This is my 800xl with BASIC/ASSEMBLER, 256kb memory upgrade and HD-power!      

From the outside, you see nothing special, except the little green led (top right) and the extra switches at the back. Inside you find the modifications ;-)

OS-selector, HD-reset, HD-power                                     BASIC/ASSEMBLER

For the HD-upgrade I used my own MyIDE-kit with the optional MyIDE-OS in ROM.
Beside that, a IBM traveldisk 4.8 Gb, 2.5" to 3.5" IDE-converter and a IDE-cable