mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Matthew Stanley
8b0fc34714
Real card protocol restarts on every fresh 0x81 — SELECT deassert is
a bus-wide reset signal. Earlier model preserved mc_state across
deassert via mc_save_slot, which caused every subsequent 0x81 to land
on a stale non-IDLE saved state and trigger abort_reselect bookkeeping.
Audit confirmed the BIOS-visible RX was still correct (the abort path
itself reset mc_state), but the retained sector/cmd/counter context
across logically-independent transactions was wrong per no$psx.
Clear volatile protocol state on SELECT deassert (state, cmd, sector,
sector_msb, sector_lsb, data_idx, checksum on both slots). Preserve
mc_slots[].flag (persistent "new card" metadata) and mc_slots[].data
(sector buffer, harmless to retain).
Result on a 4-press boot run: 6 transactions reach READ_DATA (ts=10)
and successfully read the "MC" header magic (RX bytes 0x4D 0x43);
remaining txns continue as 4-byte presence pings. Pre-fix: 0 reads
of card data ever; post-fix: card protocol can complete the setup
phase and enter data phase.
The byte-15 abort that follows is a separate blocker — kernel chain
dispatcher interleaves pad polling into the card data read. Tracked
for next session via the chain dispatcher disassembly.
Also includes:
- Slot-state capture in SioTraceEntry + sio_trace JSON emission
- dirty_ram_interp: replace mid-block fprintf+fflush with a counter
(CLAUDE.md §3 — synchronous Windows console I/O at high rate
starves the dispatch loop)
- Passive Python TCP probes (raw_tcp, trace_audit, trace_range,
txn_summary, txn_dist, txn_bytes, drs_filter, readram_test,
step_audit{,2}, verify_card_buffer, wtrace_filter)
- docs/MEMCARD_AUDIT_2026_04_28.md (prior session's 7-layer audit)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
19 lines
665 B
Python
19 lines
665 B
Python
"""Audit SIO byte trace: show per-byte mc_state, ctrl, slot states."""
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import sys, json, re
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txt = sys.stdin.read()
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m = re.search(r'\{.*\}', txt, re.S)
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if not m:
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print('parse fail'); sys.exit(1)
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j = json.loads(m.group(0))
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ents = j.get('entries', [])
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print('seq tx rx mc(pre>post) dev(pre>post) ctrl s0 s1 abrt ctr func')
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print('-' * 95)
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for e in ents:
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print(f"{e['seq']:>6} {e['tx']:>4} {e['rx']:>4} "
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f"{e['mc_pre']:>2} > {e['mc_post']:<2} "
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f"{e['dev_pre']:>2} > {e['dev_post']:<2} "
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f"{e['ctrl']:>6} {e['slot0']:>3} {e['slot1']:>3} {e['abort']:>5} {e['ctr']:>4} "
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f"{e['func']}")
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