This annotated photo shows the machine with some of the additional hardware labelled.

I soon began hacking on the hardware of the machine. My first change was to increase the 6502 clock to 2MHz, doubling the machine's speed — a very early example of overclocking. Perhaps I should have fitted a “turbo switch” so that I could run games at normal speed!

In all, I added these extra bells and whistles to my UK101:

• Numeric keypad
• AY-3-8910 sound generator
• Colour video board
• Rewritten monitor ROM
• 6522 parallel printer port
• SP0256 allophone speech chip
• Two 7-segment LED displays
• Analog I/O board
• RAM expansion to 32k bytes
• 9600 baud digital cassette
• 300 baud modem
  
• Software-selectable baud rate generator
• EPROM programmer
• Joystick port