|
|
| (17 intermediate revisions by 3 users not shown) |
| Line 1: |
Line 1: |
| [[Category:iNES Mappers|185]][[Category:in NesCartDB|185]][[Category:Discrete logic mappers|185]] | | #REDIRECT [[CNROM]] |
| '''iNES Mapper 185''' is used for games that use the [[CNROM]] board with weak copy protection measures.
| | {{DEFAULTSORT:185}}[[Category:iNES Mappers]][[Category:in NesCartDB]][[Category:Discrete logic mappers]][[Category:Nintendo licensed mappers]][[Category:NES 2.0 mappers with submappers]] |
| | |
| Example Games:
| |
| * ''Spy Vs. Spy (J)''
| |
| * ''Mighty Bomb Jack (J)''
| |
| | |
| ==Overview==
| |
| * PRG ROM size: 16 KiB or 32 KiB
| |
| * PRG ROM bank size: Not bankswitched
| |
| * PRG RAM: None
| |
| * CHR capacity: 8 KiB ROM (copy protected)
| |
| * Nametable [[mirroring]]: Solder pads select vertical or horizontal mirroring
| |
| * Subject to [[bus conflict]]s: Yes [[Category:Mappers with bus conflicts]]
| |
| | |
| ==Banks==
| |
| * PPU $0000-$1FFF: 8 KB switchable CHR ROM bank
| |
| | |
| ==Registers==
| |
| === Bank select ($8000-$FFFF) ===
| |
| 7 bit 0
| |
| ---- ----
| |
| ..CC ..CC
| |
| || ||
| |
| ++---++- Used for CHR copy protection.
| |
| | |
| These games only have 8k of CHR, and they attempt to disable CHR by writing
| |
| a specific value to the CHR Reg, then VERIFY that garbage is read back, then they swap back to the
| |
| actual CHR. If they don't get the expected garbage, they lock up.
| |
|
| |
| Perhaps this was some sort of copy protection?
| |
| | |
| Each game has their own value that enables/disables CHR. Rather than failing to attempt to list all the
| |
| exact values used here (I don't know what all of them are), I can provide some logic:
| |
|
| |
| if C AND $0F is nonzero, and if C does not equal $13: CHR is enabled
| |
| otherwise CHR is disabled
| |
|
| |
| When CHR is disabled, the pattern tables are open bus. Theoretically, this should
| |
| return the LSB of the address read, but real-world behavior may vary.
| |
| | |
| | |
| This table has been assembled from nocash and the sources of MESS, Nestopia, and FCEUX.
| |
| {| class="datatable"
| |
| ! !! colspan=2|if this value is written
| |
| |-
| |
| ! Game !! Must work !! Mustn't work <!-- possible submapper number -->
| |
| |-
| |
| | [http://bootgod.dyndns.org:7777/profile.php?id=1262 Bird Week] || 0x0F || 0xF0 <!-- 3 -->
| |
| |-
| |
| | [http://bootgod.dyndns.org:7777/profile.php?id=1264 B-Wings] || 0x33 || 0x00 <!-- F -->
| |
| |-
| |
| | [http://bootgod.dyndns.org:7777/profile.php?id=1261 Mighty Bomb Jack] || 0x11 || 0x00 <!-- 5 -->
| |
| |-
| |
| | Sansuu 1 Nen, [http://bootgod.dyndns.org:7777/profile.php?id=1263 Sansuu 2 Nen], and [http://bootgod.dyndns.org:7777/profile.php?id=4061 Othello] || 0x22 || 0x20 <!-- A -->
| |
| |-
| |
| | [http://bootgod.dyndns.org:7777/profile.php?id=3791 Sansuu 3 Nen] || 0xFF || 0x00 <!-- F -->
| |
| |-
| |
| | [http://bootgod.dyndns.org:7777/profile.php?id=3592 Spy vs Spy] || 0x21 || 0x13 <!-- 9 -->
| |
| |-
| |
| | [http://bootgod.dyndns.org:7777/profile.php?id=2332 Seicross (v2)] || 0x20 || 0x21 <!-- 8 -->
| |
| |}
| |
| | |
| ==References==
| |
| * [http://www.romhacking.net/documents/362/ Disch's Mapper Notes]
| |
