Does anybody have more information about the tape header for the
M100/200? Specifically the file descriptor (the first block of data).
leader (long string): 0x55
magic key (1 byte): 0x7F
block type (1 byte):
0xD0 = file descriptor for ML program (*.CO)
0xD3 = file descriptor for tokenized BASIC program (*.BA)
0x8D = data file
0x9C = file descriptor for data file (*.DO)
filename (6 bytes)
file start address (2 bytes - high byte, then low byte) for .CO file
file size (2 bytes - high byte, then low byte)
file run address (2 bytes - high byte, then low byte) for .CO file
4 bytes of unknown data
checksum (1 byte) - add bytes from block type to checksum together, must
= 0x00
I'm trying to figure out what the 4 bytes of unknown (just before the
checksum) do, they seem to be 0x00, 0xFE, 0x02, 0x6E for everything I have.
************ LEADER 0x5555
************ MAGIC 0x557F
************ 0xD3
~~>>BLOCK TYPE = FILENAME (TOKENIZED BASIC)
************ 0x4C 'L'
************ 0x49 'I'
************ 0x46 'F'
************ 0x45 'E'
************ 0x32 '2'
************ 0x20 ' '
~~~~FILE NAME (6 BYTES)
************ 0x05
************ 0xF3
~~~~FILE START (2 BYTES) = 62213
************ 0xB7
************ 0x09
~~~~FILE SIZE (2 BYTES) = 2487
************ 0x05
************ 0xF3
~~~~FILE EXEC (2 BYTES) = 62213
************ 0x00
************ 0xFE
************ 0x02
************ 0x6E 'n'
************ 0x70 'p'
~~~~CHECKSUM GOOD - BLOCK COMPLETE
Darren Clark
