Download Disk Reference Manual D9090 D9060 8250

DIRECTORY HEADER FCSRMATS
Directory Header
2031
Byte
1-143
144-161
162-163
164
165-166
167-170
171-255
Byte
1-143
144-161
162-163
164
165-166
167-170
171-255
Note:
Sector 00
Data
Definition
160
Reserved for 2031 BAM
Diskette name, padded with shifted spaces
Diskette ID Nr.
Shifted space
ASCII '2a' identifies DOS version & format
Shifted spaces
Not used
50, 65
160
00
Directory Header
4040
Track 18
Track 18
Sector 00
Data
Definition
160
Reserved for 4040 BAM
Diskette name, padded with shifted spaces
Diskette ID Nr.
Shifted space
ASCII '2a' identifies DOS version & format
Shifted spaces
Not used
50, 65
160
00
ASCII data may appear in bytes 180 - 191 on some diskettes.
Directory Header - Track 39
8050
Byte
Sector 00
Data
Definition
0-1
38-00
2
67
00
Track-Sector pointer to first BAM block
ASCII 'c' identifies DOS 2.5 format
Reserved for future DOS use
Not used
Diskette name, padded with shifted spaces
Shifted spaces
Diskette ID Nr.
Shifted space
ASCII '2c' identifies DOS version & format
Shifted spaces
Not used
3
4-5
6-21
22-23
24-25
160
26
160
27-28
29-32
33-255
50, 67
160
00
Directory Header - Track 39
8250
Sector 00
Byte
Data
Definition
0-1
38-00
67
00
Track-Sector pointer to first BAM block
ASCII 'c' identifies DOS 2.7 format
Reserved for future DOS use
Not used
Diskette name, padded with shifted spaces
Shifted spaces
Diskette ID Nr.
2
3
4-5
6-21
22-23
24-25
160
47