jsanpe/ZaxCart7A kicad implementation of a C64 cartridge with potential to be used as a Super Zaxxon compatible cart
ZaxCart is an open-source printed circuit board by jsanpe, from the jsanpe/ZaxCart repository on GitHub, published under the MIT licence. It is a 2-layer board of 58.4 × 50.8 mm with 8 parts on 44 nets, routed with 227 tracks and 16 vias.
It is built around the 74LS00SC and 74LS74PC. Its parts include 4 ICs, 3 capacitors and 1 connector.
A kicad implementation of a C64 cartridge with potential to be used as a Super Zaxxon compatible cart
This Kicad project implements a C64 cartridge with an EEPROM socket and some external logic that can be use from the C64. A similar concept was used for the Super Zaxxon cartridge, which theoretically this cart could support. Its main purpose is to be able to test PLA and other ICs from the C64 by running particularly demanding code to stress the whole system.
This PCB is directly derived from the OpenC64Cart by SukkoPera, so all the credit for him for most of the footprints used.
This is a pretty straightforward 2-layer PCB with few components. The gerbers attached can be directly used to get the PCB manufactured for you. It is important for the health of the C64 to ask for bevelled edges with Immersion (ENIG) or Hard Gold contacts. These extra features will cost you some extra cash, but will save you issues with your machines in the long run.
The PCB has been designed to use SMD capacitors. I went for 0805s as this size is pretty manageable and allows for using 0603s (which is my main inventory) without issue. The capacitors are located below the sockets for the ICs, so remember to solder them first :)
This project does not include any particular firmware. Depending on your target use, you may find this page about replicating the Super Zaxxon cart useful. You can of course code your own C64 applications. In any case, a good EEPROM programmer and a batch of 27512 memories will come extra handy. Remember to buy the eletrically erasable parts, they are dirt cheap and really convenient.
Note: I will not be responding any issues or questions regarding firmware/software to be used with this cart.
| Value | Designator | Footprint |
|---|---|---|
| 100nF | C1, C2,C3 | Capacitor_SMD:C_0805 |
| 27512 | U2 | DIP-28_W15.24mm_Socket |
| 74LS74 | U3 | DIP-14_W7.62mm_Socket |
| 74LS00 | U4 | DIP-14_W7.62mm_Socket |
This project is licensed under the terms of the MIT License. The original OpenC64Cart project does not currently name any licenses, so this could change in the future if an imcompatibility between licenses is identified. However, the current limitations of liability and warranty will always hold.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3 |
| 1 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | 27512 | Package_DIP:DIP-28_W15.24mm_Socket | U2 |
| 1 | 74LS00 | Package_DIP:DIP-14_W7.62mm_Socket | U4 |
| 1 | 74LS74 | Package_DIP:DIP-14_W7.62mm_Socket | U3 |
| 1 | C64-Exp-Port | OpenC64Cart:C64-Cart | U1 |
| 1 | PEG_HOLE | Connectors:1pin | J99 |
Nakazoto/CenturionComputer
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It measures 58.4 × 50.8 mm and has 2 copper layers, 1.6 mm thick.
8 parts, built around the 74LS00SC and 74LS74PC. 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.
From the jsanpe/ZaxCart repository on GitHub, at the commit this page was made from: the board is ZaxCart.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).