I had a Tandy 1000 TL/2; it had a tandy specific MS-DOS 3.3 with Deskmate setup in ROM, booted pretty darn fast; but you had to give that up if you wanted to boot a newer dos. A newer MS-DOS still booted quick, and there wasn't much to the BIOS before it hit the drives, but you couldn't run Deskmate on standard MS-DOS.