INES Mapper 225: Difference between revisions
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[[Category:iNES Mappers|225]][[Category:Multicart mappers|225]] | [[Category:iNES Mappers|225]][[Category:Multicart mappers|225]]INES Mapper 225 denotes the '''ET-4310''' (60-pin) and '''K-1010''' (72-pin) multicart circuit boards. | ||
Here are Disch's original notes: | Here are Disch's original notes: | ||
======================== | ======================== | ||
| Line 45: | Line 45: | ||
PRG Mode 1: | $8000 | $8000 | | PRG Mode 1: | $8000 | $8000 | | ||
+---------------+---------------+ | +---------------+---------------+ | ||
Nestopia does not implement the 4 × 4 bit RAM, and FCEUX ceased to support it between 2.1.5 and 2.2.1 | |||
This looks like a duplicate of [[iNES Mapper 255]]. It's not clear why Nestopia implemented it twice. | |||
Pictures of the PCB show physical releases both [https://forums.nesdev.org/viewtopic.php?p=210128#p210128 with] and [https://forums.nesdev.org/viewtopic.php?p=209732#p209732 without] the 74'670 that make up the extra RAM. Carts are slightly buggy without it. | |||
== See also == | |||
* [http://www.romhacking.net/documents/362/ NES Mapper List] by Disch | |||
* [http://nesdev.org/225.txt iNES mapper 225], unknown author | |||
Latest revision as of 13:36, 5 December 2021
INES Mapper 225 denotes the ET-4310 (60-pin) and K-1010 (72-pin) multicart circuit boards.
Here are Disch's original notes:
========================
= Mapper 225 =
========================
Example Games:
--------------------------
52 Games
58-in-1
64-in-1
Registers:
---------------------------
$5800-5803: [.... RRRR] RAM (readable/writable)
(16 bits of RAM -- 4 bits in each of the 4 regs)
$5804-5FFF: mirrors $5800-5803
$8000-FFFF: A~[.HMO PPPP PPCC CCCC]
H = High bit (acts as bit 7 for PRG and CHR regs)
M = Mirroring (0=Vert, 1=Horz)
O = PRG Mode
P = PRG Reg
C = CHR Reg
CHR Setup:
---------------------------
$0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00
+---------------------------------------------------------------+
CHR Mode 0: | $8000 |
+---------------------------------------------------------------+
PRG Setup:
---------------------------
$8000 $A000 $C000 $E000
+-------------------------------+
PRG Mode 0: | <$8000> |
+-------------------------------+
PRG Mode 1: | $8000 | $8000 |
+---------------+---------------+
Nestopia does not implement the 4 × 4 bit RAM, and FCEUX ceased to support it between 2.1.5 and 2.2.1
This looks like a duplicate of iNES Mapper 255. It's not clear why Nestopia implemented it twice.
Pictures of the PCB show physical releases both with and without the 74'670 that make up the extra RAM. Carts are slightly buggy without it.
See also
- NES Mapper List by Disch
- iNES mapper 225, unknown author
