4 layers144.3 × 143.8 mm
2 layers55.1 × 67 mm
Cartridge for Atari 8-bit Computers
SeanCline/atari8bitcart2Cartridge for 8-Bit Atari Computers (400/800/XL/XE)
- Size
- 55.1 × 67 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 34
- Pads
- 113
- Tracks, vias
- 461, 119
- Pours
- 28
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 21 Apr 2026
- Updated
- 28 May 2026
Overview
Cartridge for Atari 8-bit Computers is an open-source printed circuit board by SeanCline, from the SeanCline/atari8bitcart repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 55.1 × 67 mm with 15 parts on 34 nets, routed with 461 tracks and 119 vias.
It is built around the 27C128-15 and 74AHCT1G08SE. Its parts include 3 ICs, 2 capacitors and 1 connector. It belongs with the retro computing and games boards of this library.
Main components
227C128-15
-0℃~+70℃ 128Kbit 4.5V~5.5V Parallel Port (Parallel) - Non-Volatile Memory (ROM)Microchip TechnologyNon-Volatile Memory (ROM)
74AHCT1G08SE
SOT-353-40℃~+125℃ 1 100mV、550mV 2 2V 3.94V、4.4V~4.5V 4.5V~5.5V 40uA 7.9ns@5V,50pF 74AHCT Series 800mV 8mA 8mA AND Gate Push-pull Schmitt trigger SOT-353 Logic Gates ROHSDiodes IncorporatedLogic Gates
README
README.mdCartridge for 8-Bit Atari Computers (400/800/XL/XE)
Configurable Atari 8-bit cartridge PCB for the Atari 400/800/XL/XE line of home computers.
- Single 8 KB mode using one 2764-compatible PROM in the right-hand socket.
- Dual 8 KB + 8 KB mode using two 2764-compatible PROMs.
- Single 16 KB mode using one 27128-compatible PROM in the right-hand socket along with a
74AHCT1G08for chip-enable logic.
Hardware Summary
- U0: accepts either:
- a 2764-compatible (8 KB) PROM for both 8KB and 8KB+8KB configurations.
- a 27128-compatible (16 KB) PROM for 16 KB configurations.
- U1: accepts a 2764-compatible (8 KB) PROM in the 8KB+8KB configuration.
- U2:
74AHCT1G08single AND gate used to merge the two chip-enable lines (/S4 and /S5) into a single signal for the 16KB configuration. - C0 / C1: 100 nF bypass capacitors.
Jumper Configuration
The jumpers are organized into sections, one for each supported configuration.
ℹ️ Bridge only the jumpers required for the configuration you intend to use.
Releases
The latest gerber files can be found in the build artifacts section of the Actions tab. At the moment, the gerbers are generated for JLCPCB, but it should be pretty easy to send them to a PCB fab of your choosing.
Schematic
License
CERN-OHL-W-2.0
See LICENSE.txt.
Trademark notice: Atari is a trademark of its respective owner. This project is an independent, unofficial hardware design and is not affiliated with or endorsed by Atari.
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | /S5_U0_Enable | Atari_8-bit:SolderJumper | JP2, JP5 |
| 2 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C0, C1 |
| 1 | /S4&/S5_U0_Enable | Atari_8-bit:SolderJumper | JP9 |
| 1 | /S4_U1_Enable | Atari_8-bit:SolderJumper | JP6 |
| 1 | 27C128 | Package_DIP:DIP-28_W15.24mm | U0 |
| 1 | 27C64 | Package_DIP:DIP-28_W15.24mm | U1 |
| 1 | 74AHCT1G08 | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U2 |
| 1 | Atari 8-bit Left Cartridge Connector | Atari_8-bit:Atari_8-bit_Cartridge_Connector | J1 |
| 1 | High_Bank_Present_16KB | Atari_8-bit:SolderJumper | JP8 |
| 1 | High_Bank_Present_8+8KB | Atari_8-bit:SolderJumper | JP4 |
| 1 | High_Bank_Present_8KB | Atari_8-bit:SolderJumper | JP1 |
| 1 | Low_Bank_Present_16KB | Atari_8-bit:SolderJumper | JP7 |
| 1 | Low_Bank_Present_8+8KB | Atari_8-bit:SolderJumper | JP3 |
Questions
How big is the Cartridge for Atari 8-bit Computers PCB?
It measures 55.1 × 67 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Cartridge for Atari 8-bit Computers use?
15 parts, built around the 27C128-15 and 74AHCT1G08SE. 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 Cartridge for Atari 8-bit Computers KiCad files?
From the SeanCline/atari8bitcart repository on GitHub, at the commit this page was made from: the board is Cartridge for Atari 8-bit Computers.kicad_pcb and its schematic Cartridge for Atari 8-bit Computers.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cartridge for Atari 8-bit Computers design in my own project?
Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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