Jon Relay's Apple II Info Archives
ProDOS MLI Calls
In the parameter lists that follow, (Res) is used to denote a
value that the MLI call returns, (Val) is used to denote a value
passed to the MLI routine, and (Ptr) is used to denote a pointer
(address) of a string, buffer, or routine.
Path names are stored in memory as Pascal strings (that is, a count byte
followed by the actual path name). For the RENAME command,
both path names must be identical except for the last name.
A Unit Number is a byte of the form DSSSLLLL, where
D is the drive number (0 for drive 1 or 1 for drive 2),
SSS is the slot number, and LLLL is the length
of the name. For the ONLINE command, you can specify 0 as the
Unit Number to return the names of all the drives.
A Storage Type is a byte with the length of the file name in the
lower nybble and the storage type (0 for an inactive file, 1 for a
seedling, 2 for a sapling, 3 for a tree, $D for a directory)
in the upper nybble.
A date is stored in the format MMMDDDDD YYYYYYYM.
A time is stored with the minute in the first byte and the hour (in 24-hour format) in the second byte.
An Access Code is a byte of the format DRBXXXWR. In order,
the bits mean: file can be deleted, file can be renamed, file hasn't been
backed up, reserved, reserved, reserved, file can be written to, and file
can be read.
The Enable Mask is the AND mask used to compare the data in the file to the new line character. If it is 0, no character is used as the new line character.
Request Count is the number of bytes to be read or written to a file. Transfer Count is the number of bytes that were actually read or written.
File Types and Aux Types can be found here.
Interrupt Code must be a number between 1 and 4.
All Reserved parameters should be left set at 0.
After a GET TIME call, or any call for that matter, the hour is
stored in address $BF93 (49043 decimal) and the minute is stored in
address $BF92 (49042 decimal).
$40 ALLOC INTERRUPT - Parameters: 2 Interrupt Number (Res) - 1 Byte Interrupt Code (Ptr) - 2 Bytes $41 DEALLOC INTERRUPT - Parameters: 1 Interrupt Number (Val) - 1 Byte $65 QUIT - Parameters: 4 Reserved (Val) - 1 Byte Reserved (Ptr) - 2 Bytes Reserved (Val) - 1 Byte Reserved (Ptr) - 2 Bytes $80 READ BLOCK - Parameters: 3 Unit Number (Val) - 1 Byte Data Buffer (Ptr) - 2 Bytes Block Number (Val) - 2 Bytes $81 WRITE BLOCK - Parameters: 3 Unit Number (Val) - 1 Byte Data Buffer (Ptr) - 2 Bytes Block Number (Val) - 2 Bytes $82 GET TIME - Parameters: 0 $C0 CREATE - Parameters: 7 Path Name (Ptr) - 2 Bytes Access Code (Val) - 1 Byte File Type (Val) - 1 Byte Aux Type (Val) - 2 Bytes Storage Type (Val) - 1 Byte Creation Date (Val) - 2 Bytes Creation Time (Val) - 2 Bytes $C1 DESTROY - Parameters: 1 Path Name (Ptr) - 2 Bytes $C2 RENAME - Parameters: 2 Path Name (Ptr) - 2 Bytes New Path Name (Ptr) - 2 Bytes $C3 SET FILE INFO - Parameters: 7 Path Name (Ptr) - 2 Bytes Access Code (Val) - 1 Byte File Type (Val) - 1 Byte Aux Type (Val) - 2 Bytes Reserved (Val) - 3 Bytes Modification Date (Val) - 2 Bytes Modification Time (Val) - 2 Bytes $C4 GET FILE INFO - Parameters: 10 ($A) Path Name (Ptr) - 2 Bytes Access Code (Res) - 1 Byte File Type (Res) - 1 Byte Aux Type (Res) - 2 Bytes Storage Type (Res) - 1 Byte Blocks Used (Res) - 2 Bytes Modification Date (Res) - 2 Bytes Modification Time (Res) - 2 Bytes Creation Date (Res) - 2 Bytes Creation Time (Res) - 2 Bytes $C5 ONLINE - Parameters: 2 Unit Number (Val) - 1 Byte Data Buffer (Ptr) - 2 Bytes $C6 SET PREFIX - Parameters: 1 Path Name (Ptr) - 2 Bytes $C7 GET PREFIX - Parameters: 1 Data Buffer (Ptr) - 2 Bytes $C8 OPEN - Parameters: 3 Path Name (Ptr) - 2 Bytes I/O Buffer (Ptr) - 2 Bytes Reference Number (Res) - 1 Byte $C9 NEW LINE - Parameters: 3 Reference Number (Val) - 1 Byte Enable Mask (Val) - 1 Byte New Line Character (Val) - 1 Byte $CA READ - Parameters: 4 Reference Number (Val) - 1 Byte Data Buffer (Ptr) - 2 Bytes Request Count (Val) - 2 Bytes Transfer Count (Res) - 2 Bytes $CB WRITE - Parameters: 4 Reference Number (Val) - 1 Byte Data Buffer (Ptr) - 2 Bytes Request Count (Val) - 2 Bytes Transfer Count (Res) - 2 Bytes $CC CLOSE - Parameters: 1 Reference Number (Val) - 1 Byte $CD FLUSH - Parameters: 1 Reference Number (Val) - 1 Byte $CE SET MARK - Parameters: 2 Reference Number (Val) - 1 Byte Position in File (Val) - 3 Bytes $CF GET MARK - Parameters: 2 Reference Number (Val) - 1 Byte Position in File (Res) - 3 Bytes $D0 SET EOF - Parameters: 2 Reference Number (Val) - 1 Byte End of File (Val) - 3 Bytes $D1 GET EOF - Parameters: 2 Reference Number (Val) - 1 Byte End of File (Res) - 3 Bytes $D2 SET BUFFER - Parameters: 2 Reference Number (Val) - 1 Byte I/O Buffer (Ptr) - 2 Bytes $D3 GET BUFFER - Parameters: 2 Reference Number (Val) - 1 Byte I/O Buffer (Ptr) - 2 Bytes
