From: joemonk64@gmail.com   
      
   > As far as I can tell, a BOOTX64.EFI containing maybe    
   > 3000 lines of code, mainly 64-bit C code, but maybe    
   > 1000 lines of 16-bit assembler and C, will do what I    
   > want, which is to restore a mini-BIOS on a UEFI-only    
   > machine. I only need a few interrupts - 13H, 10H    
   > and 14H.    
      
   BIOS and UEFI are pretty much mutually exclusive.  Take a read here:   
   https://wiki.osdev.org/UEFI#UEFI_vs._legacy_BIOS   
      
   For instance, you mention INT 14h - that has been replaced in UEFI with the   
   Serial Protocol ... an example serial protocol driver can be found here:   
   https://edk2-docs.gitbook.io/edk-ii-uefi-driver-writer-s-guide/a   
   pendix_a_edk_ii_file_templates/readme.3/   
   a36_serialioc_file   
      
   Joe   
      
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