Tandy 600 Programmer's Reference Manual page 113

Function
1Dh
-
Get Record
Size
Parameter
Block;
00:
FILEJHANDLE
01:
RECORD
Return Value:
AX:
STATUS
File Identifier
Record
number
This function
wfll
return
the
total
number
of
bytes
occupied by
the specified record
in
the
specified
file.
The
value
is
returned
in
AX.
Error
Returns:
108