Radio Shack TRS-80 Model II Reference Manual page 214

Model II
TRSDOS
LOCATE
(function code 33)
This function returns the number ofthe current record, i. e., the number of
the last record accessed. You can use this call only with Fixed Length Record
files.
Entry Conditions
(DE)
=
Data Control Block for currently Open file (see OPEN)
HL=
A=
Reserved for use in later versions ofTRSDOS
33
Exit Conditions
BC
=
NZ=
A=
Current Record Number
Error
Error Code
READNX
Read Next Record (function code 34)
This routine reads the next record after the current record. (Current record is
the last record accessed.) If the file has just been Opened, READNX will read
the first record.
Entry Conditions
(DE)
=
Data Control Block for currently Open file (see OPEN)
HL = Reserved for use in later versions of TRSDOS
A= 34
250