INT 13h Question
Posted: Sat Dec 18, 2010 6:48 pm
Hello, I would like to know how many continuous sectors can int 13h read and why is it limited?
Thanks in advance.
Thanks in advance.
If you use ah=42h you can in principle read up to 127 sectors. However, the input buffer cannot straddle a 64kb boundary in RAM because of the daft way IBM implemented DMA in the originaal PC - at least that limitation applies to floppies. Hard disks nowadays implement their own DMA.renovatio wrote:Hello, I would like to know how many continuous sectors can int 13h read and why is it limited?
Thanks in advance.