From: noemail@basdxcqvbe.com   
      
   On Sun, 12 Dec 2021 14:32:15 -0700   
   Grant Taylor  wrote:   
      
   > On 12/12/21 1:58 PM, muta...@gmail.com wrote:   
      
   > > They did allow hard disks to be redirected to the USB port.   
   >   
   > No.   
   >   
   > USB has something that looks like a hard disk.  But it's decidedly   
   > different than a hard disk attached to an IDE / SCSI controller.   
      
   Are you talking about a USB storage device, such as a USB stick or a   
   USB hard disk?   
      
   Or, are you talking about legacy BIOS drive emulation which is a   
   combination of BIOS support, a USB storage device, and a bootable image   
   stored on the USB device?  i.e., the USB-FDD, USB-HD, USB-ZIP etc boot   
   options on the BBS Boot Menu   
      
   I think Paul is referring to the latter when he said, "they [allowed]   
   hard disks to be redirected to the USB port."   
      
      
   FYI, the BIOS Boot Specification is what requires the bootable device   
   type to be reported as either usb, floppy, hard disk, cd-rom, pcmcia,   
   or network.  This standard defines how execution is transferred from   
   the BIOS (non-UEFI) to the boot code, either a procedure for IPL   
   devices, or installable Int 13h drive support routines for BCV devices.   
   BCV devices have an option ROM which has extra Int 13h routines, e.g.,   
   SCSI.  This spec also specifies the BIOS Boot Menu pop-up etc as well as   
   various changes to Int 18h, Int 19h, where Int 13h gets copied to Int   
   40h, the BDA updated with installed drives, and so forth.   
      
      
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