Exploring Microcode CPU Instructions with RISC 8-Bit Breadboard Computer

Ayushman Bhattacharya; Anwesha Chakraborty; Vivek Yadav; Piyali Sarkar; Sonali Bhowmik; Dipankar Misra; Sumit Nandi

OctaBit · not reviewed

Exploring Microcode CPU Instructions with RISC 8-Bit Breadboard Computer

By Ayushman Bhattacharya, Anwesha Chakraborty, Vivek Yadav, Piyali Sarkar, Sonali Bhowmik, Dipankar Misra, Sumit Nandi

A documented RISC-style 8-bit breadboard computer built with transistor and TTL logic, a discrete arithmetic logic unit, Arduino-managed microcode, four-bit opcode and address fields, and a four-digit seven-segment output. The public record connects the implementation, schematics, hardware documentation, and published paper.

Research status: released
Lifecycle: active
Relationship: Elixpo-originated
Registry state: verified
Reproducibility: partial
Repository license: MIT
Released: 2025-06-01
Publication: International Journal of Enhanced Research in Science, Technology & Engineering · 14(6)

Research context

Scope and public claim

OctaBit is an open computer-architecture project built from discrete logic, breadboards, EEPROM microcode, and Arduino control tooling. Its record connects the MIT-licensed source, schematics and hardware documentation to the published June 2025 paper.

Elixpo-originated. Created or operated as part of Elixpo. Copyright and artifact licences still remain repository-specific.

Authors and affiliations

Ayushman Bhattacharya · Department of Computer Science and Engineering, JIS University

Anwesha Chakraborty · Department of Computer Science and Engineering, JIS University

Vivek Yadav · Department of Computer Science and Engineering, JIS University

Piyali Sarkar · Department of Computer Science and Engineering, JIS University

Sonali Bhowmik · Department of Computer Science and Engineering, JIS University

Dipankar Misra · Department of Computer Science and Engineering, JIS University

Sumit Nandi · Harishchandrapur College, Malda

Reproducibility

partial

The repository publishes implementation code, component documentation, schematics, and EEPROM tooling, but Elixpo has not independently reproduced the complete paper-specific hardware build.

Review statement

not reviewed

Elixpo reports the review state explicitly and does not imply external peer review where none is recorded.

Licensing

source code and repository hardware material
MIT

published paper
No reuse license stated in the supplied paper

Repository-level evidence
GitHub currently detects an MIT repository license. The separately published paper retains its own stated publication terms.

Open controlling license

License checked 2026-10-17 · registry status checked 2026-10-16

Citation

Bhattacharya, Chakraborty, Yadav, Sarkar, Bhowmik, Misra, and Nandi. Exploring Microcode CPU Instructions with RISC 8-Bit Breadboard Computer. International Journal of Enhanced Research in Science, Technology & Engineering 14(6), 212–226 (2025).

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