Modifications

Components:

 * LCD - Ebay example 1
 * LCD - Ebay example 2
 * 2 x 4.7Kohms pull up resistors (+5V)
 * Push button

OLED mod
You can also add a OLED screen instead of LED. These screens can be obtained from eBay by searching "I2C Serial SPI OLED LCD Display 128x32" and the size you would be looking for is 128x32.

Sound mod
It has recently been confirmed, that it is possible to install a sound-buzzer to obtain the floppy drive buzz sound instead of total silent. This will require connections to two pins as illustrated on the picture.

You can find the buzzers by searching “Piezo Buzzer” on eBay and the price is about 0,20 – 0,30 € pr. Pcs.

Rotary Encoder
The idea is that you can control the display number with a Rotary Encoder instead of knobs up/down. Jean recently added support for this in the latest firmware.
 * Source: Link