4 layers243.8 × 171.5 mm
2 layers57.4 × 38.6 mm
Raspberry PI eeprom writer code
- Size
- 57.4 × 38.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 7
- Nets
- 42
- Pads
- 96
- Tracks, vias
- 267, 5
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 8 Nov 2021
- Updated
- 16 Nov 2021
Overview
SPI 28c256 is an open-source printed circuit board by homebrew8088, from the homebrew8088/Raspberry-Pi-32k-EEPROM-Programmer repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 57.4 × 38.6 mm with 7 parts on 42 nets, routed with 267 tracks and 5 vias.
It is built around the MCP23S17-E/SO. Its parts include 3 resistors, 3 ICs and 1 connector.
Main components
1README
README.mdRaspberry-Pi-32k-EEPROM-Programmer
This is a repository for my Rapberry Pi 32k EEPROM Programmer.
The code is written in python. To run it from the command line type "python3 32k.py"
I have included my Kicad Files where you can find the schematics and PCB layout.
https://www.homebrew8088.com/home/28c256-eeprom-writer
This was developed to be a cheap alternative for writing 32k EEPROMs for my 8088 projects. You can compile and upload code in the application or just upload a precompiled file. When using the application to compile the JMP code for an 8088 is automatically inserted at address 0x7FF0.
The project uses
1 - Raspberry PI
2 - MCP23S17 SPI I/O’s
1 - 28 pin ZIF
1 - PCB
3 - 10k resistors
Trouble shoot
-make sure SPI is enabled on the raspberry pi
-install nasm on the raspberry pi
Parts
7| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10k ohm | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3 |
| 2 | MCP23S17 | Package_DIP:DIP-28_W7.62mm | U0, U1 |
| 1 | 28C256 | Socket:DIP_Socket-28_W11.9_W12.7_W15.24_W17.78_W18.5_3M_228-1277-00-0602J | U2 |
| 1 | Pinheader | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
Questions
How big is the SPI 28c256 PCB?
It measures 57.4 × 38.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SPI 28c256 use?
7 parts, built around the MCP23S17-E/SO. 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 SPI 28c256 KiCad files?
From the homebrew8088/Raspberry-Pi-32k-EEPROM-Programmer repository on GitHub, at the commit this page was made from: the board is Kicad/SPI 28c256.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the SPI 28c256 design in my own project?
Its repository publishes it under the GPL-3.0 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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