Elektronika MS 1504 (Russian: Электроника МС 1504), initially called PK-300, was the first laptop computer to be manufactured in the Soviet Union, BSSR, then in Belarus, after the collapse of USSR.

[1][2][3] Developed in 1986-1990 by Nemiga Design Bureau, it was produced by the "Integral" Scientific Production Association in 1991-1993, its prototype was Toshiba T1100 Plus.

[4][5] There were three computer modifications: with a domestic display module based on the IZhG93-640x200 LCD matrix manufactured by the Saratov Electronic Plant "Reflector", as well as with compatible display modules from Toshiba and Citizen.

Each of these modifications had two versions: with a display without backlighting (green screen - black characters) and with backlighting (blue screen - white characters), both with adjustable contrast.

Externally, the backlit version was distinguished by a thicker cover and a smaller screen diagonal.