Commodore 2040 User Manual page 57

Table 7. 2040, 3040 BAM FORMAT
Track 18, Sector O.
BYTE CONTENTS DEFINITION
0,1 18,01
Track and sector of first directory block.
2 1 Indicates version 1 format.
3 0 Null flag for future DOS use.
4-143 *Bit map of available blocks for tracks 1-35.
*l=available block
O=block not available
(each bit represents one block)
Table 8. 2040, 3040 DIRECTORY HEADER
Track 18, Sector O.
BYTE CONTENTS DEFINITION
144"-161
Disk name padded with shifted spaces.
162-163 Disk ID.
164-170 160 Shifted spaces.
171-255 0 Nulls, not used.
Note: ASCII characters may appear in locations 180 thru 191 on some diskettes.
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