System information

Table 6-9. EXM Values
EXM values
BLS DSM<256 DSM>255
1,024 0 N/A
2,048 1 0
4,096 3 1
8,192 7 3
16,384 15 7
The value of DSM is the maximum data block number supported by this particular drive,
measured in BLS units. The product (DSM + 1) is the total number of bytes held by the drive and
must be within the capacity of the physical disk, not counting the reserved operating system
tracks.
The DRM entry is the one less than the total number of directory entries that can take on a 16-bit
value. The values of AL0 and AL1, however, are determined by DRM. The values AL0 and AL1
can together be considered a string of 16-bits, as shown in Figure 6-5.
|------------- AL0 ---------|------------ AL1 ----------|
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
Figure 6-5. AL0 and AL1
6.10 Disk Parameter Tables CP/M Operating System Manual
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