Yeah, it looks playable. I'm a bit surprised, since:
IM-01: К1801ВМ1 CPU, K1809BB1 I/O chip
IM-05: К1801ВМ2 CPU, К1573ХМ1 I/O chip

I guess they are similar from black-box perspective.

The buttons:

Реж = режима, mode, PL=play, DP=?, BO=board setup.
СД looks like a cancel key, for example you can break out of chess calculations.
The circle with arrow-down looks like a confirm key, when setting level or when placing a piece in setup mode.
CТА = enter move
Arrow-right = go forward (after Take Back)
ПХ = hint
Р = Promotion (hold this key, press 1-6 when promoting a pawn)