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 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.