INES Mapper 016

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iNES Mapper 016 is used for some of the Bandai FCG boards, namely, boards with the FCG-1 ASIC that supports no EEPROM, and the LZ93D50 ASIC with no or 256 bytes of EEPROM.

INES Mapper 016 submapper table
Submapper # Meaning Note
0 Unspecified Emulate both FCG-1/2 and LZ93D50 chips in their respective CPU address ranges.
1 LZ93D50 with 128 byte serial EEPROM (24C01) Deprecated, use INES Mapper 159 instead.
2 Datach Joint ROM System Deprecated, use INES Mapper 157 instead.
3 8 KiB of WRAM instead of serial EEPROM Deprecated, use INES Mapper 153 instead.
4 FCG-1/2 Responds only in the CPU $6000-$7FFF address range; IRQ counter is not latched.
5 LZ93D50 with no or 256-byte serial EEPROM (24C02) Responds only in the CPU $8000-$FFFF address range; IRQ counter is latched.

Game List

Name Chip EEPROM NES 2.0 Submapper NES 2.0 Byte 10
Akuma-kun: Makai no Wana FCG-2 - 4 $00
Crayon Shin-chan: Ora to Poi Poi LZ93D50 - 5 $00
Dragon Ball: Daimaou Fukkatsu FCG-1 - 4 $00
Dragon Ball 3: Gokuu Den FCG-2 - 4 $00
Dragon Ball Z II: Gekishin Freezer!! LZ93D50 24C02 5 $20
Dragon Ball Z III: Ressen Jinzou Ningen LZ93D50 24C02 5 $20
Dragon Ball Z Gaiden: Saiya-jin Zetsumetsu Keikaku LZ93D50 24C02 5 $20
Famicom Jump: Hero Retsuden FCG-2 - 4 $00
Meimon! Dai-3 Yakyuu-bu FCG-1 - 4 $00
Nishimura Kyoutarou Mystery: Blue Train Satsujin Jiken FCG-1 - 4 $00
Rokudenashi Blues LZ93D50 24C02 5 $20
Sakigake!! Otoko Juku: Shippu 1-gou Sei FCG-1 - 4 $00
SD Gundam Gaiden - Knight Gundam Monogatari 2: Hikari no Kishi LZ93D50 24C02 5 $20
SD Gundam Gaiden - Knight Gundam Monogatari 3: Densetsu no Kishidan LZ93D50 24C02 5 $20

Banks

  • CPU $8000-$BFFF: 16 KiB switchable PRG ROM bank
  • CPU $C000-$FFFF: 16 KiB PRG ROM bank, fixed to the last bank
  • PPU $0000-$03FF: 1 KiB switchable CHR ROM bank
  • PPU $0400-$07FF: 1 KiB switchable CHR ROM bank
  • PPU $0800-$0BFF: 1 KiB switchable CHR ROM bank
  • PPU $0C00-$0FFF: 1 KiB switchable CHR ROM bank
  • PPU $1000-$13FF: 1 KiB switchable CHR ROM bank
  • PPU $1400-$17FF: 1 KiB switchable CHR ROM bank
  • PPU $1800-$1BFF: 1 KiB switchable CHR ROM bank
  • PPU $1C00-$1FFF: 1 KiB switchable CHR ROM bank

Registers

Read Serial EEPROM ($6000-$7FFF read, Submapper 5 only)

Mask: $E000

7  bit  0
---- ----
xxxE xxxx
|||| ||||
+++|-++++- Open bus
   +------ Data out from I²C EEPROM

CHR-ROM Bank Select ($6000-$6007 write, Submapper 4; $8000-$8007 write, Submapper 5)

Mask: $E00F (Submapper 4), $800F (Submapper 5)

7  bit  0
---- ----
CCCC CCCC
|||| ||||
++++-++++-- 1 KiB CHR-ROM bank number
  • $xxx0: Select 1 KiB CHR-ROM bank at PPU $0000-$03FF
  • $xxx1: Select 1 KiB CHR-ROM bank at PPU $0400-$07FF
  • $xxx2: Select 1 KiB CHR-ROM bank at PPU $0800-$0BFF
  • $xxx3: Select 1 KiB CHR-ROM bank at PPU $0C00-$0FFF
  • $xxx4: Select 1 KiB CHR-ROM bank at PPU $1000-$13FF
  • $xxx5: Select 1 KiB CHR-ROM bank at PPU $1400-$17FF
  • $xxx6: Select 1 KiB CHR-ROM bank at PPU $1800-$1BFF
  • $xxx7: Select 1 KiB CHR-ROM bank at PPU $1C00-$1FFF

PRG-ROM Bank Select ($6008 write, Submapper 4; $8008 write, Submapper 5)

Mask: $E00F (Submapper 4), $800F (Submapper 5)

7  bit  0
---- ----
.... PPPP
     ||||
     ++++-- Select 16 KiB PRG-ROM bank at CPU $8000-$BFFF

Nametable Mirroring Type Select ($6009 write, Submapper 4; $8009 write, Submapper 5)

Mask: $E00F (Submapper 4), $800F (Submapper 5)

7  bit  0
---- ----
.... ..MM
       ||
       ++-- Select nametable mirroring type
             0: Vertical
             1: Horizontal
             2: One-screen, page 0
             3: One-screen, page 1

IRQ Control ($600A write, Submapper 4; $800A write, Submapper 5)

Mask: $E00F (Submapper 4), $800F (Submapper 5)

7  bit  0
---- ----
.... ...C
        |
        +-- IRQ counter control
             0: Counting disabled
             1: Counting enabled
  • Writing to this register acknowledges a pending IRQ.
  • On the LZ93D50 (Submapper 5), writing to this register also copies the latch to the actual counter.
  • If a write to this register enables counting while the counter is holding a value of zero, an IRQ is generated immediately.

IRQ Latch/Counter ($600B-$600C write, Submapper 4; $800B-$800C write, Submapper 5)

Mask: $E00F (Submapper 4), $800F (Submapper 5)

   $C         $B
7  bit  0  7  bit  0
---- ----  ---- ----
CCCC CCCC  CCCC CCCC
|||| ||||  |||| ||||
++++-++++--++++-++++-- Counter value (little-endian)
  • If counting is enabled, the counter decreases on every M2 cycle. When it holds a value of zero, an IRQ is generated.
  • On the FCG-1/2 (Submapper 4), writing to these two registers directly modifies the counter itself; all such games therefore disable counting before changing the counter value.
  • On the LZ93D50 (Submapper 5), these registers instead modify a latch that will only be copied to the actual counter when register $800A is written to.

EEPROM Control ($800D write, Submapper 5 only)

Mask: $800F

7  bit  0
---- ----
RDC. ....
|||
||+-------- I²C SCL
|+--------- I²C SDA
+---------- Direction bit (1=Enable Read)
  • This register only exists on the LZ93D50 (Submapper 5), and only has an effect if a 24C02 EEPROM is present.
  • Please refer to generic I²C tutorials and the 24C02 datasheet on how to operate or emulate this register correctly.

Similar Mappers

  • INES Mapper 153 replaces the serial EEPROM with 8 KiB of battery-backed WRAM, and uses CHR-RAM instead of CHR-ROM.
  • INES Mapper 157 adds a barcode reader, support for a second EEPROM, and uses CHR-RAM instead of CHR-ROM.
  • INES Mapper 159 replaces the 256 byte with an 128 byte serial EEPROM.

See Also

A discrete logic clone of the FCG-2 has been found and reverse-engineered by Krzysiobal

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