External Disk Interface - SC12 @CHIP-RTOS V1.10
IPC@CHIP Documentation Index
Here is the interface definition for an external disk B: drive . This interface allows you to add an external B: drive. This drive must be block (sector) oriented. Each sector should be 512 bytes long. The application must provide a software interrupt 0xB1 function to read and write these sectors on this drive.
Maximum disk size is about 2 Gigabytes.
Interrupt 0xB0 service 0x01: Install External Disk
- This function will logically install a B: drive.
Prior to this call the application must provide a disk read/write function installed at interrupt 0xB1. This installed handler function should expect:
AX 1 for write, 0 for read.
BX,DX Sector number (BX is MSH of unsigned long)
CX Number of sectors to read/write
ES:DI Segment:Offset of memory area to read/write
The handler should return 0 in AX if OK.
Parameters
- AH
- 0x01
- BX,DX
- An unsigned long with the total number of sectors. BX holds high word.
Return Value
- AX is 0 if OK.
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Interrupt 0xB0 service 0x02: Deinstall External Disk
- Used to deinstall drive B: which was installed before with function
0x01 (above).
Parameters
- AH
- 0x02
Return Value
- AX =0 success
AX !=0 failed (may be drive was not installed?)
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