; COVER · spread BGS ground + BGF measure over desk power/mem/cpu
; LINEAR BGS->BGF->SDF · atoms EZZIE PHI THERMO on BGF · free rides · no duo
; edi=mode  0=ground BGS field one · else measure BGF (edi-esi)|1
; remain IN · SPV free rides BGF · never folds · not neural
        test    edi, edi
        jnz     .m
        mov     eax, edi
        or      eax, 1
        ret
.m:     mov     eax, edi
        sub     eax, esi
        or      eax, 1
        ret