NTVDM: real DOS/16M executable complaining insufficient memory

running real DOS/16M executable (NAV CE 7.6 DOS scanner):
(subsystems/ntvdm/dos/dos32krnl/dos.c:2791) DOS Function INT 0x21, AH = 38h, AL = 0h NOT IMPLEMENTED!
(subsystems/ntvdm/dos/dos32krnl/dos.c:2791) DOS Function INT 0x21, AH = 34h, AL = 12h NOT IMPLEMENTED!
WARNING: Fast486FpuOpcodeDB at lib/fast486/fpu.c:127 is UNIMPLEMENTED!
WARNING: Fast486FpuOpcodeDD at lib/fast486/fpu.c:177 is UNIMPLEMENTED!
(subsystems/ntvdm/dos/dos32krnl/dos.c:2843) DOS Internal System Function INT 0x2F, AH = 16h, AL = 87h NOT IMPLEMENTED!
(subsystems/ntvdm/dos/dos32krnl/dos.c:2843) DOS Internal System Function INT 0x2F, AH = 43h, AL = 0h NOT IMPLEMENTED!
(subsystems/ntvdm/callback.c:274) Unhandled 32-bit interrupt: 0x67, AX = 0xDE00
(subsystems/ntvdm/callback.c:274) Unhandled 32-bit interrupt: 0x7F, AX = 0xBF08
(subsystems/ntvdm/callback.c:274) Unhandled 32-bit interrupt: 0x7F, AX = 0xBF02

it does show DOS/16M banner and insufficient memory error.