{"id":23586548,"url":"https://github.com/doctorwkt/fisc","last_synced_at":"2025-10-19T03:18:35.908Z","repository":{"id":96057351,"uuid":"264331665","full_name":"DoctorWkt/FISC","owner":"DoctorWkt","description":"An 8-bit TTL CPU with a Stack Pointer","archived":false,"fork":false,"pushed_at":"2020-07-05T05:44:33.000Z","size":7324,"stargazers_count":6,"open_issues_count":0,"forks_count":1,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-05-07T07:48:51.257Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":"Perl","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"gpl-3.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/DoctorWkt.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2020-05-16T01:01:58.000Z","updated_at":"2024-12-21T05:16:34.000Z","dependencies_parsed_at":null,"dependency_job_id":"35f5e293-e089-4630-a2f0-9fc5e99d68a2","html_url":"https://github.com/DoctorWkt/FISC","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/DoctorWkt/FISC","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/DoctorWkt%2FFISC","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/DoctorWkt%2FFISC/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/DoctorWkt%2FFISC/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/DoctorWkt%2FFISC/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/DoctorWkt","download_url":"https://codeload.github.com/DoctorWkt/FISC/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/DoctorWkt%2FFISC/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":271364429,"owners_count":24746907,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","status":"online","status_checked_at":"2025-08-20T02:00:09.606Z","response_time":69,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"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":[],"created_at":"2024-12-27T04:11:33.608Z","updated_at":"2025-10-19T03:18:30.850Z","avatar_url":"https://github.com/DoctorWkt.png","language":"Perl","funding_links":[],"categories":[],"sub_categories":[],"readme":"# FISC: An 8-bit TTL CPU with a Stack Register\n\n**Please note**: The FISC design has some major flaws. Rather than\nfix them, I've incorporated the fixes into the next version of the\ndesign: ![FISC2](https://github.com/DoctorWkt/2FISC).\n\nFISC is an 8-bit microseqenced CPU wth a 64K address space built from\ndiscrete TTL-level components. It provides:\n\n + recursive **F**unctions,\n + **I**ndexed addressing and\n + **S**tack operations\n\nas well as the usual load/store and arithmetic operations, comparisons,\nbranches and jumps.\n\nThe design uses 25 chips and has 8K of ROM, 56K of RAM and a UART.\n\n![](Docs/Figs/pcb.jpg)\n\n## Documentation\n\nThe overall design of the CPU is covered in\n[Docs/arch_overview.md](Docs/arch_overview.md), and some details\nof the expected hardware implementation are in \n[Docs/fisc_implementation.md](Docs/fisc_implementation.md).\n\n## Implementation\n\nAt present, I have:\n\n + a Perl CPU simulator, [csim](csim)\n + an assembler, [cas](cas)\n + a simple compiler, [clc](clc)\n + example assembly and higher-level programs in [Examples](Examples)\n + a Verilog design in [Verilog](Verilog)\n + a schematic in [Kicad/schematic.pdf](Kicad/schematic.pdf)\n\n## Status of the CPU\n\n**mid-June, 2020**: I've ordered PCBs and they have arrived and I've soldered\non all the components. The CPU passes most of the tests but I have an issue\nwith addition that I am still working on.\n\nFor more detail on progress, you can read my [journal](Docs/journal.md).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdoctorwkt%2Ffisc","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdoctorwkt%2Ffisc","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdoctorwkt%2Ffisc/lists"}