Deutschland 83 - Season 1, Episode 3, "Atlantic Lion" (2016)
Overcoming a Comecon embargo, the East Germans get hold of an IBM Portable PC 5155 (which they call an IBM 567) to try to access a disc containing a NATO report on a possible nuclear strike, but find its contents are encrypted.
The PC 5155 was released in 1984, this is set in 1983.