mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -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>
27 lines
792 B
Python
27 lines
792 B
Python
#!/usr/bin/env python3
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"""Check memory card file contents."""
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import sys
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def main():
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for fname in ['card1.mcd', 'card2.mcd']:
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try:
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data = open(fname, 'rb').read()
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except FileNotFoundError:
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print('%s: NOT FOUND' % fname)
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continue
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print('%s: %d bytes, header=%s' % (fname, len(data), data[0:2]))
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for i in range(1, 16):
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off = i * 128
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status = data[off]
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name_bytes = data[off+10:off+10+20]
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name = name_bytes.split(b'\x00')[0].decode('ascii', 'replace')
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if status != 0xA0:
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print(' Slot %2d: status=0x%02X name=%s (USED)' % (i, status, name))
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else:
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print(' Slot %2d: FREE' % i)
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if __name__ == '__main__':
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main()
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