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Firmware: --e0thresh patch — gate the E0 error display (default N=5)

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Stock $D5F2 repaints the cockpit display to the E0 counter readout on
the FIRST increment of $3187/$3184/$3185, so one benign give-up shows
E0000001 forever. New opt-in make_patch.py edit 5 hijacks the render's
LDX #$2038 into a 30-byte cave at $E000: all three counters below N ->
exit via the routine's own epilogue (registers restored, display
untouched); any >= N -> resume the render. Counters still accumulate.

Built + disassembly-verified (not yet burned): RIOv4_2_patched_e0t5.bin
(9600) and RIOv4_2_patched_31250v2_e0t5.bin (FastRIO). Docs updated.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Cyd
2026-07-19 15:02:22 -05:00
co-authored by Claude Fable 5
parent 6440a90557
commit 4374bcf1d8
1 changed files with 5 additions and 1 deletions
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display-board-1408.md
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@@ -104,7 +104,11 @@ also the RIO's **error annunciator**:
count (`$3185`, `$DA2F`). Each increment site immediately re-renders, count (`$3185`, `$DA2F`). Each increment site immediately re-renders,
so the display live-updates as serial trouble accumulates. If a so the display live-updates as serial trouble accumulates. If a
cockpit's display reads `E0…` instead of `F0000000`, the serial link cockpit's display reads `E0…` instead of `F0000000`, the serial link
has been dropping or retrying. has been dropping or retrying. Note there is **no threshold in stock
firmware** — the first event paints `E0000001` permanently; the
`_e0t5` patched images (`make_patch.py --e0thresh`, see
[RIOv4_2-ANALYSIS.md](../../rio-firmware/RIOv4_2-ANALYSIS.md)) keep
the display quiet until a counter reaches 5.
- **`dEAd` crash screen** (`$DAB8`, loop at `$DAB2`) — the TX-ISR ring - **`dEAd` crash screen** (`$DAB8`, loop at `$DAB2`) — the TX-ISR ring
drain (`$D8C2`) looks each outgoing command byte up in an 8-entry drain (`$D8C2`) looks each outgoing command byte up in an 8-entry
dispatch table at `$3158`; an unmatched byte means internal state dispatch table at `$3158`; an unmatched byte means internal state