You will admit that it's a bit odd, though, to label the interrupt as ''diskette services'' when in fact it can service any drive. This almost has to be a modification implemented after Win 95; little if any need for the diskette services to double-up for hard drives in the days of MS-DOS.
Oh yeah, BIOS is very odd. In 2001 I spent some "quality time" with the Phoenix BIOS source code, modifying it for our custom Pentium-III Compact PCI processor card. Let's just say I've had better times at work! I ended up printing out a lot of that site that I referred you to.
P.S. I posted the link as an informational link for you, not as an intented correction.