R6 Contains the Hexadecimal Record type Contains the symbolic record type
R0 Contains the Ordinal Number
R7 Address of an 8-byte field where the system file reference is to be placed. Normally, the location of FARW because the address must be there before the find or file function can be called.
Return from FACE/FACS:
System file reference at the 2nd full word from the specified location
R0: maximum ordinal number for record type
R1-5: contents unchanged
R6-7: contents changed