NES 2.0 Mapper 342

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NES 2.0 Mapper 342 is used for the homebrew COOLGIRL multicart. In addition to native registers, it can simulate about 25 commercial-era mappers on a hardware level. It can address up to 128 MiB of PRG-ROM, 512 KiB of CHR-RAM, and 32 KiB of WRAM. Like the COOLBOY mapper that inspired it, CHR-RAM is filled with pattern data copied from PRG-ROM by the multicart menu after a game has been selected. Its UNIF board name is just COOLGIRL.

Registers

Range: $5000-$5FFF

Mask: $5007

All registers are $00 on power-on and reset.

$5xx0

 7  bit  0
 ---- ----
 PPPP PPPP
 |||| ||||
 ++++-++++-- PRG base offset (A29-A22)

$5xx1

 7  bit  0
 ---- ----
 PPPP PPPP
 |||| ||||
 ++++-++++-- PRG base offset (A21-A14)

$5xx2

 7  bit  0
 ---- ----
 AMMM MMMM
 |||| ||||
 |+++-++++-- PRG mask (A20-A14, inverted+anded with PRG address)
 +---------- CHR mask (A18, inverted+anded with CHR address)

$5xx3

 7  bit  0
 ---- ----
 BBBC CCCC
 |||| ||||
 |||+-++++-- CHR bank A (bits 7-3)
 +++-------- PRG banking mode (see below)

$5xx4

 7  bit  0
 ---- ----
 DDDE EEEE
 |||| ||||
 |||+-++++-- CHR mask (A17-A13, inverted+anded with CHR address)
 +++-------- CHR banking mode (see below)

$5xx5

 7  bit  0
 ---- ----
 CDDE EEWW
 |||| ||||
 |||| ||++-- 8KiB WRAM page at $6000-$7FFF
 |+++-++---- PRG bank A (bits 5-1)
 +---------- CHR bank A (bit 8)

$5xx6

 7  bit  0
 ---- ----
 FFFM MMMM
 |||| ||||
 |||+ ++++-- Mapper code (bits 4-0, see below)
 +++-------- Flags 2-0, functionality depends on selected mapper

$5xx7

 7  bit  0
 ---- ----
 LMTR RSNO
 |||| |||+-- Enable WRAM (read and write) at $6000-$7FFF
 |||| ||+--- Allow writes to CHR RAM
 |||| |+---- Allow writes to flash chip
 |||+-+----- Mirroring (00=vertical, 01=horizontal, 10=1Sa, 11=1Sb)
 ||+-------- Enable four-screen mode
 |+-- ------ Mapper code (bit 5, see below)
 +---------- Lockout bit (prevent further writes to all registers)

Mapper codes

 | Code   | iNES mapper number(s) and name(s)  | Flags meaning                         | Notes                                     |
 | ====== + ================================== + ===================================== + ========================================= |
 | 000000 | 0 (NROM) †                         |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 000001 | 2 (UxROM) †                        | 0 - enable "Fire Hawk" mirroring for  | Mapper 2 is fully compartible with mapper |
 |        | 71 (Codemasters) *                 |     mapper 71 (Codemasters)           | 71 but "Fire Hawk" only uses mirroring    |
 |        | 30 (UNROM-512)                     | 1 - Enable one screen mirroring       | control. UNROM-512 self-writable feature  |
 |        |                                    |     select for mapper 30 (UNROM-512)  | is not supported                          |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 000010 | 2 (CNROM) †                        |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 000011 | 78 (Irem) *                        |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 000100 | 97 (Irem's TAM-S1)                 |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 000101 | 93 (Sunsoft-2) *                   |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 000110 | 163 (Nanjing)                      |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 000111 | 18 (Jaleco SS 88006)               |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 001000 | 7 (AxROM) †                        | 0 - disable mirroring control, used   | Can be oversized to 512 KiB.              |
 |        | 34 (BNROM, NINA-001) *             |     to select mapper 34 instead of 7  | iNES Mapper 034 is used to designate both |
 |        |                                    |                                       | the BNROM and NINA-001 boards but only    |
 |        |                                    |                                       | BNROM is supported                        |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 001001 | 228 (Action 52)                    |                                       | Only Cheetahmen II is supported           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 001010 | 11 (Color Dreams) *                |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 001011 | 66 (GxROM) *                       |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 001100 | 87 *                               |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 001101 | 90 (J.Y. Company) *                |                                       | Partial support only, can be used for     |
 |        |                                    |                                       | "Aladdin" and "Super Mario World" only.   |
 |        |                                    |                                       | "Super Mario World" requires to enable    |
 |        |                                    |                                       | accurate IRQs and multiplier (disabled by |
 |        |                                    |                                       | default)                                  |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 001110 | 65 (Irem's H3001) *                |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 001111 | 5 (MMC5) *                         |                                       | Experimental partically support, can be   |
 |        |                                    |                                       | used for "Castlevania 3 (U)" only         |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 010000 | 1 (MMC1) †                         | 0 - enable 16KiB of WRAM              |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 010001 | 9 (MMC2) *                         |                                       |                                           |
 |        | 10 (MMC4) *                        | 0 - 0=MMC2, 1=MMC4                    |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 010010 | 70 *                               | 0 - 0=70, 1=152                       |                                           |
 |        | 152 *                              |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 010011 | 73 (VRC3)                          |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 010100 | 4 (MMC3/MMC6) †                    | 0 - use mapper 118 (TxROM)            | Can be oversized up to 2 MiB              |
 |        | 118 (TxROM) *                      | 1 - use mapper 189                    |                                           |
 |        | 189 *                              | 2 - use mapper 206                    |                                           |
 |        | 206 (Namco, Tengen, others)        |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 010101 | 112                                |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 010110 | 33 (Taito) *                       | 0 - 0=33, 1=48                        |                                           |
 |        | 48 (Taito) *                       |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 010111 | 42 (FDS conversions) *             |                                       | Interrupts disabled by default            |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 011000 | 21 (VRC2/VRC4) *                   | 0 - switch A0 and A1 lines:           |                                           |
 |        | 22 (VRC2/VRC4) *                   |     0=A0,A1 like VRC2b (mapper 23),   |                                           |
 |        | 23 (VRC2/VRC4) *                   |     1=A1,A0 like VRC2a(22), VRC2c(25) |                                           |
 |        | 25 (VRC2/VRC4) *                   | 1 - divide CHR bank select by two     |                                           |
 |        |                                    |     (VRC2a, mapper 22)                |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 011001 | 69 (Sunsoft FME-7) *               |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 011010 | 32 (IREM G-101) *                  |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 011011 | 79 (NINA-03/06)                    |                                       |                                           |
 |        | 146 (Sachen 3015)                  |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 011100 | 133 (Sachen)                       |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 011101 | 36 (TXC's PCB 01-22000-400)        |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 011110 | Reserved                           |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 011111 | 184 (Sunsoft-1)                    |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 100000 | 38                                 |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 100001 | Reserved                           |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 100010 | 75 (VRC1)                          |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 100011 | 83                                 | 0 - DIP switch 0                      | Partial support, submapper 1 requires     |
 |        |                                    | 1 - DIP switch 1                      | 512 KiB of CHR RAM                        |
 |        |                                    | 2 - use submapper 1                   |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 100100 | 67 (Sunsoft-3)                     |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | 100101 | 89 (Sunsoft-2 on Sunsoft-3 PCB)    |                                       |                                           |
 | ------ + ---------------------------------- + ------------------------------------- + ----------------------------------------- |
 | ...... | Reserved                           |                                       |                                           |
  
 † - very popular mappers, can't be disabled in config
 * - enabled by default in config

PRG banking modes

Power-on/reset state: A=0, B=~2, C=~1, D=~0

 | Code | $8000 | $A000 | $E000 | $C000 | Notes                                    |
 | ==== + ===== + ===== + ===== + ===== + ======================================== |
 | 000  |       A       |       C       | UxROM, MMC4, MMC1 mode #3, etc.          |
 | ---- + ------------- + ------------- + ---------------------------------------- |
 | 001  |       C       |       A       | Mapper 97 (TAM-S1)                       |
 | ---- + ------------- + ------------- + ---------------------------------------- |
 | 010  |           Reserved            |                                          |
 | ---- + ----------------------------- + ---------------------------------------- |
 | 011  |           Reserved            |                                          |
 | ---- + ----- + ----- + ----- + ----- + ---------------------------------------- |
 | 100  |   A   |   B   |   C   |   D   | Universal, used by MMC3 mode 0, etc.     |
 | ---- + ----- + ----- + ----- + ----- + ---------------------------------------- |
 | 101  |   C   |   B   |   A   |   D   | MMC3 mode 1                              |
 | ---- + ----- + ----- + ----- + ----- + ---------------------------------------- |
 | 110  |               B               | Mapper 163                               |
 | ---- + ----------------------------- + ---------------------------------------- |
 | 111  |               A               | AxROM, MMC1 modes 0/1, Color Dreams      |

CHR banking modes

Power-on/reset state: A=0, B=1, C=2, D=3, E=4, F=5, G=6, H=7

 | Code | $0000 | $0400 | $0800 | $0C00 | $1000 | $1400 | $1800 | $1C00 | Notes                                    |
 | ==== + ===== + ===== + ===== + ===== + ===== + ===== + ===== + ===== + ======================================== |
 | 000  |                               A                               | Used by many simple mappers              |
 | ---- + ------------------------------------------------------------- + ---------------------------------------- |
 | 001  |                          Special mode                         | Used by mapper 163                       |
 | ---- + ----- + ----- + ----- + ----- + ----- + ----- + ----- + ----- + ---------------------------------------- |
 | 010  |       A       |       C       |   E   |   F   |   G   |   H   | Used by MMC3 mode 0                      |
 | ---- + ----- + ----- + ----- + ----- + ----- + ----- + ----- + ----- + ---------------------------------------- |
 | 011  |   E   |   F   |   G   |   H   |       A       |       C       | Used by MMC3 mode 1                      |
 | ---- + ----- + ----- + ----- + ----- + ------------- + ------------- + ---------------------------------------- |
 | 100  |               A               |               E               | Used by MMC1                             |
 | ---- + ----------------------------- + ------------- + ------------- + ---------------------------------------- |
 | 101  |              A/B              |              E/F              | MMC2/MMC4, switched by tiles $FD or $FE  |
 | ---- + ------- ----- + ------------- + ------------- + ------------- + ---------------------------------------- |
 | 110  |       A       |       C       |       E       |       G       | Used by many complicated mappers         |
 | ---- + ----- + ----- + ----- + ----- + ----- + ----- + ----- + ----- + ---------------------------------------- |
 | 111  |   A   |   B   |   C   |   D   |   E   |  F    |   G   |   H   | Used by very complicated mappers         |

See also