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Feature additions bug fixes blue box mode#3

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donfroula wants to merge 7 commits intoinaxeon:masterfrom
donfroula:Feature-additions-bug-fixes-blue-box-mode
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Feature additions bug fixes blue box mode#3
donfroula wants to merge 7 commits intoinaxeon:masterfrom
donfroula:Feature-additions-bug-fixes-blue-box-mode

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@donfroula
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Matt, I forked your latest code and applied my "bug fixes".

This branch off the fork adds hotline, adjustable DTMF digit length and a US "blue box" MF tone and 2600Hz mode.

See README for details.

I made some hardware changes in the schematic to add polarity guard to protect the regulator and a zener to assure sufficient 78L05 input voltage.

Feel free not to pull the changes!

Don

Fixed not returning to normal dialing mode after * or # dialing or redial function.
Added support for storing * and # in both redial and speed dial memories.
Added blue box and hotline modes and EEPROM feature setting storage, tone mode stored in memories
Added programmable digit length and hotline delay, EEPROM saved
Added MF digits, 2600Hz and other variables to support MF mode
…ending feature status tones

Added changes to support MF tones. 2600Hz tone and new ascending/descending feature status tones
Updated
Updated
Added recommended ATTINY85 fuse settings text file.
Added generic schematic with new polarity guard diodes and zener diode to insure sufficient input voltage to the regulator.
Added schematic showing connection points to a Western Electric 500 desk telephone set.
Adding operating instructions, including new features and blue box mode.
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