Win95 DOS Call: Difference between revisions

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Line 1: {{Stub}}▼ Windows '95, while not precisely a disk image utility itself, gives a programmer an easy access method for reading and writing data from/into disk image files. This comes from the total lack of security features in Win95. The method is the DOS interrupt call: INT21h, ax=0x7305. This might make Win95 a better choice for an OS development platform than Win98.▼ ▲Windows '95, while not precisely a disk image utility itself, gives a programmer an easy access method for reading and writing data from/into disk image files. This comes from the total lack of security features in ~~Win95~~the OS. The method is the DOS interrupt call: INT21h, ax=0x7305. This might make ~~Win95~~Windows 95 a better choice for an OS development platform than ~~Win98~~Windows 98. ==Usage== The main reason to be working with disk images when doing OS development is that they are needed for [[emulators]] such as [[Bochs]]. If you are using a non-standard ~~FileSystem~~[[filesystem]] in the emulator, then you must use a disk ~~HexEditor~~[[hexeditor]], or read and write sectors in your disk image file directly, because no host OS will recognize your non-standard filesystem. This interrupt call gives a programmer a method to read and write logical disk sectors. You need to use some utility to find the sector location on your disk partition of your disk image. Line 9 ⟶ 11: Set si to 0x6001 for a write, or 0 for a read. cx = 0xffff, ds:bx points to the DISKIO structure, dl = logical drive letter (1= A, 2= B, ... ), ax = 0x7305. Then do an INT 0x21. ▲{{Stub}} [[Category:Disk Image Utilities]] [[Category:Windows]]