Elektronika MS 1504 explained

Elektronika MS 1504 (ru|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]}

Technical specifications

• Compatibility: IBM PC/XT^[6]
• Central processor: Integrated KR1834VM86 (DL-24A, Intel i80C86 compatible) at a clock frequency of 4.77 MHz and 7.16 MHz in Turbo mode
• Processor bit depth: 16 bit
• Data bus width: 8 bits
• Memory: RAM - 640 KB, VT-34 RAM Controller consists of 20 KR565RU11D^[7] microcircuits; ROM - 32 KB
• Storage: 5.2", 3.5" FDD or 10MB HDD
• Video controller: CGA (640 × 200 pixels in 4 shades of gray, or 80 × 25 characters text resolution)
• Display: domestic IZhG93-640x200 LCD matrix^[8]
• Operation System: MS DOS 3.2/3.3^[9]
• BIOS: Russian
• Dimensions: 306x312x68 mm
• Gross weight: 6 kg (with batteries)
• Power supply: 5V Nickel-Cadmium battery or 220V/50Hz direct supply

Interfaces

• Parallel interface: IRPR-M/IEEE-1284 according to GOST 27942-88 (Centronics)
• Serial interface: C2 joint according to GOST 18145-81 (RS-232)
• Interface for connecting an external multi-color monitor according to GOST 28406-89 (RGB)
• Interface for connecting an external single-color monitor according to GOST 28406-89 (VIDEO/NTSC)
• Possibility of connecting an external 5.25" drive with a capacity of 360 KB
• Controller for two 3.5" or 5.2" disk drives with a capacity of 720 KB (3.5") and 360KB (5.2") each

Modifications

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.

Models

• PK-300
• PK-310 - PK-300 modification with a HDD.

Notes and References

1. Web site: Первый и последний Советский ноутбук - Электроника МС 1504. 6 November 2017.
2. Web site: I Finally Found It! Behold Elektronika MS 1504, the Only Soviet Laptop Ever.. . 14 October 2023 .
3. Web site: October 2022 . Soviet laptop "Elektronika PK-400" (Russian) . 2024-10-08 . electronika-5.ru.
4. Web site: Разработчики белорусского ноутбука: «Нас по праву можно назвать первопроходцами» . Belarus . Onliner.by . 6 November 2017 . Russian.
5. Web site: Ноутбук Электроника МС 1504 . 2024-10-08 . red-innovations.su.
6. Web site: МикроЭВМ персональная портативная "Электроника МС 1504" - Компьютеры Отечественные компьютеры Персональные компьютеры - Техника : Boatanchors in Russia . 2024-10-08 . www.boatanchor.ru.
7. Web site: МикроЭВМ персональная портативная "Электроника МС 1504" - Компьютеры Отечественные компьютеры Персональные компьютеры - Техника : Boatanchors in Russia . 2024-10-08 . www.boatanchor.ru.
8. В. . Осика . М. . Бобровницкий . М. . Гурин . А. . Евтушенко . А. . Заводченков . В. . Кособрюхов . Г. . Орлевич . С. . Иванцова . А. . Спицын . Модуль жидкокристаллического экрана с информативностью 640Х200 точек для портативного компьютера ПК 300 . Liquid crystal display module with information content of 640X200 pixels for portable computer PK-300 . Электронная промышленность . Russian . 1990 . 3 . page=123–125 . 0207-6357.
9. Web site: Soviet Digital Electronics Museum -- Elektronika MC 1504 (PK300) -- МС 1504 (ПК300) -- Коллекция советской цифровой электроники . 2024-10-08 . www.leningrad.su.