The 1986 PhD Thesis from Loughborough University, that provides the specification for a K3000, also refers to the use of a K2000E.

From the reference, something of the K2000E specification can be inferred:

Processor:  Z80 (as Z80 Assembler is used).

RAM: Unknown.

Storage: Unspecified size Floppy Disk Drive.

Interfaces: P.P.I. Interface. Expansion slots for I/O cards. (RTC and 16-channel, 12-bit ADC fitted).

OS: Unknown but CP/M assumed. (MBASIC used).

There is also mention of a Kemitron ADA-5 Card – a bidirectional 12-bit DAC and ADC, which is likely the ADC in use.