{"id":24013280,"url":"https://github.com/jonathspirit/gcm","last_synced_at":"2026-02-07T14:34:31.368Z","repository":{"id":56066379,"uuid":"232869463","full_name":"JonathSpirit/GCM","owner":"JonathSpirit","description":"G_CardMother a homemade without any microcontroller motherboard for 8bits processor like \"GP8B\"","archived":false,"fork":false,"pushed_at":"2021-11-09T19:19:41.000Z","size":26611,"stargazers_count":3,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"master","last_synced_at":"2025-07-25T19:58:33.767Z","etag":null,"topics":["8bit","8bits","cern-ohl","computer","cpu","homemade","kicad","motherboard","processor","retrocomputing"],"latest_commit_sha":null,"homepage":"","language":null,"has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"other","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/JonathSpirit.png","metadata":{"files":{"readme":"README.md","changelog":"CHANGELOG","contributing":"CONTRIBUTING.md","funding":".github/FUNDING.yml","license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null},"funding":{"github":"JonathSpirit"}},"created_at":"2020-01-09T17:46:59.000Z","updated_at":"2023-09-21T11:50:32.000Z","dependencies_parsed_at":"2022-08-15T12:31:08.607Z","dependency_job_id":null,"html_url":"https://github.com/JonathSpirit/GCM","commit_stats":null,"previous_names":[],"tags_count":3,"template":false,"template_full_name":null,"purl":"pkg:github/JonathSpirit/GCM","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/JonathSpirit%2FGCM","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/JonathSpirit%2FGCM/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/JonathSpirit%2FGCM/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/JonathSpirit%2FGCM/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/JonathSpirit","download_url":"https://codeload.github.com/JonathSpirit/GCM/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/JonathSpirit%2FGCM/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":29197022,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-02-07T12:38:28.597Z","status":"ssl_error","status_checked_at":"2026-02-07T12:38:23.888Z","response_time":63,"last_error":"SSL_read: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["8bit","8bits","cern-ohl","computer","cpu","homemade","kicad","motherboard","processor","retrocomputing"],"created_at":"2025-01-08T06:51:51.776Z","updated_at":"2026-02-07T14:34:31.340Z","avatar_url":"https://github.com/JonathSpirit.png","language":null,"funding_links":["https://github.com/sponsors/JonathSpirit"],"categories":[],"sub_categories":[],"readme":"# GCM - GCardMother\n\nCopyright (C) 2021 Guillaume Guillet\\\nLicensed under CERN-OHL-W v2 or later\n\n\u003ctable border=\"0px\"\u003e\n\u003ctr\u003e\n\u003ctd\u003e\nThis source describes Open Hardware and is licensed under the CERN-OHL-W v2 or later.\n\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\nYou may redistribute and modify this documentation and make products\nusing it under the terms of the CERN-OHL-W v2 (https:/cern.ch/cern-ohl).\nThis documentation is distributed WITHOUT ANY EXPRESS OR IMPLIED\nWARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY\nAND FITNESS FOR A PARTICULAR PURPOSE. Please see the CERN-OHL-W v2\nfor applicable conditions.\n\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/table\u003e\n\nMade with [Kicad](https://kicad.org/)\n\n## Description\nG_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)\n\n\u003cimg src=\"images/GCM.JPG\" alt=\"GCM_image\" width=\"400\"/\u003e \u003cimg src=\"images/GCM_3D.png\" alt=\"GCM_3D_image\" width=\"400\"/\u003e\n\u003cimg src=\"images/GCM_3D_TOP.png\" alt=\"GCM_3D_TOP_image\" width=\"400\"/\u003e \u003cimg src=\"images/GCM_3D_BOT.png\" alt=\"GCM_3D_BOT_image\" width=\"400\"/\u003e\n\n## Stats\n\n![version](https://img.shields.io/badge/version-GCM_5.1-blue)\n\n![status](https://img.shields.io/badge/status-not_tested,_should_be_stable-yellow)\n\n![bug](https://img.shields.io/github/issues/JonathSpirit/GCM/bug)\\\n![high_impact](https://img.shields.io/github/issues/JonathSpirit/GCM/high%20impact)\\\n![medium_impact](https://img.shields.io/github/issues/JonathSpirit/GCM/medium%20impact)\\\n![light_impact](https://img.shields.io/github/issues/JonathSpirit/GCM/light%20impact)\n\n## Block diagram\n\n\u003cimg src=\"images/diagram.png\" alt=\"Image of diagram\" width=\"600\"/\u003e\n\n## Main features\n\n- Follow the [MOM1_SPS1](https://github.com/JonathSpirit/GComputer_standard) standard.\n\n- A max frequency of 50Mhz divisible by multiples of two (up to a division of 65536).\n  For the processor and a seperated line for peripherals.\n\n- 4 [PP1](https://github.com/JonathSpirit/GComputer_standard) peripherals slot.\n\n- 2 [MM1](https://github.com/JonathSpirit/GComputer_standard) memory slot with address extension.\n\n- Code execution from the memory slot 1 and switchable with the memory slot 2.\n\n- Redirection of the writing buses (can be used as buffer).\n\n- Accessible debug pins.\n\n\n## Motherboard standard\nThis motherboard, follow the [MOM1_SPS1](https://github.com/JonathSpirit/GComputer_standard) standard\n\n## Compatibility\nShould be compatible with all processor following the [SPS1](https://github.com/JonathSpirit/GComputer_standard) standard\n\n| Processor     | Compatibility |\n| ------------- | ------------- |\n| [GP8B_V4.x](https://github.com/JonathSpirit/GP8B/tree/V4.0)  | ![none](https://img.shields.io/badge/-none-red)  |\n| [GP8B_V5.0](https://github.com/JonathSpirit/GP8B/tree/V5.0)  | ![none](https://img.shields.io/badge/-none-red)  |\n| [GP8B_V5.1+](https://github.com/JonathSpirit/GP8B/tree/V5.1)  | ![fully](https://img.shields.io/badge/-fully-green)  |\n\n![compatibility_fully](https://img.shields.io/badge/compatibility-fully-green)\n![compatibility_partially](https://img.shields.io/badge/compatibility-partially-yellow)\n![compatibility_none](https://img.shields.io/badge/compatibility-none-red)\n\n## Documents\n[Block diagram (.pdf)](documents/blockDiagram/GCM_blockDiagram.pdf)\n\n[Schematics (.pdf)](documents/GCM_schematics.pdf)\n\n[Materials (.pdf)](documents/GCM_materials.pdf)\n\n[Datasheet (.pdf)](documents/GCM_datasheet.pdf)\n\n## Contributing / Questions\nPlease see [Contributing file](CONTRIBUTING.md)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjonathspirit%2Fgcm","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjonathspirit%2Fgcm","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjonathspirit%2Fgcm/lists"}