K1801VM1 has the following support microchips:
K1801VP1-030 - dynamic memory controller
K1801VP1-033 - floppy drive controller and parallel interface
K1801VP1-034 - system bus controller
K1801VP1-035 - serial interface

All of them had been manufactured in original 42-pin flat dual inline packages. 
ROM chips for K1801 processors were, on the contrary, manufactured in standard 24-pin packages, 
for example K1801RE1-000 (8KB