NES 2.0 Mapper 366: Difference between revisions
From NESdev Wiki
Jump to navigationJump to search
NewRisingSun (talk | contribs) (Created page with "NES 2.0 Mapper 366 is used for the [http://forums.nesdev.com/viewtopic.php?f=9&t=18248 mapper of the Subor SB97 keyboard famiclone].") |
m (defaultsort) |
||
| (2 intermediate revisions by one other user not shown) | |||
| Line 1: | Line 1: | ||
NES 2.0 Mapper 366 is used for the [ | {{DEFAULTSORT:366}}NES 2.0 Mapper 366 is used for an MMC3-based multicart PCB (GN-45): | ||
* ''4-in-1 (K-3131GS)'' | |||
* ''4-in-1 (K-3131SS)'' | |||
==Outer Bank Register ($6800)== | |||
Mask: unknown, probably $E0F0 | |||
A~FEDC BA98 7654 3210 | |||
------------------- | |||
0110 1000 LOOO .... | |||
|+++------ Select outer 128 KiB PRG-ROM and CHR-ROM bank | |||
+--------- 1=Lock outer bank | |||
This register is accessible regardless of whether WRAM is enabled in the MMC3 clone's A001 register. | |||
It overlays the 8 KiB of WRAM that both multicarts have, making the Lock bit necessary to prevent the outer bank from changing once the game writes to WRAM. | |||
==MMC3-compatible registers== | |||
Mask: $E001 | |||
See [[MMC3]]. | |||
==Note== | |||
[https://github.com/TASVideos/fceux/blob/master/src/boards/mmc3.cpp FCEUX emulates this PCB under mapper number 205] together with "OK-411" ([[NES 2.0 Mapper 361]]), both of which are in turn different from the [[iNES Mapper 205]] described in that mapper's wiki article. | |||
==See also== | |||
[[NES 2.0 Mapper 361]] describes a simpler variant that latches the data bus instead of the address bus.[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]] | |||
Latest revision as of 07:01, 26 May 2020
NES 2.0 Mapper 366 is used for an MMC3-based multicart PCB (GN-45):
- 4-in-1 (K-3131GS)
- 4-in-1 (K-3131SS)
Outer Bank Register ($6800)
Mask: unknown, probably $E0F0
A~FEDC BA98 7654 3210
-------------------
0110 1000 LOOO ....
|+++------ Select outer 128 KiB PRG-ROM and CHR-ROM bank
+--------- 1=Lock outer bank
This register is accessible regardless of whether WRAM is enabled in the MMC3 clone's A001 register. It overlays the 8 KiB of WRAM that both multicarts have, making the Lock bit necessary to prevent the outer bank from changing once the game writes to WRAM.
MMC3-compatible registers
Mask: $E001 See MMC3.
Note
FCEUX emulates this PCB under mapper number 205 together with "OK-411" (NES 2.0 Mapper 361), both of which are in turn different from the iNES Mapper 205 described in that mapper's wiki article.
See also
NES 2.0 Mapper 361 describes a simpler variant that latches the data bus instead of the address bus.
