in acoustic coupler and is connected to a TV by a pair of clips applied to its expansion port.