mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 10:19:47 -04:00
Matthew Stanley
711d22cff3
The SIO model had a single global mc_state shared between both card slots, which caused 100% probe abort rate when the BIOS alternates between slot 0 and slot 1: each new 0x81 probe on the other slot would abort the in-flight state from the previous slot. Changes: - Per-slot McSlotState saved/restored on slot switch via mc_save_slot/mc_load_slot - 0x01 (pad select) preserves card state instead of aborting it - SIO_IRQ_DELAY split into PAD (4) and CARD (8) — card delay tuned so the SIO chain walker can dispatch func_00004D6C before next idle path tick clears the protocol counter Diagnostic tooling: - I_MASK[7] trace ring buffer with bit-7 set/clear counts and caller info - Counter (0x7514) field added to SIO trace so card protocol state machine progress is visible - check_card.py inspects card directory contents Runtime evidence: mc_aborts went from 100% → 0% (when slots don't overlap). mc_max_state advanced from 1 (only MC_CMD) to 8 (MC_READ_DATA). dispatch_check confirms _new_card AND its body 0x5688 are dispatched. Detection callback (func_00005D94 at BFC15894) verified to clear v0=0 before return — continue path of func_00004D6C IS being taken (133 I_MASK[7] sets observed). Remaining: 0x7550 stays NULL despite _new_card being dispatched. Either shell passes NULL buffer or early-return path of _new_card triggers. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
#!/usr/bin/env python3
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"""Dump I_MASK bit 7 trace from debug server."""
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import json, sys, socket, time
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def main():
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count = int(sys.argv[1]) if len(sys.argv) > 1 else 64
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.connect(('localhost', 4370))
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s.sendall(('{"cmd":"imask_trace","count":%d}\n' % count).encode())
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time.sleep(0.5)
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buf = b''
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while True:
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chunk = s.recv(65536)
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if not chunk:
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break
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buf += chunk
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try:
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data = json.loads(buf)
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break
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except json.JSONDecodeError:
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continue
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s.close()
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print('bit7_sets=%d bit7_clears=%d total_writes=%d' % (
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data['bit7_sets'], data['bit7_clears'], data['total']))
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print()
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for e in data['entries']:
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b7s = ' +SIO' if e['b7s'] else ''
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b7c = ' -SIO' if e['b7c'] else ''
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exc = 'EXC' if e['exc'] else ' '
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old_v = int(e['old'], 0) if isinstance(e['old'], str) else e['old']
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new_v = int(e['new'], 0) if isinstance(e['new'], str) else e['new']
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func_v = int(e['func'], 0) if isinstance(e['func'], str) else e['func']
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print('old=0x%03X new=0x%03X func=0x%08X w=%d %s%s%s' % (
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old_v, new_v, func_v, e['w'], exc, b7s, b7c))
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if __name__ == '__main__':
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main()
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