2Dh FL$FREC find a record number
Input D = record number to be found
Output A = length of record found
B = record type found
X = pack address of the record found (low bytes)
UTW_S0 = pack address of the record found (high byte)

Returns information about the D'th record of the current record type on the current datapack.

If the record exists, the three byte pack address of the start of the record is returned - the first byte of UTW_S0 being the most significant byte of the address, and X being the least significant word of the address.

If there are less than D records on the datapack, error "END OF FILE" is returned.

Example To find the tenth record of type $90
        LDAB    #$90
        OS      FL$RECT
        BCS     ERROR

        LDD     #10
        OS      FL$FREC
        BCC     FOUND

        CMPB    #238       ;end of file
        BNE     ERROR

        STAA    LENGTH
        LDAA    UTW_S0
        STX     PACK_ADDRESS+1
Errors 194 - battery too low
200 - read pack err
238 - end of file (no match occurred)
240 - unknown pack
241 - pack not blank
243 - bad device name
245 - write pack err
246 - no pack