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# Poor man's "Keyrah" to connect C64 keyboard to USB (for BMC64 emulator)
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## Building
- Solder all keyboard connector pins to Arduino Pro Micro.
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- You can solder Restore key (connector pin "I") paraller to some other pin. I soldered "I" and "G" to Arduino pin A8. (this is actually not needed, because there is one free pin left). [Pins I used ](https://github.com/mcgurk/Arduino-USB-HID-RetroJoystickAdapter/blob/master/C64_keyboard/README.md#pins-i-used ).
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- You can also connect LED of C64 to VCC/GND of Arduino. I used 220ohm resistor.
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## Firmware/flashing
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- Download Soarer controller firmware (Soarer_Controller_v1.20_beta4.zip): https://geekhack.org/index.php?topic=50437.0 (or https://deskthority.net/workshop-f7/soarer-s-keyboard-controller-firmware-t6767.html)
- Extract /firmware/Soarer_Controller_v1.20_beta4_atmega32u4.hex from Soarer_Controller_v1.20_beta4.zip
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- Install Arduino IDE
- Connect RST to GND couple of times to get Arduino Pro Micro to programming mode (notice that com-port is different in programming mode in Windows)
- Flash firmware
```
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# old: & "C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude" -C"C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf" -v -p m32u4 -c avr109 -P COM5 -b 57600 -U flash:w:firmware\Soarer_Controller_v1.20_beta4_atmega32u4.hex:i
# 11.2.2023:
& "$ENV:LOCALAPPDATA\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17\bin\avrdude.exe" -C"$ENV:LOCALAPPDATA\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17\etc\avrdude.conf" -v -p m32u4 -c avr109 -P COM9 -b 57600 -U flash:w:firmware\Soarer_Controller_v1.20_beta4_atmega32u4.hex:i
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```
## Setup
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- Download [config file ](https://github.com/mcgurk/Arduino-USB-HID-RetroJoystickAdapter/raw/master/C64_keyboard/C64_matrix.sc ). Check pin order to match your setup.
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- Compile and upload config file to Arduino Pro Micro
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```
.\scas C64_matrix.sc C64_matrix.bin
.\scwr C64_matrix.bin
```
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## Testing
- https://keycode.info/
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## Pins I used
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```
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// Pin Label
// 20(A) 2(D2/PD1)
// 19(B) 3(D3/PD0)
// 18(C) 4(D4/PD4)
// 17(D) 5(D5/PC6)
// 16(E) 6(D6/PD7)
// 15(F) 7(D7/PE6)
// 14(G) 8(D8/PB4)
// 13(H) 9(D9/PB5)
// 12(0) 10(D10/PB6)
// 11(1) 16(D16/PB2)
// 10(2) 14(D14/PB3)
// 9(3) 15(D15/PB1)
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// 8(4) A0(A0/PF7)
// 7(5) A1(A1/PF6)
// 6(6) A2(A2/PF5)
// 5(7) A3(A3/PF4)
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// 4 N/C
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// 3(8) TX(D1/PD3)
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// 2 N/C
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// 1(I) 8(D8/PB4)
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```
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## Links
- https://geekhack.org/index.php?topic=50437.0
- https://deskthority.net/workshop-f7/soarer-s-keyboard-controller-firmware-t6767.html
- Newest I found was Soarer_Controller_v1.20_beta4.zip from 26.10.2013
- Soarer config file documentation: https://deskthority.net/download/file.php?id=8833 (Soarer_Converter_v1.12_docs.zip)
- Keynames used in config file from https://deskthority.net/download/file.php?id=8833 (Soarer_Converter_v1.12_docs.zip): /docs/codes.html
- https://www.waitingforfriday.com/wp-content/uploads/2017/01/C64_Keyboard_Schematics_PNG.png
- http://kookye.com/wp-content/uploads/2016/02/Pinout-ProMicro.jpg
- I used this as starting point: https://github.com/abzman/Keyboard-config-file/blob/master/C64_matrix.sc
- C64-emulator for Raspberry Pi 2/3: http://accentual.com/bmc64/
- For bigger matrices use Arduino Micro (24 usable IO pins) https://www.40percent.club/2017/10/green-arduino-micro.html (The largest matrix you can do with a Pro Micro with its 18 pins is 9x9, 81 keys.)
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- Example macros: https://sharktastica.co.uk/guides/soarers_2
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## Macro without modifier key
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Even though modifier key is mandatory, it can be replaced with unpressed modifiers. This writes shifted A when only a-key is pressed:
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```
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macroblock
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macro A -ALL
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SET_META LSHIFT
PRESS A
CLEAR_ALL
endmacro
endblock
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```
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## Issues (all issues are fixed in newer BMC64 versions)
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### Issue with Menu key (fixed in newer BMC64 versions)
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- .crt-files doesn't work with C= + F7, so as workaround LSHIFT + F7 is F12.
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### Issue with shift (fixed in newer BMC64 versions)
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- "+", "-", "£", "@" and "*" doesn't produce GFX-chars when shifted
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#### "Repair" rpi_sym.vkm (1.0.9)?
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- at 5 6 0 -> 5 6 8
- minus 5 3 0 -> 5 3 8
- plus 5 0 0 -> 5 0 8
- sterling 6 0 0 -> 6 0 8
- asterisk 6 1 0 -> 6 1 8
```
sed -i 's/5 6 0/5 6 8/g; s/5 3 0/5 3 8/g; s/5 0 0/5 0 8/g; s/6 0 0/6 0 8/g; s/6 1 0/6 1 8/g' rpi_sym.vkm
```
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## Stuff
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Ultimate keybindings?
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```
F9 = shift+return
F10 = Ultimate menu
F11 = Freeze
F12 = Restore
LCTRL = Control
LWIN = CBM
INS = Inst
HOME = Clr/home
PAUSE = run/stop
SCROLL_LOCK = Ultimate menu
BACKSPACE = Inst/del
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LSHIFT+LCTRL+LWIN+LALT = Reset
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Buttons: Freeze-Menu-Reset
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```
