, [# r5 ]. y1 i5 v4 f4 y- ^: n* A
只是我的猜测而已，另外这里引用nesdev网站的一段话：
4 |+ k0 `+ t* ?" ?( M“EXTx allows the combination of two PPUs - setting the "slave" bit in the PPUCTRL ($2000) register causes the PPU to output palette indices to these pins, and clearing said bit causes it to instead read indices from these pins (and use them to select the background color).9 ^' M- c2 a% Y% W. [- i: t' k
For the Vs. System and Playchoice PPUs, EXT0…2 are replaced with R, G, and B respectively. EXT3 is tied to ground; its functionality is unknown.”& }2 }2 @. A9 U( _# t/ q
$ B q. p3 V. t: Y大概意思是家用机版PPU的EXT0~3可以设置一个寄存器，使之在这些针脚输出调色板指数或者读取这些针脚的指数？？？（英文不好谁翻译一下）在街机基板版本里EXT0~2这三个脚被替换成了RGB，EXT3不知道是干嘛的 |
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发表于 2017-8-15 18:56:08
发表于 2017-8-17 20:43:53
和“NPB”有啥区别？
，稍后焊的时候是顺序对的7 I a9 E/ c) O/ o