System information

Table 6-7. (continued)
Disk Parameter
Header Meaning
DPB Address of a disk parameter block for this drive. Drives withidentical disk
characteristics address the same disk parameter block.
CSV Address of a scratch pad area used for software check for changed disks.
This address is different for each DPH.
ALV Address of a scratch pad area used by the BDOS to keep disk storage
allocation information. This address is different for each DPH.
Given n disk drives, the DPHs are arranged in a table whose first row of 16 bytes corresponds to
drive 0, with the last row corresponding to drive n-1. In the following figure the label DPBASE
defines the base address of the DPH table.
DPBASE:
00 XLT00 0000 0000 0000 DIRBUF DBP00 CSV00 ALV00
01 XLT01 0000 0000 0000 DIRBUF DBP01 CSV01 ALV01
(AND SO ON THROUGH)
n-1 XLTn-1 0000 0000 0000 DIRBUF DBPn-1 CSVn-1 ALVn-1
Figure 6-3. Disk Parameter Header Table
6.10 Disk Parameter Tables CP/M Operating System Manual
6-29