| カテゴリ | 重要度 | ステータス | 解決状況 | 登録日時 | 最終更新 |
|---|---|---|---|---|---|
 実機資料 | 低 | 仮承認 | 未処理 | 2009-01-19 08:28 | 2011-02-20 05:19 |
| テスター | chowell | 担当者 | ソース | midw8080/8080bw.cpp | |
| バージョン | 0.129 | 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 | バグかもね | ||||
| セット | sflush | ||||
| セット詳細 |
 sflush - ストレートフラッシュ | ||||
| 概 要 | pcbinfoファイルによると、CPUのクロックが高すぎるかも。 | ||||
| 詳 細 | The MACHINE_DRIVER entry for sflush specifies the CPU as:
MDRV_CPU_REPLACE("main",M6800,2000000) /* ?? */
indicating a Motorola 6800 running at 2 MHz. However, the MAWS pcbinfo file for sflush: http://www.mameworld.net/maws/pcbinfo/Sflush.txt which describes the PCB from which the ROMs were dumped, says: Taito original board set with Motorola 68A00 CPU. The Motorola 68A00 was only rated for 1.5 MHz maximum. 2 MHz speed would require a 68B00. Unfortunately I have no board or schematic to double-check the processor clock. Keep in mind that the 6800 used a different clocking scheme from the 8080, so their clock speeds are not equivalent. A memory access on the 6800 took only 1 clock cycle, while it took 3 clock cycles on the 8080. Since 8-bit microprocessors were mostly limited by memory access, even a 1 MHz 6800 should provide at least as much processing power as a 2 MHz 8080. I suppose the following MAME bugs may be related to this clock speed issue: http://mametesters.org/view.php?id=1603 http://mametesters.org/view.php?id=821 | ||||
| 再現手順 | |||||
| 追加情報 | |||||
| 添付ファイル | |||||