2 layers116.8 × 30 mm
Type d
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
14 parts3kApache-2.0
2 layers55.8 × 64.7 mm
C264Cart
hackup/C264Cart8Cartridge for Commodore C16 and Plus/4 computers supporting 27C512, 27C020, and 27C040 EEPROMs.
- Size
- 55.8 × 64.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 54
- Pads
- 134
- Tracks, vias
- 418, 80
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 14 Nov 2023
- Updated
- 17 Dec 2023
Overview
C264Cart is an open-source printed circuit board by hackup, from the hackup/C264Cart repository on GitHub. It is a 2-layer board of 55.8 × 64.7 mm with 14 parts on 54 nets, routed with 418 tracks and 80 vias.
Its parts include 2 ICs, 2 diodes, 1 capacitor and 1 resistor. It belongs with the retro computing and games boards of this library.
README
README.mdC264Cart
The C264Cart ist a modernized ROM cartridge for the Commodore 264 family of 8-bit computers, the Commodore C16, C116, and Plus/4.
I started out by first reverse engineering and replicating the layout of an original ROM cartridge. Then I adapted it to better suit EPROMS and EEPROMS that are still readily available today, such as the W27C512 and W27C020. The layout was also scaled down to save shipping costs, but still fits the original cartridge shells.
See my blog post for more details.
I also created a simplified version of the original cartridge case for 3D printing that works well with the C264Cart. It is currently available for personal use on Thingiverse and Printables.
Configuration Options
There are two things that need to be configured, the type of EPROM to be used and the size of the targeted ROM images.
The C264Cart can be configured to support either 16k ROM images or 32k ROM images by setting JP6 and JP7 accordingly. 32k ROM images for the 264 computers usually consist of two 16k parts that were originally stored in two separate ROMs. On the C264Cart in 32k mode, both parts go into the same EPROM with the upper part directly following the lower one. As a result, A14 cannot be used for external bank switching in 32k mode. It is automatically selected by the cartridge.
If the C264Cart is configured for 16k mode R1, D1, and D2 don't need to be populated. These components are used in 32k mode, only.
The C264Cart supports 27C512, 27C020, and 27C040 (E)EPROMs. Make sure that these ICs are always aligned to the top of the cartridge as indicated on the silkscreen and that the jumpers JP4 and JP5 are set correctly!
27C512 for 4 ROM images with 16k each
| Address | A14 | A15 | |
|---|---|---|---|
| 0x0000 | ROM 1 | 0 | 0 |
| 0x4000 | ROM 2 | 1 | 0 |
| 0x8000 | ROM 3 | 0 | 1 |
| 0xC000 | ROM 4 | 1 | 1 |
27C020 for 16 ROM images with 16k each
| Address | A14 | A15 | A16 | A17 | |
|---|---|---|---|---|---|
| 0x00000 | ROM 1 | 0 | 0 | 0 | 0 |
| 0x04000 | ROM 2 | 1 | 0 | 0 | 0 |
| 0x08000 | ROM 3 | 0 | 1 | 0 | 0 |
| 0x0C000 | ROM 4 | 1 | 1 | 0 | 0 |
| 0x10000 | ROM 5 | 0 | 0 | 1 | 0 |
| ... | ... | ... | ... | ... | ... |
| 0x3C000 | ROM 16 | 1 | 1 | 1 | 1 |
27C040 for 32 ROM images with 16k each
| Address | A14 | A15 | A16 | A17 | A18 | |
|---|---|---|---|---|---|---|
| 0x00000 | ROM 1 | 0 | 0 | 0 | 0 | 0 |
| 0x04000 | ROM 2 | 1 | 0 | 0 | 0 | 0 |
| 0x08000 | ROM 3 | 0 | 1 | 0 | 0 | 0 |
| 0x0C000 | ROM 4 | 1 | 1 | 0 | 0 | 0 |
| 0x10000 | ROM 5 | 0 | 0 | 1 | 0 | 0 |
| ... | ... | ... | ... | ... | ... | ... |
| 0x7C000 | ROM 32 | 1 | 1 | 1 | 1 | 1 |
27C512 for 2 ROM images with 32k each
A14 must be left open!
| Address | A14 | A15 | |
|---|---|---|---|
| 0x0000 | ROM 1 low | x | 0 |
| 0x4000 | ROM 1 high | x | |
| 0x8000 | ROM 2 low | x | 1 |
| 0xC000 | ROM 2 high | x |
27C020 for 8 ROM images with 32k each
A14 must be left open!
| Address | A14 | A15 | A16 | A17 | |
|---|---|---|---|---|---|
| 0x00000 | ROM 1 low | x | 0 | 0 | 0 |
| 0x04000 | ROM 1 high | x | |||
| 0x08000 | ROM 2 low | x | 1 | 0 | 0 |
| 0x0C000 | ROM 2 high | x | |||
| ... | ... | x | ... | ... | ... |
| 0x38000 | ROM 8 low | x | 1 | 1 | 1 |
| 0x3C000 | ROM 8 high | x |
27C040 for 16 ROM images with 32k each
A14 must be left open!
| Address | A14 | A15 | A16 | A17 | A18 | |
|---|---|---|---|---|---|---|
| 0x00000 | ROM 1 low | x | 0 | 0 | 0 | 0 |
| 0x04000 | ROM 1 high | x | ||||
| 0x08000 | ROM 2 low | x | 1 | 0 | 0 | 0 |
| 0x0C000 | ROM 2 high | x | ||||
| ... | ... | x | ... | ... | ... | ... |
| 0x78000 | ROM 16 low | x | 1 | 1 | 1 | 1 |
| 0x7C000 | ROM 16 high | x |
Caption
License
USE AT YOUR OWN RISK!.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 16k/32k | C264Cart:Jumper3_Solder | JP6, JP7 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 1 | 100n | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C1 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 264-Exp-Port | hackup:C264-Cart-NoSilkS | U3 |
| 1 | 27C040 | C264Cart:DIP-28-32_W15.24mm | U1 |
| 1 | A14 | C264Cart:Jumper3_Solder | JP1 |
| 1 | A15 | C264Cart:Jumper3_Solder | JP2 |
| 1 | A16 | C264Cart:Jumper3_Solder | JP3 |
| 1 | A17 | C264Cart:Jumper3_Solder | JP4 |
| 1 | A18 | C264Cart:Jumper3_Solder | JP5 |
| 1 | LOGO | Logo:bigby2-cu | G*** |
Questions
How big is the C264Cart PCB?
It measures 55.8 × 64.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the C264Cart use?
14 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 C264Cart KiCad files?
From the hackup/C264Cart repository on GitHub, at the commit this page was made from: the board is C264Cart.kicad_pcb and its schematic C264Cart.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the C264Cart design in my own project?
Its repository states no licence, so its author keeps all rights: ask hackup before reusing the design.
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