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Dff.c1981 BYTE sum /* Checksum of the corresponding SFN */ argument
1988 dir[LDIR_Chksum] = sum; /* Set checksum */
2075 BYTE sum = 0; local
2079 sum = (sum >> 1) + (sum << 7) + *dir++;
2081 return sum;
2098 WORD sum; local
2102 for (i = sum = 0; i < szblk; i++) {
2106 sum = ((sum & 1) ? 0x8000 : 0) + (sum >> 1) + dir[i];
2109 return sum;
2119 WORD sum = 0; local
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