INES Mapper 071: Difference between revisions
(based on KH's doc, by request at http://nesdev.parodius.com/bbs/viewtopic.php?p=73044#73044) |
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== Registers == | == Registers == | ||
=== Outer bank select ($8000-$BFFF) === | === Outer bank select ($8000-$BFFF) === | ||
This register is present only on the Quattro carts, which use the BF9096 IC. | This register is present only on the Quattro carts, which use the BF9096 IC, and on the CCU in the Aladdin adapter (per [http://kevtris.org/mappers/camerica/aladdin.html KH]) | ||
7 bit 0 | 7 bit 0 | ||
---- ---- | ---- ---- | ||
| Line 35: | Line 35: | ||
| | | | ||
+----- Select 1 KB CIRAM bank for PPU $2000-$2FFF | +----- Select 1 KB CIRAM bank for PPU $2000-$2FFF | ||
=== Bank select ($C000-$FFFF) === | === Bank select ($C000-$FFFF) === | ||
This register is present on all games: BF9093 (most common), BF9096, and | This register is present on all games: BF9093 (most common), BF9096, BF9097, and CCU. | ||
On BF9096, only the low two bits are implemented. | On BF9096, only the low two bits are implemented. | ||
On BF9097, only the low three bits are implemented. | |||
7 bit 0 | 7 bit 0 | ||
---- ---- | ---- ---- | ||
Revision as of 00:51, 24 January 2011
iNES Mapper 071 is assigned to games developed by Codemasters and published by Camerica. It's largely a clone of UNROM, and Camerica games were initially emulated under iNES Mapper 002 before 071 was assigned.
Overview
- PRG ROM size: 128 or 256 KB
- PRG ROM bank size: 16 KB inner
- PRG RAM: None
- CHR capacity: 8 KB RAM
- CHR bank size: Not bankswitched
- Nametable mirroring: Hardwired H or V (most) or mapper controlled 1-screen (Fire Hawk)
- Subject to bus conflicts: ???
Banks
$8000-$BFFF: Switchable $C000-$FFFF: Fixed to last bank $8000-$FFFF: In the "Quattro" games, A16 and A17 are controlled by a separate register, allowing 64 KiB super-banks.
Solder pad config
To do
Registers
Outer bank select ($8000-$BFFF)
This register is present only on the Quattro carts, which use the BF9096 IC, and on the CCU in the Aladdin adapter (per KH)
7 bit 0 ---- ---- xxBB XXXX || ++----- Select 64 KB PRG ROM bank for CPU $8000-$FFFF
Mirroring ($8000-$9FFF)
This register is present only on Fire Hawk, which uses the BF9097 IC.
7 bit 0 ---- ---- xxxM xxxx | +----- Select 1 KB CIRAM bank for PPU $2000-$2FFF
Bank select ($C000-$FFFF)
This register is present on all games: BF9093 (most common), BF9096, BF9097, and CCU. On BF9096, only the low two bits are implemented. On BF9097, only the low three bits are implemented.
7 bit 0
---- ----
xxxx PPPP
||||
++++- Select 16 KB PRG ROM bank for CPU $8000-$BFFF
CIC stun control ($E000-$FFFF)
This register is present on all games. A0 controls a latch going to the CIC stun circuit.
Pinout
BF9093
BF9096 BF9097
,-v-.
+5V -| |- CPU A14 CPU A14
NES /ROMSEL -| |- A13 A13
PRG /CE -| |- PRG A15 PRG A15
PRG A14 -| |- PRG A16 CIRAM A10
M2 -| |- GND PRG A16
A0 -| |- R/W GND
D0 -| |- PRG A17 R/W
D1 -| |- CIC CIC
D2 -| |- D4 D4
GND -| |- D3 D3
`---'
