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thejayman77 ec82764bef Initial commit: retroDE_ps2 — first-of-its-kind PS2 GS FPGA core (DE25-Nano / Agilex 5)

RTL (GS rasterizer, EE core stub, platform bridge, LPDDR4B path), sim regression
(272 TBs), docs, and tooling. Copyrighted PS2 content (BIOS, game code, GS dumps,
and all dump-derived textures/traces) is excluded via .gitignore and stays local.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-29 20:10:50 -04:00

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Decision 0001: Project Posture

Status: Locked

Context

The project needed to choose between:

native full-system on current hardware,
staged subset on current hardware,
hybrid architecture,
future-hardware target.

This decision sets the planning posture for all early contracts and milestones.

Options considered

Native full-system on current hardware.
Staged subset on current hardware.
Hybrid architecture with significant host-side execution.
Future-hardware target.

Decision

Adopt staged subset on current hardware.

This means:

the project targets the current retroDE platform,
the architectural path remains that of a real PS2 core,
coverage will be incomplete for an extended period,
early phases prioritize observable bring-up over broad software compatibility.

The intended interpretation is:

real PS2 architectural path, incomplete coverage.

Consequences

Early milestones may validate only parts of the machine.
Some subsystems can remain stubbed or reduced while others become real.
The project preserves continuity with the rest of the retroDE family by staying on current hardware.
The project explicitly does not promise full-title compatibility on the current platform.
Contracts and milestones should optimize for progressive integration instead of "all-or-nothing" completeness.

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