| カテゴリ | 重要度 | ステータス | 解決状況 | 登録日時 | 最終更新 |
|---|---|---|---|---|---|
| 最小 | 指示待ち | 未処理 | 2026-08-27 04:45 | 2026-08-29 00:33 | |
| テスター | Marcher | 担当者 | ソース | ||
| バージョン | 0.288 | 発生バージョン | 修正バージョン | ||
| 修正コミット | プルリク | ||||
| フラグ | ソース内の記述 | ||||
| セット | |||||
| セット詳細 | |||||
| 概 要 | null_modem.cppで、DCD/DSR/CTSが0にハードコードされている。 | ||||
| 詳 細 | Running mac128k and attempting to dial through MacTerminal's Dial dialog (Connection Type = Modem, with tcpser acting as a real modem emulator) consistently reports "no modem found", even when the rest of the path is confirmed working (manually typed "AT"/"ATDT777" gets through cleanly and tcpser replies "OK"/dials out correctly). The cause was found in source, src/devices/bus/rs232/null_modem.cpp, function update_serial(): // TODO: make this configurable output_dcd(0); output_dsr(0); output_cts(0); This is the only place in the entire file where DCD/DSR/CTS are set — they are unconditionally forced to 0 on every device reset and on every speed/parity/data-bits change, regardless of anything arriving over bitb (bitbanger). The only other BITBANGER-capable device in the same directory, rs232_sync_io.cpp, was also checked and shows the same pattern (output_dcd(0); output_dsr(0); hardcoded). In other words, MAME 0.288 has no rs232 device at all that combines socket connectivity (bitbanger) with real DSR/CTS signaling. The guest OS (here, MacTerminal's modem-detection routine) apparently checks exactly these lines before allowing a dial attempt — and since they can never go high, any software relying on hardware modem-presence detection via DSR/CTS is guaranteed to see "no modem", regardless of tcpser settings, bitbanger, or any intermediate tooling. | ||||
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| 添付ファイル | |||||