Great item for chip collectors !!!

KM1811VT1 - is the memory extender to access 4096KB (22bit support).
Made in USSR - on the NPP Elektronika (Voronezh city) in the 1987.
 
The IC is a memory manager that provides docking of KN1811VM1 (CPU) with up to 4 MB of RAM.
Converts 16-bit logical addresses to 18- or 22-bit physical addresses,
which provides expanding the amount of addressable memory from 64 to 256 KB or up to 4 MB,
memory protection functions and provides separation of the address space used in the system user mode,
various types of access to each page you move (no access page, read-only page, write and read page).
For the system and user modes, the addresses are moved page by page with a page length
from 64 bytes to 8 kbytes with a step of 64 bytes.

1811VM1 is the main 11/23 processor.

1811VU1 is the Microm containing the 92 standard instructions.

1811VU2, VU3. Provide floating-point instructions, 46 extended instructions.
This 46-pin module is from the Elektronika-60, Elektronika-85 Computers

IC in excellent condition.
  
Look an actual pictures above - You receive exactly what You see!!