C64 PS2/USB Keyboard

This version is incompatible with the original https://github.com/Hartland/C64-Keyboard

See https://easyeda.com/jarkko.sonninen/cbm-ps2b for hardware

Some keymapping is still wrong

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This project is designed to allow a PS2/USB keyboard to be used with a Commodore 64 in place of the original Commodore keyboard.

Dependencies

• PS2KeyAdvanced Arduino library for use with PS2 keyboard. Install through the IDE library manager.

• A slightly modified USBHOST Arduino library is included for use with USB keyboard.

Hardware

• Arduino Uno, Nano, or DUE. DUE required for USB keyboard.

• It is strongly recommended to use DUE for USB only. The cost of the DUE and its required level shifters for PS2 connections make it impractical for PS2 implementation.

• MT8808, MT8812 or MT8816 Analog Switch Array.

• 20 pin female header or male header with cable (PATA cable will work)

• Arduino shield PCB.

  • Any universal PCB that will line up correctly.

• PS2 keyboard

  • matching socket or cut/strip and directly wire.

• USB keyboard

  • Requires DUE and in most cases, USB Type A to USB Micro Type B cable/adapter.
  • Keyboards that connect through internal USB hubs are not supported.This is a limitation of the USBHost library.
  • Restore (NMI) key requires a NPN transistor (2n3904 suggested) and resistor (10K).

Documents

• MT88XX.xml

  • Basic wiring charts. Separate tabs for MT8808 and MT8812/MT8816. Wiring charts are also on the schematics.

• MT8808.pdf and MT8812-16.pdf MT8808 is separate due to a different IC pinout to MT8812-16

  • PDF versions for the wiring charts

• KEYBIN.xml

  • MT88XX AY/AX. These are the hard wired Commodore keyboard header position values used in keyboard mapping.
  • The position values are placed on the keymap where the PS2/USB keyboard value matches the Commodore key desired.
  • The AX2-1-0 AY2-1-0 and logic hole hole columns are for reference and not needed to make keymaps.

• DEFAULTKEY

  • Included key map document

• Schematic_MT8812-16.pdf and Schematic_MT8808.PDF.These are located in the PS2/doc and USB/doc folders. -Schematic diagrams. MT8808 is separate due to a different IC pinout to MT8812-16

Usage

• PS2 keyboards use the PS2KeyAdvanced library. -Use Manage Library to search for and install PS2KeyAdvanced.

• USB Keyboards use the included modified USBHOST.

• Using the Arduino IDE upload the sketch: C64_keyboard.ino into your Arduino.

• SYSTEM OPTIONS ARE LOCATED IN THE C64KEYBOARD.H HEADER FILE. THE MT8808 DEFINITION IS VERY IMPORTANT. SET TO TRUE IF USING A MT8808 OR FLASE IF USING MT8812-16.

!!!POWER REQUIREMENTS!!!!

• The Arduino UNO and Nano can be powered from the C64 keyboard header Pin 4

• The Arduino DUE CANNOT BE POWERED FROM PIN 4!! Use the + side of C10 (+10V) connected to the DUE barrel power connector instead.

TODO

• Code cleanup

• Write spreadsheet/program to ease creation of keymaps

Version 0.911

• USB IDE library requirement removed

Version 0.91

• USB module published

Version 0.9

• Code rewrite using PS2KeyAdvanced library

• Several bugs have been fixed

• Speed and reliability have been greatly improved

• Up to 2 key maps can be stored and hot swapped with assigned keys (Default F9-F10)