tds_types.txt

    SYBCHAR = 47,       /* 0x2F */
    SYBVARCHAR = 39,    /* 0x27 */
    SYBINTN = 38,       /* 0x26 */
    SYBINT1 = 48,       /* 0x30 */
    SYBINT2 = 52,       /* 0x34 */
    SYBINT4 = 56,       /* 0x38 */
    SYBINT8 = 127,      /* 0x7F */
    SYBFLT8 = 62,       /* 0x3E */
    SYBDATETIME = 61,   /* 0x3D */
    SYBBIT = 50,        /* 0x32 */
    SYBTEXT = 35,       /* 0x23 */
    SYBNTEXT = 99,      /* 0x63 */
    SYBIMAGE = 34,      /* 0x22 */
    SYBMONEY4 = 122,    /* 0x7A */
    SYBMONEY = 60,      /* 0x3C */
    SYBDATETIME4 = 58,  /* 0x3A */
    SYBREAL = 59,       /* 0x3B */
    SYBBINARY = 45,     /* 0x2D */
    SYBVOID = 31,       /* 0x1F */
    SYBVARBINARY = 37,  /* 0x25 */
    SYBNVARCHAR = 103,  /* 0x67 */
    SYBBITN = 104,      /* 0x68 */
    SYBNUMERIC = 108,   /* 0x6C */
    SYBDECIMAL = 106,   /* 0x6A */
    SYBFLTN = 109,      /* 0x6D */
    SYBMONEYN = 110,    /* 0x6E */
    SYBDATETIMN = 111,  /* 0x6F */
    XSYBCHAR = 175,     /* 0xAF */
    XSYBVARCHAR = 167,  /* 0xA7 */
    XSYBNVARCHAR = 231, /* 0xE7 */
    XSYBNCHAR = 239,    /* 0xEF */
    XSYBVARBINARY = 165,    /* 0xA5 */
    XSYBBINARY = 173,   /* 0xAD */
    SYBLONGBINARY = 225,    /* 0xE1 */
    SYBSINT1 = 64,      /* 0x40 */
    SYBUINT2 = 65,      /* 0x41 */
    SYBUINT4 = 66,      /* 0x42 */
    SYBUINT8 = 67,      /* 0x43 */
    SYBUNIQUE = 36,     /* 0x24 */
    SYBVARIANT = 98     /* 0x62 */


http://technet.microsoft.com/en-us/library/ms187752.aspx