INES Mapper 246: Difference between revisions
From NESdev Wiki
Jump to navigationJump to search
m (interwiki for game background) |
NewRisingSun (talk | contribs) m ("Zhu Lu Zhi Zhan" is the subtitle of Huangdi, a different game. GoodNES still has them mixed up.) |
||
Line 1: | Line 1: | ||
[[Category:iNES Mappers|246]] | [[Category:iNES Mappers|246]] | ||
[[iNES Mapper 246]] seems to be a singleton for the Taiwanese game [[wikia:c:bootleggames:Feng_Shen_Bang|封神榜 ('' | [[iNES Mapper 246]] seems to be a singleton for the Taiwanese game [[wikia:c:bootleggames:Feng_Shen_Bang|封神榜 (''Fēngshénbǎng: Fúmó Sān Tàizǐ'')]]. | ||
It provides 2 KiB of RAM from $6800-$6FFF. | It provides 2 KiB of RAM from $6800-$6FFF. |
Revision as of 12:12, 2 April 2018
iNES Mapper 246 seems to be a singleton for the Taiwanese game 封神榜 (Fēngshénbǎng: Fúmó Sān Tàizǐ).
It provides 2 KiB of RAM from $6800-$6FFF.
Mask: $FFE7 $6000-6003: PRG Regs $6004-6007: CHR Regs CHR Setup: --------------------------- $0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00 +---------------+---------------+---------------+---------------+ | $6004 | $6005 | $6006 | $6007 | +---------------+---------------+---------------+---------------+ PRG Setup: --------------------------- $8000 $A000 $C000 $E000 +-------+-------+-------+-------+ | $6000 | $6001 | $6002 | $6003 | +-------+-------+-------+-------+ Powerup/Reset: --------------------------- $6003 set to $FF on cold boot. (All other registers probably also, but not required)
The present hardware seems to be:
- Four 74LS670 4 x 4bit dual-ported memory
- One GAL16V8
- PRG ROM (up to 2 MiB), CHR ROM (up to 512 KiB), PRG RAM (8 KiB)
- Miscellaneous resistors, diodes, and a battery to power the PRG RAM
There is additionally some weird behavior on reads from $FFE4-$FFFF:
- PRG ROM access when A15..A5 AND A2 are all HIGH should instead occur from a bank where PRG A17 is high, i.e. ( [$6003] | $10 )
However, the existing dumps in GoodNES have been pre-patched to not require this.
See also:
- http://forums.nesdev.org/viewtopic.php?t=13969 Why does Fong Shen Bang only work in Famiclones?