search for: 4b01h

On 3/21/2016 08:08, Andy Pont via Syslinux wrote: > In order to get this to work am I going to need to hook int 13h so that I > can provide the correct responses to functions such as 4B01h and 42h or is > there a simpler way of achieving what I need? To the best of my knowledge, disk-based Syslinux expects INTerrupt 0x13 to be available. I don't understand why your strategy would not be to implement it. (Or hook it.) An operating system such as Windows (on BIOS) can'...

...---------------------------------------------- ; Get first emulated drive number ; returns: ; CF=1 - not in emulation mode ; CF=0 - in emulation mode ; DL - drive number for emulation get_emul_drive: push ax push si ; mov [spec_packet], 13h mov dl, 0ffh ; drive number get_emul_drive1: mov ax, 4b01h ; get status mov [spec_packet], 0 call int13 ; Bogus Dell PC's do not return carry flag correctly - ignoring it ; jnc get_emul_drive_ok ; some bogus bioses (Dell Inspiron 2500) returns packet size 0xff when failed ; Dell Dimension XPsT returns packet size 0x14 when OK cmp [spec_packet], 1...

...y broken BIOS detected, last attempt with drive = 81 isolinux: Main image LBA = 00000028 isolinux: Disk error 01, AX=4228, drive 81 Boot failed: press a key to retry... In order to get this to work am I going to need to hook int 13h so that I can provide the correct responses to functions such as 4B01h and 42h or is there a simpler way of achieving what I need? Thanks, Andy.