najmus saqib wrote:
HELLO
I want to ask something about DOS interrupts. Does freeDOS uses
MSDOS interrrupts. How can i do the same. can any1 tell me about the
Yes, it uses the same interrupts and parameter interface as MSDOS. More
specifically, it attempts to implement nearly 100% compatible (possibly
including advanced features, hence not 100% identical) interface
including most hooked interrupts and their functionality. On the flip
side, the FreeDOS kernel most likely calls the same set of interrupts as
MS DOS, ie BIOS calls; but the exact order and which ones called [ie
FreeDOS kernel may take advantage of newer functions such as LBA for
disk access] may not be the same.
files doing this in freeDOS kernel.
the primary interrupt handler (for int21h) is in inthndlr.c, see also
int2f.asm, intr.asm, and intwrap.asm for the C/Asm interface for the
interrupt handling. main.c will show you all interrupts hooked. Of
course the interrupt handlers call into the various other files; see
Pat's book on the FreeDOS kernel or have a look through the source and
the call tree should be pretty easy to follow.
Jeremy
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