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実機資料解決済み修正済み2009-01-28 12:432011-05-22 15:56
 
テスターchowell担当者hapソースsafarir.cpp
バージョン0.129u2発生バージョン修正バージョン0.141u3
フラグバグかもね
セット safarir
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概 要3MHzのCPU速度は多分高すぎ。8080Aの通常動作速度は2.0833MHz。
詳 細The safarir.c driver includes the CPU specification:

	MDRV_CPU_ADD("main", 8080, 3072000)	/* 3 MHz ? */


The pcbinfo file for this game notes that the cpu is an 8080 and that the main crystal is 18 MHz, but it says nothing about the CPU clock speed.

The standard 8080A could only run at 2 MHz (actually, 2.0833 MHz). The only 8080A version which was rated for 3 MHz (actually, 3.125 MHz) was the 8080A-1. It is possible that Safari Rally used this version, but this would make it the only 8080-based game in MAME to require one; all others ran the CPU at about 2 MHz or lower. Since the 3 MHz CPU clock has not been confirmed, it seems much more likely that the assumed CPU clock divisor is wrong.

Another possibility is that the system used an 8085, since the standard version of that chip was rated at 3 MHz, but this would mean the CPU was misidentified in the pcbinfo file.
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