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To elaborate a little further.... The code that currently does the following is executed as part of a replacement for the BIOS interrupt 19h bootstrap process. 1) Issue an ATAPI command to read sector 11h 2) Use the value at offset 47h to read the validation entry and initial section entry 3) Use the loadrba value from the initial section entry to read the first sector of

Hello, I am working on a legacy BIOS extension that is used to provide a centralised and managed boot process for a secure environment. Due to an assortment of reasons the access to hard disk / CD-ROM devices has had to be implemented at a low level (reading/writing IDE controller registers) rather than relying on the int 13h services provided by the system BIOS. Booting hard disks is working