Apple-2-HW/unified_retro_keyboard
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unified_retro_keyboard/hardware/interface-osi/special_keys.sch
Dave 5fa0f80b4e Add OSI interface schematic 
Provides a keyboard interface to interface with OSI computers.  Equivalent to an
OSI 542C.

- Includes sound circuits

- Includes RESET delay circuit

- SHIFT LOCK can be mechanical push-on/push-off or soft toggle, selectable by
jumper.

- Provide SHIFT LOCK LED output.
2020-04-21 14:30:59 -05:00

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EESchema Schematic File Version 4
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EELAYER END
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ShiftLock_1
Text HLabel 1750 5350 0 50 UnSpc ~ 0
ShiftLock_2
Text HLabel 8950 6150 2 50 Output ~ 0
ShiftLock_LED+
Text HLabel 8950 6250 2 50 Output ~ 0
ShiftLock_LED-
Text HLabel 1750 1400 0 50 UnSpc ~ 0
Break_1
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Break_2
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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~RESET~ pulse is approx 50 usec.
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