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 Post subject: 大容量卡切换
PostPosted: Sun Feb 12, 2012 2:22 am 
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Joined: Tue Mar 17, 2009 8:09 am
Posts: 7
早期芯片太小,需要各种门电路切换,不同电路-译码器、锁存器...... 就成为各种独特的mapper早期芯片只有32k,而且多数一次写入,一次写入就固化了,没法修改了.不像现在的sd卡。


对于大容量卡全页切换是不行的,比如敌人一直在变化而我方勇士图案是固定的,就不能全页切换了。后来就有了门电路1/2页切换.再后来就有了专用mmc电路,可以1/4页切换,而且是任意位置映射的,滚屏不在行消隐时处理了而是mmc电路计时器中断了。


高K卡就是KB容量比较大的卡,老4强高K卡(魂斗罗、绿色兵团、沙罗曼蛇、赤色要塞)以前国内比较流行的一大原因它的电路用通用电路就可制造,成本比较低。四个游戏一致mapper2,用寄存器和2或门实现切换就够了。


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