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実機資料仮承認未処理2009-01-19 08:282011-02-20 05:19
 
テスターchowell担当者 ソース8080bw.cpp
バージョン0.129発生バージョン修正バージョン
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
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