2 layers50 × 23.2 mm
Analog
hoglet67/RGBtoHDMI
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
32 parts1kGPL-3.0
2 layers67.6 × 99.3 mm
Atari keypad
hansliss/atari_keypad1A 12-key keypad for the joystick port, based on the Atari 2600 keypad
- Size
- 67.6 × 99.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 20
- Pads
- 153
- Tracks, vias
- 359, 0
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 26 Jan 2021
- Updated
- 28 Jan 2021
Overview
Atari keypad is an open-source printed circuit board by hansliss, from the hansliss/atari_keypad repository on GitHub, published under the BSD-2-Clause licence. It is a 2-layer board of 67.6 × 99.3 mm with 32 parts on 20 nets, routed with 359 tracks and 0 vias.
Its parts include 12 diodes, 12 switches, 3 resistors and 1 connector. It belongs with the keyboards and input and retro computing and games boards of this library.
README
README.mdatari_keypad
A 12-key keypad for the joystick port, based on the Atari 2600 keypad
The keypad uses Kailh sockets for Cherry MX-compatible keyswitches, and is meant to be used with a 3d-printed box, including a faceplate to keep the switches in place. This box has not been designed yet.
The keypad has anti-ghosting diodes on all keys. There are three pull-up resistors, one for each column. The original keypad only included the first two resistors, and as far as I know, the third one is not needed.
The design includes a PCB-mounted DB-9 female connector. You can use this with a straight, fully connected DB-9 male-to-female cable to connect the keypad to a computer or console, or you can just solder cables to the solder pads if you prefer that.
Included is also VIC-20 code for scanning the keypad. It includes full N-key rollover and produces two bytes of bits, one bit for each key. Debouncing is done by delaying keypress events until they have been seen by at least two scanning cycles.
There is a second machine code program that calls the poller and then "unpacks" the bit fields into a series of individual bytes, one for each key. This is because BASIC turns out to be breathtakingly slow at this kind of bit-mangling.
There are two BASIC programs, one that uses just the main subroutine and does the bit unpacking itself, and another on that uses the "reorg" subroutine to to get unpacked bytes. The second one is a little bit faster.
Finally, there is a machine code version of the BASIC code, which better demonstrates the keypad at full speed.
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | D | Diodes_SMD:D_0603 | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 |
| 3 | 4k7 | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3 |
| 1 | DB9_Female | Connectors_DSub:DSUB-9_Female_Horizontal_P2.77x2.84mm_EdgePinOffset4.94mm_Housed_MountingHolesOffset7.48mm | J1 |
| 1 | SW_0 | keyswitches:Kailh_socket_MX_optional_compatible | SW11 |
| 1 | SW_1 | keyswitches:Kailh_socket_MX_optional_compatible | SW1 |
| 1 | SW_2 | keyswitches:Kailh_socket_MX_optional_compatible | SW2 |
| 1 | SW_3 | keyswitches:Kailh_socket_MX_optional_compatible | SW3 |
| 1 | SW_4 | keyswitches:Kailh_socket_MX_optional_compatible | SW4 |
| 1 | SW_5 | keyswitches:Kailh_socket_MX_optional_compatible | SW5 |
| 1 | SW_6 | keyswitches:Kailh_socket_MX_optional_compatible | SW6 |
| 1 | SW_7 | keyswitches:Kailh_socket_MX_optional_compatible | SW7 |
| 1 | SW_8 | keyswitches:Kailh_socket_MX_optional_compatible | SW8 |
| 1 | SW_9 | keyswitches:Kailh_socket_MX_optional_compatible | SW9 |
| 1 | SW_Hash | keyswitches:Kailh_socket_MX_optional_compatible | SW12 |
| 1 | SW_Star | keyswitches:Kailh_socket_MX_optional_compatible | SW10 |
The 28 most common of 32 parts.
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Questions
How big is the Atari keypad PCB?
It measures 67.6 × 99.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Atari keypad use?
32 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Atari keypad KiCad files?
From the hansliss/atari_keypad repository on GitHub, at the commit this page was made from: the board is Atari_keypad.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Atari keypad design in my own project?
Its repository publishes it under the BSD-2-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).