VERSION 2 IS CURRENTLY BEING DEVELOPED.

PLEASE USE VERSION 1 FOR MAINSTREAM USE

EVENTUALLY VERSION 2 WILL WORK WITH VERSION 1 HARDWARE

ESSENTAILLY THE AY & AX ADDRESS PINS ARE MIRRORED

SEE WIRING DIFFERENCE TEXT FOR DETAILS ON WHAT PINS TO SWAP TO USE VERSION 2 ON VERSION 1 HARDWARE

C64 PS2/USB Keyboard (VERSION 1)

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

• SEEED XIAO uses slightly modified USBHOST Arduino library (C64_USB_Host_Library_SAMD). This directory will need to be copied into the Arduino library directory.

• SEEED XIAO will need its board driver installed into the Arduino IDE. See manufacturers instructions.

• DUE also uses a modified USBHOST library but it is included with the source and does not need to be installed in the library directory.

Hardware

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

• 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 - SEEED XIAO is highly recommended as the DUE is overkill for this project

  • Requires SEEED XIAO or DUE. In most cases, the SEED requires USB Type C to USB A or 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

• KEYBIN.PDF

  • 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.
  • The logic hole column only applies to the MT8812-16.

• DEFAULTKEY.TXT

  • Key map of special function keys (EX. C= key mapped to Windows key)

• USB_KEY_CODES.TXT

  • Public Domain copy of USB HID scan codes.

• Schematic PDF files

  • Include wiring charts and are located in the PS2 and USB folders under the appropriate board type
  • MT8808 and MT8812-16 are separate due to a different MT88xx pinouts

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 FALSE IF USING MT8812-16.

!!!POWER REQUIREMENTS!!!!

• The Arduino UNO, Nano, and SEEED 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

• Create spreadsheet/program to automatically create key maps

• Publish pre-compiled binary files

Version 1.00

• Updated and cleaned up all schematics and documents. All wiring charts are now on the schematics.

• DUE has been brought out of archive status and will be part of future updates.

Version 0.920

• Add SEEED XIAO board for USB keyboards

• Document DUE is for archive only

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)