NES 2.0 Mapper 525: Difference between revisions
From NESdev Wiki
Jump to navigationJump to search
NewRisingSun (talk | contribs) (Created page with "NES 2.0 Mapper 525 is used for the Kaiser bootleg versions of ''Contra'' and 月風魔伝 (Getsu Fūma Den). It's a VRC2 clone (with chip A0=CPU A0 chip A1=CPU A1, i.e. VR...") |
(pretty certain these PCBs never contained a VRC2; if they had, there would have been no point in reimplementing the CHR bankswitching) |
||
| (2 intermediate revisions by 2 users not shown) | |||
| Line 1: | Line 1: | ||
NES 2.0 Mapper 525 is used for | {{DEFAULTSORT:525}}[[Category:Discrete logic mappers]] | ||
NES 2.0 Mapper 525 is used for mapper hacks of VRC2-using games. Specific known games include Kaiser bootleg versions of ''Contra'' and 月風魔伝 (Getsu Fūma Den). Its UNIF board name is '''UNL-KS7021A'''. | |||
== | == Registers == | ||
Mask: | Mask: $F000 | ||
$8000: [.... PPP.] - Select 16KiB PRG bank at $8000-$BFFF | |||
$9000: [.... ...M] - like VRC2, 0: Vertical Mirroring (PPU A10); 1: Horizontal Mirroring (PPU A11) | |||
Mask: $F007 | |||
* $B000: Select 1 KiB CHR-ROM bank at PPU $0000-$03FF | * $B000: Select 1 KiB CHR-ROM bank at PPU $0000-$03FF | ||
* $B001: Select 1 KiB CHR-ROM bank at PPU $0400-$07FF | * $B001: Select 1 KiB CHR-ROM bank at PPU $0400-$07FF | ||
| Line 12: | Line 17: | ||
* $B007: Select 1 KiB CHR-ROM bank at PPU $1C00-$1FFF | * $B007: Select 1 KiB CHR-ROM bank at PPU $1C00-$1FFF | ||
== | == Hardware == | ||
The 7021A PCB contains a [[7400]], a [[7427]], a [[7432]], a [[7474]], a [[74139]], a [[74157]], a [[74174]], two [[74189]]s, and the two ROMs. | |||
==Notes== | |||
* Getsu Fūma Den PCB images and analysis: [//forums.nesdev.org/viewtopic.php?t=21091 BBS] | |||
Latest revision as of 21:42, 25 October 2020
NES 2.0 Mapper 525 is used for mapper hacks of VRC2-using games. Specific known games include Kaiser bootleg versions of Contra and 月風魔伝 (Getsu Fūma Den). Its UNIF board name is UNL-KS7021A.
Registers
Mask: $F000
$8000: [.... PPP.] - Select 16KiB PRG bank at $8000-$BFFF $9000: [.... ...M] - like VRC2, 0: Vertical Mirroring (PPU A10); 1: Horizontal Mirroring (PPU A11)
Mask: $F007
- $B000: Select 1 KiB CHR-ROM bank at PPU $0000-$03FF
- $B001: Select 1 KiB CHR-ROM bank at PPU $0400-$07FF
- $B002: Select 1 KiB CHR-ROM bank at PPU $0800-$0BFF
- $B003: Select 1 KiB CHR-ROM bank at PPU $0C00-$0FFF
- $B004: Select 1 KiB CHR-ROM bank at PPU $1000-$13FF
- $B005: Select 1 KiB CHR-ROM bank at PPU $1400-$17FF
- $B006: Select 1 KiB CHR-ROM bank at PPU $1800-$1BFF
- $B007: Select 1 KiB CHR-ROM bank at PPU $1C00-$1FFF
Hardware
The 7021A PCB contains a 7400, a 7427, a 7432, a 7474, a 74139, a 74157, a 74174, two 74189s, and the two ROMs.
Notes
- Getsu Fūma Den PCB images and analysis: BBS
