I'm using Sergey's floppy bios with an HD floppy controller, modified to disable the on-board Tandy floppy controller.

If I use this bios with no boot floppy in the drive, I'll ultimately get an error about no system disk/boot failure.

I'd LIKE to modify the Sergey bios to default to the built-in Tandy ROM boot if possible.

Does anyone know to trigger that ROM boot code in assembly?