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Stefan ArentzandClaude Opus 4.8
3093ab224f
MousePaint hangs on the //e: it runs the //e's internal mouse firmware (INTCXROM=1), which drives the card as its real 6821 PIA ($C0n0-$C0n3), not the synthetic card's $Cn00 entry points. Diagnosed by booting the real disk headlessly (reaches the menu, RETURN ignored, the device touched twice). The synthetic firmware (plans/20260721-01) only covered the card's own entry points — the gap the "no committed MousePaint image" kickoff decision left. - notes/MOUSE.md: a "Known limitation" section recording the diagnosis and pointing at the new plan. - plans/20260721-03-mouse-pia-hardware.md: a six-phase plan to model the card as its real hardware — a 6821 PIA (reusing ewm/src/pia.rs, the Apple 1's) with the mouse mechanism (quadrature X/Y, button, IRQ lines) wired to its ports, so the //e internal firmware drives it. P1 reverse-engineers the wiring (the linchpin); P5 rewrites mouse_rom to drive the PIA for the ][+. Three kickoff decisions (][+ path, flagship gate, PR granularity). Docs only. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>