Talk:INES Mapper 027: Difference between revisions
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VRC4 actually supports 9 pin wide CHR banking, making this look awfully like the VRC4"f" (mapper 23) variant... other than whatever weirdness is going on with the definition of $9002. (Is this 3x8+8F PRG banking or MMC3 style PRG banking?) ... and whether the scanline irq behavior is A12-based or M2-based —[[User:Lidnariq|Lidnariq]] ([[User talk:Lidnariq|talk]]) 20:39, 2 March 2013 (MST) | VRC4 actually supports 9 pin wide CHR banking, making this look awfully like the VRC4"f" (mapper 23) variant... other than whatever weirdness is going on with the definition of $9002. (Is this 3x8+8F PRG banking or MMC3 style PRG banking?) ... and whether the scanline irq behavior is A12-based or M2-based —[[User:Lidnariq|Lidnariq]] ([[User talk:Lidnariq|talk]]) 20:39, 2 March 2013 (MST) | ||
:The scanline IRQ must be M2-based: the game was re-released in a later version that includes an NTSC/PAL selection screen at the beginning. This would not be necessary if the counter were PA12-based | :The scanline IRQ must be M2-based: the game was re-released in a later version that includes an NTSC/PAL selection screen at the beginning. This would not be necessary if the counter were PA12-based. I do not understand the question about the $9002 register; it seems just like the VRC4's PRG Swap Mode functionality. All in all, it seems to be bog-standard VRC4f to me, and runs perfectly when emulated as such. I propose following FCEUX in using INES Mapper 027 solely for ''迷魂車 (Míhúnchē)'' (CC-27) and using Mapper 23.1 for ''World Hero''. [[User:NewRisingSun|NewRisingSun]] ([[User talk:NewRisingSun|talk]]) 10:58, 24 May 2019 (MDT) | ||
:After re-reading the description a number of times, I now understand what is meant by "3x8+8F vs MMC3-style PRG banking" --- basically, a VRC4 equivalent of [[INES Mapper 100]]. [[User:NewRisingSun|NewRisingSun]] ([[User talk:NewRisingSun|talk]]) 11:15, 24 May 2019 (MDT) | |||
::Also, whatever led Nestopia to put a copy of the $9002 "geometry" register at $9080?—[[User:Lidnariq|Lidnariq]] ([[User talk:Lidnariq|talk]]) 05:34, 25 May 2019 (MDT) | |||
Latest revision as of 11:34, 25 May 2019
VRC4 actually supports 9 pin wide CHR banking, making this look awfully like the VRC4"f" (mapper 23) variant... other than whatever weirdness is going on with the definition of $9002. (Is this 3x8+8F PRG banking or MMC3 style PRG banking?) ... and whether the scanline irq behavior is A12-based or M2-based —Lidnariq (talk) 20:39, 2 March 2013 (MST)
- The scanline IRQ must be M2-based: the game was re-released in a later version that includes an NTSC/PAL selection screen at the beginning. This would not be necessary if the counter were PA12-based. I do not understand the question about the $9002 register; it seems just like the VRC4's PRG Swap Mode functionality. All in all, it seems to be bog-standard VRC4f to me, and runs perfectly when emulated as such. I propose following FCEUX in using INES Mapper 027 solely for 迷魂車 (Míhúnchē) (CC-27) and using Mapper 23.1 for World Hero. NewRisingSun (talk) 10:58, 24 May 2019 (MDT)
- After re-reading the description a number of times, I now understand what is meant by "3x8+8F vs MMC3-style PRG banking" --- basically, a VRC4 equivalent of INES Mapper 100. NewRisingSun (talk) 11:15, 24 May 2019 (MDT)
