Spectrum polish off
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| Project Spectrum fixup | |
|---|---|
| Status | In progress |
| Contact | mahjongg |
| Last Update | 2014-04-16 |
Sinclair Spectrum fixup is a project to restore a donated defective Sinclair spectrum to working order:
Fixes done until now:
Replaced blown up 7805 voltage regulator.
Repaired +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.