# RetroDevEm
<img src="pictures/retrodevem-v2.0-in-action-lowres.jpg" alt="RetroDevEm in action"/>
RetroDevEm (Retro Device Emulator) is a free (as in Free Software)
input devices (mouse and joystick) emulator for retro consoles and
computers (Atari 2600, Atari ST, Amstrad CPC, ...). It allows using
any input device, recognized by Linux on the Raspberry Pi, on
unmodifed retro machines. Programs collect events from input devices
and send the corresponding signals to the console or computer.
The project consists of 2 components:
- Hardware: A daughter printed circuit board, to be plugged on a Raspberry Pi;
- Software: Programs running on the Raspberry Pi.
The daughter board can be connected to the retro machines via DB-9
flat cables.
## Project focus
This project focuses on:
- Using off the shelf hardware ;
- Devices accuracy and low latency ;
- Simplicity ;
- Low CPU usage.
## Rationale
I bought a 30 Euros Atari ST mouse adapter from a hobbyist. It only
works with ps/2 mice and the accuracy is okish. Especially with slow
movements, the Atari ST pointer accuracy is bad. So why not do
something better and make it free software ?
## Project details
### Hardware
<img src="pictures/rde-board-v2.0-fixed.jpg" alt="RetroDevEm Board v2.0 fixed"/>
A PCB (Printed Circuit Board), with:
- 2x ULN2003AN ICs (7 Darlington transistors per IC)
- 14x 15 KOhms resistors (optional)
- 1x 40 pins socket (Raspberry Pi connector)
- 2x 10 pins headers (Atari ports connectors)
#### About the resistors
Without resistors, the design works perfectly well. The current drawn
on the Raspberry PI GPIO pins is 706 uA, for a 440 uA current flowing
out of the Atari ST mouse/joystick port.
With 15 KOhms resistors, the design works perfectly as well. The
current on the Raspberry Pi GPIO pins in 113 uA, for a 440 uA current
on the Atari ST port side.
#### Board wiring
| RPI sig. | J1 pin | J2/J3 pins | Atari ST signals | Amstrad CPC sig. | Atari 2600 sig. |
|----------|--------|------------|-----------------------|------------------|-----------------|
| GPIO2 | 3 | J2 9 | P0 Right Button | COM2 (GND Joy 2) | Pot 1 (analog) |
| GPIO3 | 5 | J2 5 | P0 Port 0 enable | Fire 3 (undoc) | Pot 0 (analog) |
| GPIO4 | 7 | J2 4 | P0 YB / Right | Right | Right |
| GPIO17 | 11 | J2 3 | P0 YA / Left | Left | Left |
| GPIO27 | 13 | J2 2 | P0 XA / Down | Down | Down |
| GPIO22 | 15 | J2 1 | P0 XB / Up | Up | Up |
| GPIO10 | 19 | J2 6 | P0 Left Button / Fire | Fire 2 (default) | Fire |
| GPIO9 | 21 | J3 9 | P1 Right Button | | |
| GPIO11 | 23 | J3 5 | P1 Port 0 enable | | |
| GPIO0 | 27 | J3 4 | P1 YB / Right | | |
| GPIO5 | 29 | J3 3 | P1 YA / Left | | |
| GPIO6 | 31 | J3 2 | P1 XA / Down | | |
| GPIO13 | 33 | J3 1 | P1 XB / Up | | |
| GPIO19 | 35 | J3 6 | P1 Left Button / Fire | | |
#### Generating the gerber files
In Kicad PCB editor:
- Run the DRC (Design Rule Checker)
- File -> Fabrication outputs -> Gerbers
- Select the output directory
- Include every layer except Margin, F.Courtyard and B.Courtyard
- Keep only the following "General Options" checked:
- Plot the reference designators
- Check zone fills before plotting
- Keep the default "Gerber Options"
- Click "Plot" button
- Then click on "Generate Drill Files..."
- In the "Drill File Format" section, select "Gerber X2"
- Then click "Generate Drill File"
- Create a zip archive from the gerber folder.
The generated archive can be checked in Kicad's Gerber viewer.
### Software
The RetroDevEm programs need to be installed on a Raspberry Pi
connected to the Atari ST through the RetroDevEm board (an RPI
daughter board). The programs process events from input devices
(mouse, gamepad) and send corresponding signals to the retro machine
connected to the board.
#### Installation
You need to create a virtualenv on your Raspberry Pi and activate it:
```
$ virtualenv venv/retrodevem
created virtual environment CPython3.11.2.final.0-64 in 353ms
creator CPython3Posix(dest=/home/florent/venv/retrodevem, clear=False, no_vcs_ignore=False, global=False)
seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/florent/.local/share/virtualenv)
added seed packages: pip==23.0.1, setuptools==66.1.1, wheel==0.38.4
activators BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator,PythonActivator
$ source venv/retrodevem/bin/activate
```
Then RetroDevEm can be install with pip:
```
$ pip install retrodevem
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting retrodevem
Using cached retrodevem-0.2-py3-none-any.whl (22 kB)
Collecting click
Using cached https://www.piwheels.org/simple/click/click-8.1.7-py3-none-any.whl (97 kB)
Collecting gpiozero
Using cached https://www.piwheels.org/simple/gpiozero/gpiozero-2.0.1-py3-none-any.whl (150 kB)
Collecting lgpio
Using cached lgpio-0.2.2.0-cp311-cp311-manylinux_2_34_aarch64.whl (364 kB)
Collecting colorzero
Using cached https://www.piwheels.org/simple/colorzero/colorzero-2.0-py2.py3-none-any.whl (26 kB)
Requirement already satisfied: setuptools in ./venv/retrodevem/lib/python3.11/site-packages (from colorzero->gpiozero->retrodevem) (66.1.1)
Installing collected packages: lgpio, colorzero, click, gpiozero, retrodevem
Successfully installed click-8.1.7 colorzero-2.0 gpiozero-2.0.1 lgpio-0.2.2.0 retrodevem-0.2
```
#### Usage
Identify the input device files using `evtest`:
```
$ evtest
No device specified, trying to scan all of /dev/input/event*
Not running as root, no devices may be available.
Available devices:
/dev/input/event0: vc4-hdmi-0
/dev/input/event1: vc4-hdmi-0 HDMI Jack
/dev/input/event2: vc4-hdmi-1
/dev/input/event3: vc4-hdmi-1 HDMI Jack
/dev/input/event4: Sony Interactive Entertainment Wireless Controller
/dev/input/event5: Sony Interactive Entertainment Wireless Controller Motion Sensors
/dev/input/event6: Sony Interactive Entertainment Wireless Controller Touchpad
/dev/input/event7: Logitech USB Optical Mouse
Select the device event number [0-7]: ^C
```
Run the `atarist-mouse` program to emulate a mouse on the Atari ST:
```
$ atarist-mouse --device /dev/input/event7 &
[1] 1947
```
Run the `atarist-joystick` program to emulate a joystick on the Atari ST:
```
$ atarist-joystick --device /dev/input/event4 &
[2] 1951
```
Available options for the `atarist-mouse` program:
```
$ atarist-mouse --help
Usage: atarist-mouse [OPTIONS]
Send mouse events to an Atari ST connected to the RetroDevEm board. Usage
example: atarist-mouse --board v2.0 --device /dev/input/event0 --port 0
--speed 4
Options:
--board TEXT Board revision. [default: v2.0]
--device TEXT Input device to use. [default: /dev/input/event0]
--port INTEGER Board/Atari port to connect the mouse to. [default:
0]
--speed INTEGER Mouse speed divider (more = slower). [default: 2]
--debug / --no-debug Display debugging information. [default: no-debug]
--help Show this message and exit.
```
Available options for the `atarist-joystick` program:
```
$ atarist-joystick --help
Usage: atarist-joystick [OPTIONS]
Send joystick/gamepad events to an Atari ST connected to the RetroDevEm
board. Usage example: atarist-joystick --board v2.0 --device
/dev/input/event0 --port 0
Options:
--board TEXT Board revision. [default: v2.0]
--device TEXT Input device to use. [default: /dev/input/event0]
--port INTEGER Board/Atari ST port to connect the joystick to.
[default: 1]
--debug / --no-debug Display debugging information. [default: no-debug]
--help Show this message and exit.
```
### Additional information
- [Sourcing](sourcing.md)
- [Mechanical details](mechanical.md)
#### Consoles and computers DB9 wiring
##### Atari ST
| DB9 pins | Mouse P0 | Joystick P0 | Joystick P1 |
|----------|---------------------|------------------------|-------------|
| 1 | XB | Up | Up |
| 2 | XA | Down | Down |
| 3 | YA | Left | Left |
| 4 | YB | Right | Right |
| 5 | | | P0 enable |
| 6 | Left But | Fire | Fire |
| 7 | +5V | +5V | +5V |
| 8 | GND | GND | GND |
| 9 | Right But | | |
##### Amstrad CPC & Atari 2600 Joystick
| DB9 pins | Amstrad CPC | Atari 2600 |
|----------|------------------|----------------|
| 1 | Up | Up |
| 2 | Down | Down |
| 3 | Left | Left |
| 4 | Right | Right |
| 5 | Fire 3 (undoc) | Pot 0 (analog) |
| 6 | Fire 2 (default) | Fire |
| 7 | Fire 1 (extra) | +5V |
| 8 | COM1 (joy1) | GND |
| 9 | COM2 (joy2) | Pot 1 (analog |
Sources:
- [cpcwiki](https://www.cpcwiki.eu/index.php/Connector:Digital_joystick)
- [Atari ST Internals - page 73](https://archive.org/details/Atari_ST-Internals/page/72/mode/2up)
The first version will focus on the following use cases:
- Atari 2600: 1 joystick
- Atari ST: 1 mouse + 1 joystick
- Atari ST: 2 joysticks
- Amstrad CPC: 1 joystick
#### Schematics
<img src="pictures/retrodevem-v2.1-schematic.png" alt="RetroDevEm v2.1 schematic"/>
## Current status
### Atari ST
- Mouse emulation is working. Latency is below 20 ms (i.e 1 frame at
50 Hz) and CPU usage is below 10% of a core, for normal usage.
- Joystick emulation is working. No latency, CPU usage below 1% of a
core.
## Todo
- Configure RPI GPIO pins to pull-down input by default;
- Write blog article about the project.
- Implement auto-fire;
- Use [python-evdev][5] instead of custom `inputdevice` module.
## Links
- [Incremental encoder on Wikipedia][4]: describes the mouse signal
expected by the Atari ST ;
- [ATARIPiMouse Github][1]: inspiration for writing the emulator in Python ;
- [Yaumataca][2]: inspiration for the "quadrature encoder" ;
- [Atari-Quadrature-USB-Mouse-Adapter][3]
[1]:https://github.com/backofficeshow/ATARIPiMouse
[2]:https://github.com/Slamy/Yaumataca
[3]:https://github.com/jjmz/Atari-Quadrature-USB-Mouse-Adapter
[4]:https://en.wikipedia.org/wiki/Incremental_encoder
[5]:https://python-evdev.readthedocs.io/en/latest/usage.html
Raw data
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"description": "# RetroDevEm\n\n<img src=\"pictures/retrodevem-v2.0-in-action-lowres.jpg\" alt=\"RetroDevEm in action\"/>\n\nRetroDevEm (Retro Device Emulator) is a free (as in Free Software)\ninput devices (mouse and joystick) emulator for retro consoles and\ncomputers (Atari 2600, Atari ST, Amstrad CPC, ...). It allows using\nany input device, recognized by Linux on the Raspberry Pi, on\nunmodifed retro machines. Programs collect events from input devices\nand send the corresponding signals to the console or computer.\n\nThe project consists of 2 components:\n- Hardware: A daughter printed circuit board, to be plugged on a Raspberry Pi;\n- Software: Programs running on the Raspberry Pi.\n\nThe daughter board can be connected to the retro machines via DB-9\nflat cables.\n\n## Project focus\n\nThis project focuses on:\n- Using off the shelf hardware ;\n- Devices accuracy and low latency ;\n- Simplicity ;\n- Low CPU usage.\n\n## Rationale\n\nI bought a 30 Euros Atari ST mouse adapter from a hobbyist. It only\nworks with ps/2 mice and the accuracy is okish. Especially with slow\nmovements, the Atari ST pointer accuracy is bad. So why not do\nsomething better and make it free software ?\n\n## Project details\n\n### Hardware\n\n<img src=\"pictures/rde-board-v2.0-fixed.jpg\" alt=\"RetroDevEm Board v2.0 fixed\"/>\n\nA PCB (Printed Circuit Board), with:\n- 2x ULN2003AN ICs (7 Darlington transistors per IC)\n- 14x 15 KOhms resistors (optional)\n- 1x 40 pins socket (Raspberry Pi connector)\n- 2x 10 pins headers (Atari ports connectors)\n\n#### About the resistors\n\nWithout resistors, the design works perfectly well. The current drawn\non the Raspberry PI GPIO pins is 706 uA, for a 440 uA current flowing\nout of the Atari ST mouse/joystick port.\n\nWith 15 KOhms resistors, the design works perfectly as well. The\ncurrent on the Raspberry Pi GPIO pins in 113 uA, for a 440 uA current\non the Atari ST port side.\n\n#### Board wiring\n\n| RPI sig. | J1 pin | J2/J3 pins | Atari ST signals | Amstrad CPC sig. | Atari 2600 sig. |\n|----------|--------|------------|-----------------------|------------------|-----------------|\n| GPIO2 | 3 | J2 9 | P0 Right Button | COM2 (GND Joy 2) | Pot 1 (analog) |\n| GPIO3 | 5 | J2 5 | P0 Port 0 enable | Fire 3 (undoc) | Pot 0 (analog) |\n| GPIO4 | 7 | J2 4 | P0 YB / Right | Right | Right |\n| GPIO17 | 11 | J2 3 | P0 YA / Left | Left | Left |\n| GPIO27 | 13 | J2 2 | P0 XA / Down | Down | Down |\n| GPIO22 | 15 | J2 1 | P0 XB / Up | Up | Up |\n| GPIO10 | 19 | J2 6 | P0 Left Button / Fire | Fire 2 (default) | Fire |\n| GPIO9 | 21 | J3 9 | P1 Right Button | | |\n| GPIO11 | 23 | J3 5 | P1 Port 0 enable | | |\n| GPIO0 | 27 | J3 4 | P1 YB / Right | | |\n| GPIO5 | 29 | J3 3 | P1 YA / Left | | |\n| GPIO6 | 31 | J3 2 | P1 XA / Down | | |\n| GPIO13 | 33 | J3 1 | P1 XB / Up | | |\n| GPIO19 | 35 | J3 6 | P1 Left Button / Fire | | |\n\n#### Generating the gerber files\n\nIn Kicad PCB editor:\n- Run the DRC (Design Rule Checker)\n- File -> Fabrication outputs -> Gerbers\n- Select the output directory\n- Include every layer except Margin, F.Courtyard and B.Courtyard\n- Keep only the following \"General Options\" checked:\n - Plot the reference designators\n - Check zone fills before plotting\n- Keep the default \"Gerber Options\"\n- Click \"Plot\" button\n- Then click on \"Generate Drill Files...\"\n- In the \"Drill File Format\" section, select \"Gerber X2\"\n- Then click \"Generate Drill File\"\n- Create a zip archive from the gerber folder.\n\nThe generated archive can be checked in Kicad's Gerber viewer.\n\n### Software\n\nThe RetroDevEm programs need to be installed on a Raspberry Pi\nconnected to the Atari ST through the RetroDevEm board (an RPI\ndaughter board). The programs process events from input devices\n(mouse, gamepad) and send corresponding signals to the retro machine\nconnected to the board.\n\n#### Installation\n\nYou need to create a virtualenv on your Raspberry Pi and activate it:\n\n```\n$ virtualenv venv/retrodevem\ncreated virtual environment CPython3.11.2.final.0-64 in 353ms\n creator CPython3Posix(dest=/home/florent/venv/retrodevem, clear=False, no_vcs_ignore=False, global=False)\n seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/florent/.local/share/virtualenv)\n added seed packages: pip==23.0.1, setuptools==66.1.1, wheel==0.38.4\n activators BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator,PythonActivator\n$ source venv/retrodevem/bin/activate\n```\n\nThen RetroDevEm can be install with pip:\n\n```\n$ pip install retrodevem\nLooking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple\nCollecting retrodevem\n Using cached retrodevem-0.2-py3-none-any.whl (22 kB)\nCollecting click\n Using cached https://www.piwheels.org/simple/click/click-8.1.7-py3-none-any.whl (97 kB)\nCollecting gpiozero\n Using cached https://www.piwheels.org/simple/gpiozero/gpiozero-2.0.1-py3-none-any.whl (150 kB)\nCollecting lgpio\n Using cached lgpio-0.2.2.0-cp311-cp311-manylinux_2_34_aarch64.whl (364 kB)\nCollecting colorzero\n Using cached https://www.piwheels.org/simple/colorzero/colorzero-2.0-py2.py3-none-any.whl (26 kB)\nRequirement already satisfied: setuptools in ./venv/retrodevem/lib/python3.11/site-packages (from colorzero->gpiozero->retrodevem) (66.1.1)\nInstalling collected packages: lgpio, colorzero, click, gpiozero, retrodevem\nSuccessfully installed click-8.1.7 colorzero-2.0 gpiozero-2.0.1 lgpio-0.2.2.0 retrodevem-0.2\n```\n\n#### Usage\n\nIdentify the input device files using `evtest`:\n\n```\n$ evtest\nNo device specified, trying to scan all of /dev/input/event*\nNot running as root, no devices may be available.\nAvailable devices:\n/dev/input/event0: vc4-hdmi-0\n/dev/input/event1: vc4-hdmi-0 HDMI Jack\n/dev/input/event2: vc4-hdmi-1\n/dev/input/event3: vc4-hdmi-1 HDMI Jack\n/dev/input/event4: Sony Interactive Entertainment Wireless Controller\n/dev/input/event5: Sony Interactive Entertainment Wireless Controller Motion Sensors\n/dev/input/event6: Sony Interactive Entertainment Wireless Controller Touchpad\n/dev/input/event7: Logitech USB Optical Mouse\nSelect the device event number [0-7]: ^C\n```\n\nRun the `atarist-mouse` program to emulate a mouse on the Atari ST:\n\n```\n$ atarist-mouse --device /dev/input/event7 &\n[1] 1947\n```\n\nRun the `atarist-joystick` program to emulate a joystick on the Atari ST:\n\n```\n$ atarist-joystick --device /dev/input/event4 &\n[2] 1951\n```\n\nAvailable options for the `atarist-mouse` program:\n\n```\n$ atarist-mouse --help\nUsage: atarist-mouse [OPTIONS]\n\n Send mouse events to an Atari ST connected to the RetroDevEm board. Usage\n example: atarist-mouse --board v2.0 --device /dev/input/event0 --port 0\n --speed 4\n\nOptions:\n --board TEXT Board revision. [default: v2.0]\n --device TEXT Input device to use. [default: /dev/input/event0]\n --port INTEGER Board/Atari port to connect the mouse to. [default:\n 0]\n --speed INTEGER Mouse speed divider (more = slower). [default: 2]\n --debug / --no-debug Display debugging information. [default: no-debug]\n --help Show this message and exit.\n```\n\nAvailable options for the `atarist-joystick` program:\n\n```\n$ atarist-joystick --help\nUsage: atarist-joystick [OPTIONS]\n\n Send joystick/gamepad events to an Atari ST connected to the RetroDevEm\n board. Usage example: atarist-joystick --board v2.0 --device\n /dev/input/event0 --port 0\n\nOptions:\n --board TEXT Board revision. [default: v2.0]\n --device TEXT Input device to use. [default: /dev/input/event0]\n --port INTEGER Board/Atari ST port to connect the joystick to.\n [default: 1]\n --debug / --no-debug Display debugging information. [default: no-debug]\n --help Show this message and exit.\n```\n\n### Additional information\n\n- [Sourcing](sourcing.md)\n- [Mechanical details](mechanical.md)\n\n#### Consoles and computers DB9 wiring\n\n##### Atari ST\n\n| DB9 pins | Mouse P0 | Joystick P0 | Joystick P1 |\n|----------|---------------------|------------------------|-------------|\n| 1 | XB | Up | Up |\n| 2 | XA | Down | Down |\n| 3 | YA | Left | Left |\n| 4 | YB | Right | Right |\n| 5 | | | P0 enable |\n| 6 | Left But | Fire | Fire |\n| 7 | +5V | +5V | +5V |\n| 8 | GND | GND | GND |\n| 9 | Right But | | |\n\n##### Amstrad CPC & Atari 2600 Joystick\n\n| DB9 pins | Amstrad CPC | Atari 2600 |\n|----------|------------------|----------------|\n| 1 | Up | Up |\n| 2 | Down | Down |\n| 3 | Left | Left |\n| 4 | Right | Right |\n| 5 | Fire 3 (undoc) | Pot 0 (analog) |\n| 6 | Fire 2 (default) | Fire |\n| 7 | Fire 1 (extra) | +5V |\n| 8 | COM1 (joy1) | GND |\n| 9 | COM2 (joy2) | Pot 1 (analog |\n\nSources:\n- [cpcwiki](https://www.cpcwiki.eu/index.php/Connector:Digital_joystick)\n- [Atari ST Internals - page 73](https://archive.org/details/Atari_ST-Internals/page/72/mode/2up)\n\nThe first version will focus on the following use cases:\n- Atari 2600: 1 joystick\n- Atari ST: 1 mouse + 1 joystick\n- Atari ST: 2 joysticks\n- Amstrad CPC: 1 joystick\n\n#### Schematics\n\n<img src=\"pictures/retrodevem-v2.1-schematic.png\" alt=\"RetroDevEm v2.1 schematic\"/>\n\n## Current status\n\n### Atari ST\n\n- Mouse emulation is working. Latency is below 20 ms (i.e 1 frame at\n 50 Hz) and CPU usage is below 10% of a core, for normal usage.\n- Joystick emulation is working. No latency, CPU usage below 1% of a\n core.\n\n## Todo\n\n- Configure RPI GPIO pins to pull-down input by default;\n- Write blog article about the project.\n- Implement auto-fire;\n- Use [python-evdev][5] instead of custom `inputdevice` module.\n\n## Links\n\n- [Incremental encoder on Wikipedia][4]: describes the mouse signal\n expected by the Atari ST ;\n- [ATARIPiMouse Github][1]: inspiration for writing the emulator in Python ;\n- [Yaumataca][2]: inspiration for the \"quadrature encoder\" ;\n- [Atari-Quadrature-USB-Mouse-Adapter][3]\n\n[1]:https://github.com/backofficeshow/ATARIPiMouse\n[2]:https://github.com/Slamy/Yaumataca\n[3]:https://github.com/jjmz/Atari-Quadrature-USB-Mouse-Adapter\n[4]:https://en.wikipedia.org/wiki/Incremental_encoder\n[5]:https://python-evdev.readthedocs.io/en/latest/usage.html\n",
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"summary": "RetroDevEm (Retro Device Emulator) is a free (as in Free Software) input devices (mouse and joystick) emulator for retro consoles and computers (Atari 2600, Atari ST, Amstrad CPC, ...).",
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JSON
