ADB to USB keyboard converter

This firmware converts Apple ADB keyboard/mouse protocol to USB and you can use old ADB keyboard/mouse on modern computer. It works on TMK ADB-USB converter or AVR microcontroller(ATMega32U4/2).

Discussion and info: https://geekhack.org/index.php?topic=14290.0

TMK ADB-USB converter: https://geekhack.org/index.php?topic=72052.0

Infos

Wiki: https://github.com/tmk/tmk_keyboard/wiki

ADB protocol: https://github.com/tmk/tmk_keyboard/wiki/Apple-Desktop-Bus

Issues: https://github.com/tmk/tmk_keyboard/issues?q=is%3Aissue+ADB

Firmware Code: https://github.com/tmk/tmk_keyboard/tree/master/converter/adb_usb

Wiring

Connect DATA, VCC and GND to microcontroller. Use port PD0 for DATA. PSW is not used.

You can change the port with ADB_PORT, ADB_PIN, ADB_DDR, ADB_DATA_BIT in config.h.

ADB female socket from the front:

  ,--_--.
 / o4 3o \      1: DATA
| o2   1o |     2: PSW(Power SW)
 -  ===  -      3: VCC
  `-___-'       4: GND

Pull-up resister:

The external 1k Ohm pull-up resistor on DATA is required.

AVR microcontroller's internal pull-up is too weak for ADB in particular when you want to use a long coiled cable or daisy-chain devices.

Keyboard       AVR MCU
               ,------.
5V------+------|VCC   |
        |      |      |
       [R]     |      |
        |      |      |
DATA----+------|PD0   |
               |      |
GND------------|GND   |
               `------'
R: 1k Ohm resistor

https://github.com/tmk/tmk_keyboard/wiki/Apple-Desktop-Bus#pull-up-resistor

Build firmware and Program microcontroller

To build firmware and program TMK ADB-USB Converter run these commands:

$ make -f Makefile clean
$ make -f Makefile [KEYMAP=yourname]
$ make -f Makefile [KEYMAP=yourname] dfu

You can select keymap name with optional KEYMAP= ('plain' is default name). Push button on the converter before running dfu target.

Use Makefile.rev1 for old TMK Converter rev.1 and Teensy2.0 instead of Makefile.

https://github.com/tmk/tmk_keyboard/wiki#build-firmware

Debug

Use hid_listen command line tool to see debug outputs.

https://github.com/tmk/tmk_keyboard/wiki#debug

Notes for keyboard

Apple Standard keyboard(M0116) can't discriminate between right and left modifiers while Apple Extended keyboard(M0115/M3501) can discriminate them except for Command key.

Notes for mouse

All one-button mouses should be supported and others will work as one-button mouse even if not supported.

Mouse protocols(handler ID) below are curretnly supported.

Apple Classic Mouse protocol (1, 2)
Apple Extended Mouse protocol (4)
Kensington Turbo Mouse 5 #64210 and Thinking Mouse (0x32)
Macally 2-button Mouse (0x42)
Logitech MouseMan/TrackMan Proprietary protocol (0x4C*)
Logitech MouseMan/TrackMan Extended protocol (0x4D*)
Micrspeed MacTrac (0x2F, 0x5F) - Not confirmed
Contour Design Countour Mouse (0x66) - Not confirmed
Mouse Systems A3 Mouse/Trackball (0x03) - Not confirmed
CH Products Tracball Pro/DT225 (0x42) - Not confirmed

https://github.com/tmk/tmk_keyboard/wiki/Apple-Desktop-Bus#mouse

Locking CapsLock

Many of old ADB keyboards have mechanical push-lock switch for Capslock and some like Apple Adujstable keyboard use firmware-base locking with momentary switch for Capslock.

The converter supports the locking Capslock key. Use keycode LCAP instead of CAPS in your keymap.

https://github.com/tmk/tmk_keyboard/wiki/FAQ-Keymap#mechanical-lock-switch-support

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