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    // compute random seed from 0x600017 and FiftyMSecTick
    // NOTE: PedroM 0.80 alpha 3 or higher actually supports this, but still
    // claims to be AMS 1 and not to support any AMS 2 functions. And it also
    // has the same kernel version number as older 0.80 builds which don't
    // support it. (OK, they are alphas and I could just forget about them, but
    // still.)
    // So here's how we detect it. We first check if it is PedroM. Then we check
    // the kernel version number. It must be >=0x0080. And then we sort out the
    // old 0.80 alpha build by checking if there is still a ROM_CALL at 0x3cd
    // or the "1.48" string.
    unsigned long randnum=(unsigned char)-peekIO(0x600017);
    if (!AMS_1xx
        || (*(short*)0x32==('R'<<8)+'O' && *(unsigned short*)0x30>=0x80
            && 0x3cd[*(long**)0xc8]!=((long)'1'<<24)+((long)'.'<<16)
                                     +((long)'4'<<8)+(long)'8'))
      randnum+=(*((volatile unsigned long*)(_rom_call_addr(4FC))))*
               ((HW_VERSION>=2)?53:79);
    srand(randnum);