Leningrad 1

Also called Ленинград-1, Leningrad 48k.Designed by Sergey Zonov .It was manufactured from 1988. The computer was inspired by or was successor to ZX Spectrum. Hardware is based on Z80 @ 3.5.

Parts of this topic may be machine translated.

Clone ZX Spectra 48k without using ULA, total 41 circuits including memories (DRAM 64kx1bit 8x, ROM 2x, Z80, 74xx00, 74xx02, 74xx04 2x, 74xx08, 74xx10, 74xx32, 74xx74 3x, 74xx86, 74xx174, 74xx193 4x, 74xx295, 74xx373, 74xx165, 74xx298 2x, 74xx257 8x, 4520 ) on a double-layer printed circuit board with dimensions of 203x118 mm.

Leningrad 1 128k mod

Leningrad Mod 1,256k

Video Output Modification

Leningrad has a non-standard video output that, for example, lacks a black level reference and has a very long horizontal sync pulse. Soviet TVs were very tolerant and could display everything that was fed into the video input.

There are several improvements to the Leningrad-1 video output that can help to achieve a high-quality picture when connecting the computer to modern TVs, monitors or TV tuners.

Computers derived from Leningrad 1

The following computers were inspired by or derived from Leningrad 1:

• Leningrad 2

References

• https://zxbyte.ru/leningrad.htm (WebArchive)
• https://sblive.narod.ru/ZX-Spectrum/Leningrad48k/Leningrad48k.htm (WebArchive)