; FAN PWM · 0..255 linear · edi in → eax out |1
; LINEAR BGS->BGF->SDF · atoms EZZIE PHI THERMO on BGF · free rides · no duo
        mov     eax, edi
        test    eax, eax
        jns     .p
        xor     eax, eax
.p:     cmp     eax, 255
        jbe     .ok
        mov     eax, 255
.ok:    or      eax, 1
        ret