Spectrum polish off: Difference between revisions
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m (Mahjongg moved page Spectrum fixup to Spectrum polish off: fixup has a different meaning for most) |
Revision as of 11:51, 18 April 2014
| 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.