INES Mapper 002: Difference between revisions
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[[Category:iNES Mappers]] | [[Category:iNES Mappers|002]][[Category:in NesCartDB|002]] | ||
[[iNES Mapper 002]] is used to designate the most common configuration of the [[UxROM]] boardset, generalized to support up to 2048 KB of PRG ROM (iNES) or 4096 KB of PRG ROM ([[NES 2.0]]). | [[iNES Mapper 002]] is used to designate the most common configuration of the [[UxROM]] boardset, generalized to support up to 2048 KB of PRG ROM (iNES) or 4096 KB of PRG ROM ([[NES 2.0]]). | ||
Revision as of 20:28, 10 August 2012
iNES Mapper 002 is used to designate the most common configuration of the UxROM boardset, generalized to support up to 2048 KB of PRG ROM (iNES) or 4096 KB of PRG ROM (NES 2.0).
Here are Disch's original notes:
========================
= Mapper 002 =
========================
aka
--------------------------
UxROM (and compatible)
Example Games:
--------------------------
Mega Man
Castlevania
Contra
Duck Tales
Metal Gear
Notes:
---------------------------
UxROM has bus conflicts, however mapper 002 is meant to be UxROM and compatible. So some mappers which were
similar in function, but did not have bus conflicts are included.
Additionally, UxROM does not have an 8 bit reg. UNROM is capped at 128k PRG, and UOROM is capped at 256k.
So to be "safe":
- for homebrewing: assume bus conflicts, do not exceed 256k
- for emudev: assume no bus conflicts, use all 8 PRG reg bits
There is no CHR swapping. Every mapper 002 game I've ever seen has CHR-RAM.
Registers (**BUS CONFLICTS** sometimes):
--------------------------
$8000-FFFF: [PPPP PPPP]
PRG Reg
PRG Setup:
--------------------------
$8000 $A000 $C000 $E000
+---------------+---------------+
| $8000 | { -1} |
+---------------+---------------+
