Thriving Thriving C++ C+ C C
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xpeccy-plus dotkoval/xpeccy-plus

ZX Spectrum all-rounder: run-ahead for low-latency play, accurate ULA timing for demos, a proper Z80 debugger for development.

HEALTH 90 / Healthy
// solo builder// funded// release machine
01-2024 · today · dotkoval
★15 Share View on GitHub ↗

// readme

Xpeccy+

A ZX Spectrum emulator with a built-in debugger.

Xpeccy+ is a fork of Xpeccy by SAM style. All the emulation code comes from that project. This fork does not claim authorship of it.

Current version: 2026.7. Forked from upstream build 20260807.

Windows, Linux and macOS are built by CI on every nightly and off every release tag. The macOS build is arm64 only and carries no developer signature, so a downloaded DMG has to be allowed through Gatekeeper by hand.

Why a fork

Upstream Xpeccy is a multi-platform emulator: ZX Spectrum and clones, plus MSX, Game Boy, NES, Commodore 64, BK0010, IBM PC and more. Its focus is to support more machines.

This fork narrows the focus to the ZX Spectrum, and spends the effort on the parts a user touches every day. That is a different plan for the same code, so it is easier to follow it in a separate project than to steer one project in two directions.

Xpeccy+ is also open to other people’s work. The aim is a good ZX emulator built together, so patches, ideas and bug reports are welcome.

Goals

  • ZX Spectrum only. Since 2026.4 the other machines are not built, and since 2026.5…
↑ The Undervalued Score +

How much a project earns versus how much attention it actually gets. Above 50 means the work is outrunning its audience. Recomputed nightly from commit velocity, contributor effort, issue resolution, fork utility, release cadence, and project maturity — divided by a logarithmic reach factor.

score  = signal / reach

signal = 0.25·commit_velocity   // commits in last 90 days (cap 30)
       + 0.20·contributor_work  // unique authors × velocity (cap 100)
       + 0.20·issue_resolution  // closed ÷ total issues
       + 0.20·fork_ratio        // forks ÷ stars (proxy for real usage)
       + 0.10·release_cadence   // releases in 90 days (cap 3)
       + age_bonus              // +0 to +0.30 after 6 months
       + homepage_bonus         // +0.05 if homepage is set

reach  = log₁₀(stars + watchers + 10)█
♥ The Health Score +

Is the project alive and maintained right now? A 0–100 pulse recomputed nightly from commit recency, rhythm, how fast issues close, and how quickly PRs get merged.

health = 0.35·recency       // days since last commit (90d decay)
       + 0.25·cadence       // commit rhythm consistency
       + 0.20·issue_health  // closed ÷ total issues
       + 0.20·pr_health     // merged ÷ total PRs█
◷ Health bands +

The colour and label on every card come straight from the health score.

Healthy   80 – 100   active, responsive, regular releases
Stable    60 – 79    maintained, steady, no alarms
Quiet     40 – 59    slowing down — watch this one
At Risk    0 – 39    going dark · candidate for rescue█
// Tags — what each label means +

Tags are independent behavioral signals computed nightly. A project can hold multiple at once. They drive the home page sections.

solo_builder      one person holds > 80% of commits (last 180d)
needs_contributors has open "help wanted" or "good first issue" labels
hidden_gem        < 100 stars · active in last 3 months · documented
legacy_hero       repo > 5 years old · committed this year
fork_magnet       forks/stars > 0.5 · used as template or dependency
release_machine   5+ releases in the last 90 days
under_pressure    > 10 open issues · ≤ 2 contributors · health ≥ 60
community_watch   watchers > stars · devs tracking before the public
community_hub     GitHub Discussions enabled · > 20 discussions
funded            maintainer has active funding channel█
★ Why rank against stars at all? +

Stars are an outcome, not effort. A project with 8 stars and daily commits is doing more interesting work than one coasting on 8k. We measure the building, then divide by the attention already received — so the genuinely undervalued rise to the top.

// stars   = lagging indicator
// commits = leading indicator
// we rank by the leading one█