NES 2.0 Mapper 342: Difference between revisions

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{{DEFAULTSORT:342}}[[Category:Multicart mappers]][[Category:Mappers with large PRG RAM]]
{{DEFAULTSORT:342}}[[Category:Multicart mappers]][[Category:Mappers with large PRG RAM]][[Category:Multi-ASIC mappers]][[Category:Mappers with flash save]]
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 [[NES 2.0 Mapper 268|COOLBOY]] mapper that inspired it, CHR-RAM are 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'''.
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 [[NES 2.0 Mapper 268|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) *                  | 2,0 - A0 and A1 lines configuration:  |                                          |
  |        | 22 (VRC2/VRC4) *                  |    0,0 - like mapper 21              |                                          |
  |        | 23 (VRC2/VRC4) *                  |    0,1 - like mapper 22              |                                          |
  |        | 25 (VRC2/VRC4) *                  |    1,0 - like mapper 23              |                                          |
  |        |                                    |    1,1 - like mapper 25              |                                          |
  |        |                                    | 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=
=See also=
* [https://github.com/coolgirl-multicart/coolgirl-multirom-builder Project on GitHub with schematic and CPLD source code]
* [https://github.com/ClusterM/coolgirl-multirom-builder Project on GitHub with schematic and CPLD source code]
* [https://github.com/ClusterM/fceux/blob/coolgirl/src/boards/coolgirl.cpp FCEUX implementation]
* [https://github.com/TASEmulators/fceux/blob/master/src/boards/coolgirl.cpp FCEUX implementation]

Latest revision as of 10:40, 8 May 2023

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) *                   | 2,0 - A0 and A1 lines configuration:  |                                           |
 |        | 22 (VRC2/VRC4) *                   |     0,0 - like mapper 21              |                                           |
 |        | 23 (VRC2/VRC4) *                   |     0,1 - like mapper 22              |                                           |
 |        | 25 (VRC2/VRC4) *                   |     1,0 - like mapper 23              |                                           |
 |        |                                    |     1,1 - like mapper 25              |                                           |
 |        |                                    | 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

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