Spectrum polish off

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Revision as of 23:05, 19 April 2014 by Mahjongg (talk | contribs)
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Project Spectrum polish off
Status In progress
Contact mahjongg
Last Update 2014-04-19


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.
  • replaced a rubber feet
  • added a composite video output cable

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.