4 layers83.7 × 63.7 mm
Genesis phantasy star cart
jkfritcher/ps1_md_cart
Phantasy Star 1 Mega Drive cartridge PCB
14 parts1CERN-OHL-P-2.0
2 layers99.1 × 49.9 mm
Rc2014 nvram
jce/nvram_for_rc201464K NVRAM module for the RC2014
- Size
- 99.1 × 49.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 55
- Pads
- 153
- Tracks, vias
- 884, 62
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 8 Mar 2026
- Updated
- 3 Apr 2026
Overview
Rc2014 nvram is an open-source printed circuit board by jce, from the jce/nvram_for_rc2014 repository on GitHub, published under the BSD-3-Clause licence. It is a 2-layer board of 99.1 × 49.9 mm with 13 parts on 55 nets, routed with 884 tracks and 62 vias.
It is built around the BQ2201SN-N and 74HCT04D. Its parts include 6 ICs, 4 capacitors and 1 resistor.
Main components
2README
README.mdNVRAM module for the RC2014.
Pages the lower 32K out when the ROM module is present. Does not forget its content even when powered off. Therefore can be used as program storage in addition to remanent data.
Data and address traces are mostly connected in sequence. This means the ordering is slightly jumbled. But writing and reading back memory content makes the same transformations so this is functionally fine.
Errata for building pcb V 1.1 (actual, and in picture):
- Typo in ic name: 74HTC32 should be 74HCT32
- Resistor and capacitor value not in drawing / on silkscreen
- Hole in RC2014 standard is missing
- "Page" pin is on SPARE1, instead of the second pinheader row, which is absent.
Errata for building of the V 1.0 proto:
- 74LS32 should be 74HTC32
- RC2014bus pin1 is not indicated
- IC types are not on silkscreen
- Pull up resistor value is missing: 10K
- Partlist missing
- Ground issues. Bridge some ground planes if you want to use this proto!
- Top memory is the bottom ic, ic's are reversed.
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | C | Capacitor_THT:C_Rect_L4.6mm_W2.0mm_P2.50mm_MKS02_FKP02 | C1, C2, C3, C4 |
| 2 | BQ2201SN | _Library:SOIC127P600X175-8N | U3, U4 |
| 2 | CY62256-70PC | Package_DIP:DIP-28_W15.24mm | U1, U2 |
| 1 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 74HCT04 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U6 |
| 1 | 74HTC32 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U5 |
| 1 | Battery_Cell | _Library:ER14505 | BT1 |
| 1 | ~ | _Library:PinHeader_1x40_P2.54mm_Horizontal | Z80_BUS1 |
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Questions
How big is the Rc2014 nvram PCB?
It measures 99.1 × 49.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Rc2014 nvram use?
13 parts, built around the BQ2201SN-N and 74HCT04D. 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 Rc2014 nvram KiCad files?
From the jce/nvram_for_rc2014 repository on GitHub, at the commit this page was made from: the board is rc2014_nvram.kicad_pcb and its schematic rc2014_nvram.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Rc2014 nvram design in my own project?
Its repository publishes it under the BSD-3-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).