Spectrum polish off

Project Spectrum polish off
Status	In progress
Contact	mahjongg
Last Update	2014-04-18

Sinclair Spectrum polish off is a project to restore a donated defective Sinclair spectrum to working order, and to add some additional features:

Fixes done until now:

• Replaced blown up 7805 voltage regulator.
  
• Repaired the +12V & -5V generator (replaced two transistors).
  
• Completely replaced foil keyboard by 40 6x6mm buttons, hot glued to the inside and hard wired, the rubber keypad was modified to make place for the buttons.
  
• Built in a 1 transistor preamp to make the cassette input sensitive enough so it accepts signals from a tablet or laptop.
  
  

TODO:
Add a built in joystick port, that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.