Elektronika MS 1504

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

• Compatibility: IBM PC/XT
• 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 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
• Operation System: MS DOS 3.2/3.3
• BIOS: Russian
• Dimensions: 306x312x68 mm
• Gross weight: 6 kg (with batteries)
• Power supply: 5V Nickel-Cadmium battery or 220V/50Hz direct supply

• 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

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.

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