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M0110/M0110A to USB keyboard converter
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This firmware converts the protocol of Apple Macintosh keyboard **M0110** , **M0110A** and **M0120** into USB. Target of this project is USB AVR controller **ATmega32U4** . Using this converter you can revive these retro keyboards with modern computer.
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Read README of top directory too.
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Pictures of **M0110 + M0120** and **M0110A** .
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- M0110A support was contributed by [skagon@github ](https://github.com/skagon ).
- M0120 also is supported. keys(+ * / and ,) on M0120 are recognized as cursor keys.
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Update
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- 2013/08: Change port for signals `PF` to `PD`
- 2013/09: Change port again, it uses inversely `PD0` for data and `PD1` for clock line now.
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- 2014/06: Change keymaps
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Building Hardware
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You need **4P4C** cable and **ATMega32U4** board like PJRC [Teensy]. Port of the MCU `PD1` is assigned to `CLOCK` line and `PD0` to `DATA` by default, you can change pin configuration with editing `config.h` .
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[](http://i.imgur.com/4G2ZOeg.jpg)
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### 4P4C phone handset cable
Note that original cable used with Mac is **straight** while phone handset cable is **crossover** .
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< http: / / en . wikipedia . org / wiki / Modular_connector # 4P4C >
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Close-up picture of handset cable. You can see one end of plug has reverse color codes against the other. Click to enlarge.
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[](http://i.imgur.com/3S9P1mY.jpg?1)
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[Teensy]: http://www.pjrc.com/teensy/
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### Socket Pinout
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- < http: // pinouts . ru / Inputs / MacKeyboard_pinout . shtml >
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### Pull-up Resistor
You may need pull-up resistors on signal lines(`CLOCK`, `DATA` ) in particular when you have long or coiled cable. **1k-10k Ohm** will be OK for this purpose. In that case the converter may not read signal from keyboard correctly without pull-up resistors.
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Building Firmware
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-----------------
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To compile firmware you need AVR GCC. You can edit *Makefile* and *config.h* to change compile options and pin configuration.
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$ git clone git://github.com/tmk/tmk_keyboard.git (or download source)
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$ cd m0110_usb
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$ make clean
$ make
To select keymap use `KEYMAP` option.
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$ make clean
$ make KEYMAP={plain|spacefn|hasu}
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Keymap
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To create your own keymap copy existent keymap file to `keymap_name.c` and edit it. You can build it like this.
$ make clean
$ make KEYMAP=name
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Debug
-----
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You can use [PJRC HID listen ](http://www.pjrc.com/teensy/hid_listen.html ) to see debug output. The converter has some functions for debug, press `<Command>+H` simultaneously to get help.
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- Command: `Shift+Option+Command` (`Shift+Alt+Gui` or `Shift+Alt+Control` )
