Commodore 2040 User Manual page 58

56
Table 9. 4040 BAM FORMAT
Track 18, Sector O.
BYTE
CONTENTS
DEFINITION
0,1 18,01 Track and sector of first directory block.
2 65 ASCII character A indicating 4040 format.
3 0 Null flag for future DOS use.
4-143 Bit map of available blocks for tracks 1-35.
*1=available block
O=block not available
(each bit represents one block)
Table 10. 4040 DIRECTORY HEADER
Track 18, Sector O.
BYTE
CONTENTS
DEFINITION
144-161 Disk name padded with shifted spaces.
162-163 Disk ID.
164 160 Shifted space.
165,166
50,65
ASCII representation for 2A which is DOS version and
format type.
166-167 160 Shifted spaces.
171-255 0 Nulls, not used.
Note: ASCII characters may appear in locations 180 thru 191 on some diskettes.