User`s guide

Table 3-4. (continued)
Offset Description
3C-3D Current DMA Address
3E Current Disk
3F - 43 Reserved For System Use
44 Current User Number
45 - 49 Reserved For System Use
4A BDOS Multi-Sector Count
4B BDOS Error Mode
4C - 4F Drive Search Chain (DISKS A:,E:,F:)
50 Temporary File Drive
51 Error Disk
52 - 56 Reserved For System Use
57 BDOS flags
58 - 5C Date Stamp
5D - 5E Common Memory Base Address
5F - 63 Reserved For System Use
If Function 49 is called with the OFFSET parameter of the SCB parameter block
greater than 63H, the function performs no action but returns with registers A and
HL set to zero.
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BDOS Function Calls CP/M 3 Programmers Guide