IPC@CHIP Documentation - SC12 @CHIP-RTOS V1.10

IPC@CHIP Documentation Index
External Disk Drive
External Disk Interface - SC12 @CHIP-RTOS V1.10
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_function_0x01:_Install External Disk
● Interrupt_0xB0_function_0x02:_Deinstall External Disk
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:
Parameters
AH
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.
0x01
BX,DX
An unsigned long with the total number of sectors. BX holds high word.
Return Value
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AX is 0 if OK.
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