https://github.com/jonathspirit/gcm

G_CardMother a homemade without any microcontroller motherboard for 8bits processor like "GP8B"
https://github.com/jonathspirit/gcm

8bit 8bits cern-ohl computer cpu homemade kicad motherboard processor retrocomputing

Last synced: 4 months ago
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G_CardMother a homemade without any microcontroller motherboard for 8bits processor like "GP8B"

• Host: GitHub
• URL: https://github.com/jonathspirit/gcm
• Owner: JonathSpirit
• License: other
• Created: 2020-01-09T17:46:59.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2021-11-09T19:19:41.000Z (over 4 years ago)
• Last Synced: 2025-07-25T19:58:33.767Z (11 months ago)
• Topics: 8bit, 8bits, cern-ohl, computer, cpu, homemade, kicad, motherboard, processor, retrocomputing
• Homepage:
• Size: 25.4 MB
• Stars: 3
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG
  • Contributing: CONTRIBUTING.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

Awesome Lists containing this project

README

          
# GCM - GCardMother

Copyright (C) 2021 Guillaume Guillet\

Licensed under CERN-OHL-W v2 or later

This source describes Open Hardware and is licensed under the CERN-OHL-W v2 or later.

You may redistribute and modify this documentation and make products

using it under the terms of the CERN-OHL-W v2 (https:/cern.ch/cern-ohl).

This documentation is distributed WITHOUT ANY EXPRESS OR IMPLIED

WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY

AND FITNESS FOR A PARTICULAR PURPOSE. Please see the CERN-OHL-W v2

for applicable conditions.

Made with [Kicad](https://kicad.org/)

## Description

G_CardMother is a homemade without any microcontroller motherboard for 8bits processor compatible with the [MOM1_SPS1 standard](https://github.com/JonathSpirit/GComputer_standard) like [GP8B](https://github.com/JonathSpirit/GP8B)

 

 

## Stats

![version](https://img.shields.io/badge/version-GCM_5.1-blue)

![status](https://img.shields.io/badge/status-not_tested,_should_be_stable-yellow)

![bug](https://img.shields.io/github/issues/JonathSpirit/GCM/bug)\

![high_impact](https://img.shields.io/github/issues/JonathSpirit/GCM/high%20impact)\

![medium_impact](https://img.shields.io/github/issues/JonathSpirit/GCM/medium%20impact)\

![light_impact](https://img.shields.io/github/issues/JonathSpirit/GCM/light%20impact)

## Block diagram



## Main features

- Follow the [MOM1_SPS1](https://github.com/JonathSpirit/GComputer_standard) standard.

- A max frequency of 50Mhz divisible by multiples of two (up to a division of 65536).

  For the processor and a seperated line for peripherals.

- 4 [PP1](https://github.com/JonathSpirit/GComputer_standard) peripherals slot.

- 2 [MM1](https://github.com/JonathSpirit/GComputer_standard) memory slot with address extension.

- Code execution from the memory slot 1 and switchable with the memory slot 2.

- Redirection of the writing buses (can be used as buffer).

- Accessible debug pins.

## Motherboard standard

This motherboard, follow the [MOM1_SPS1](https://github.com/JonathSpirit/GComputer_standard) standard

## Compatibility

Should be compatible with all processor following the [SPS1](https://github.com/JonathSpirit/GComputer_standard) standard

| Processor     | Compatibility |

| ------------- | ------------- |

| [GP8B_V4.x](https://github.com/JonathSpirit/GP8B/tree/V4.0)  | ![none](https://img.shields.io/badge/-none-red)  |

| [GP8B_V5.0](https://github.com/JonathSpirit/GP8B/tree/V5.0)  | ![none](https://img.shields.io/badge/-none-red)  |

| [GP8B_V5.1+](https://github.com/JonathSpirit/GP8B/tree/V5.1)  | ![fully](https://img.shields.io/badge/-fully-green)  |

![compatibility_fully](https://img.shields.io/badge/compatibility-fully-green)

![compatibility_partially](https://img.shields.io/badge/compatibility-partially-yellow)

![compatibility_none](https://img.shields.io/badge/compatibility-none-red)

## Documents

[Block diagram (.pdf)](documents/blockDiagram/GCM_blockDiagram.pdf)

[Schematics (.pdf)](documents/GCM_schematics.pdf)

[Materials (.pdf)](documents/GCM_materials.pdf)

[Datasheet (.pdf)](documents/GCM_datasheet.pdf)

## Contributing / Questions

Please see [Contributing file](CONTRIBUTING.md)