TxROM: Difference between revisions

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(by extension of the MMC1, I guess 8KB RAM boards can also accept a 8 KB ROM.)
(→‎Solder pad config: Factorize out redundant information)
 
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{{nesdbbox
|unif_wild|-T%ROM|TxROM
|unif_wild|TBROM|TBROM
|unif_wild|TEROM|TEROM
|unif_wild|TFROM|TFROM
|unif_wild|TGROM|TGROM
|unif_wild|TKROM|TKROM
|unif_wild|TK1ROM|TK1ROM
|unif_wild|TKSROM|TKSROM
|unif_wild|TLROM|TLROM
|unif_wild|TL1ROM|TL1ROM
|unif_wild|TL2ROM|TL2ROM
|unif_wild|TLSROM|TLSROM
|unif_wild|TNROM|TNROM
|unif_wild|TQROM|TQROM
|unif_wild|TR1ROM|TR1ROM
|unif_wild|TSROM|TSROM
|unif_wild|TVROM|TVROM
}}
[[Category:MMC3-like mappers]][[Category:Nintendo licensed mappers]]
The generic designation '''TxROM''' refers to cartridge boards made by Nintendo that use the [[MMC3|Nintendo MMC3]] mapper.
The generic designation '''TxROM''' refers to cartridge boards made by Nintendo that use the [[MMC3|Nintendo MMC3]] mapper.


== Board Types ==
The following TxROM boards are known to exist:
The following TxROM boards are known to exist:
{| class="tabular"
{| class="tabular"
! Board || PRG ROM || PRG RAM || CHR || Comments
! Board || PRG ROM || PRG RAM || CHR || Comments
|-
|-
| TBROM || 64 KB || || 16, 32, 64 KB ROM ||
| TBROM || 64 KB || || 16 / 32 / 64 KB ROM ||
|-
|-
| TEROM || 32 KB || || 16, 32, 64 KB ROM || Supports fixed mirroring
| TEROM || 32 KB || || 16 / 32 / 64 KB ROM || Supports fixed mirroring
|-
|-
| TFROM || 128, 256, 512 KB || || 16, 32, 64 KB ROM || Supports fixed mirroring
| TFROM || 128 / 256 / 512 KB || || 16 / 32 / 64 KB ROM || Supports fixed mirroring
|-
|-
| TGROM || 128, 256, 512 KB || || 8 KB RAM/ROM ||  
| TGROM || 128 / 256 / 512 KB || || 8 KB RAM/ROM ||  
|-
|-
| TKROM || 128, 256, 512 KB || 8 KB || 128, 256 KB ROM ||  
| TKROM || 128 / 256 / 512 KB || 8 KB || 128 / 256 KB ROM ||  
|-
|-
| TKSROM || 128, 256, 512 KB || 8 KB || 128 KB ROM || Alternate mirroring control
| [http://forums.nesdev.org/viewtopic.php?f=9&t=9891 TK1ROM] || 128 KB || 8KB || 128KB ROM || Uses [[7432]] for 28-pin CHR ROM
|-
|-
| TLROM || 128, 256, 512 KB || || 128, 256 KB ROM ||  
| [[TKSROM]] || 128 / 256 / 512 KB || 8 KB || 128 KB ROM || Alternate mirroring control, Famicom only
|-
|-
| TL1ROM || || || Nonstandard
| TLROM || 128 / 256 / 512 KB || || 128 / 256 KB ROM ||
|-
|-
| TL2ROM || || || Nonstandard pinout
| TL1ROM || 128 KB || || 128 KB || Uses [[7432]] for 28-pin CHR ROM
|-
|-
| TLSROM || 128, 256, 512 KB || || 128 KB ROM || Alternate mirroring control
| TL2ROM || || || || Nonstandard pinout
|-
|-
| TNROM || 128, 256, 512 KB || 8 KB || 8 KB RAM/ROM || Famicom only
| [https://forums.nesdev.org/viewtopic.php?p=228322#p228322 TLBROM] || 128 KB || || 128 KB ROM || Uses 74541 to compensate for too-slow CHR ROM
|-
|-
| TQROM || 128 KB || || 16, 32, 64 KB ROM + 8 KB RAM ||  
| [[TLSROM]] || 128 / 256 / 512 KB || || 128 KB ROM || Alternate mirroring control
|-
|-
| TR1ROM || 128, 256, 512 KB || || 64 KB ROM + 4 KB VRAM (4-screen [[Mirroring]]) || NES only
| TNROM || 128 / 256, 512 KB || 8 KB || 8 KB RAM/ROM || Famicom only
|-
|-
| TSROM || 128, 256, 512 KB || 8 KB (no battery) || 128, 256 KB ROM ||  
| [[TQROM]] || 128 KB || || 16 / 32 / 64 KB ROM + 8 KB RAM ||  
|-
|-
| TVROM || 64 KB || || 16, 32, 64 KB ROM + 4 KB VRAM (4-screen [[Mirroring]]) || NES only
| [http://bootgod.dyndns.org:7777/profile.php?id=2890 TR1ROM] || 128 / 256 / 512 KB || || 64 KB ROM + 4 KB VRAM (4-screen [[Mirroring]]) || NES only
|-
| TSROM || 128 / 256 / 512 KB || 8 KB (no battery) || 128 / 256 KB ROM ||
|-
| [http://bootgod.dyndns.org:7777/profile.php?id=137 TVROM] || 64 KB || || 16 / 32 / 64 KB ROM + 4 KB VRAM (4-screen [[Mirroring]]) || NES only
|}
|}


== Solder pad config ==
== Solder pad config ==
 
=== [[iNES Mapper 206|Namco 108]] backwards compatibility (TEROM and TFROM)===
=== Namco 108 backwards compatibility mode (TEROM and TFROM boards only) ===
* Normal mode: 'CL1' connected, 'CL2' connected, 'H' disconnected, 'V' disconnected.
 
* Backwards compatible with horizontal [[mirroring]]: 'CL1' disconnected, 'CL2' disconnected, 'H' disconnected, 'V' connected
* Normal mode (default) : 'CL1' connected, 'CL2' connected, 'H' disconnected, 'V' disconnected.
* Backwards compatible with vertical mirroring: 'CL1' disconnected, 'CL2' disconnected, 'H' connected, 'V' disconnected
* [[DxROM]] backward compatibility mode with Horizontal mirroring : 'CL1' disconnected, 'CL2' disconnected, 'H' disconnected, 'V' connected.
* [[DxROM]] backward compatibility mode with Vertical mirroring : 'CL1' disconnected, 'CL2' disconnected, 'H' connected, 'V' disconnected.


Connecting 'CL1' enables MMC3-controlled mirroring, while connecting 'CL2' enables IRQs.
Connecting 'CL1' enables MMC3-controlled mirroring, while connecting 'CL2' enables IRQs.
However, the additional bankswitching modes available by the MMC3 that weren't available with the 109 chip used on DEROM boards are still present.
However, the additional bankswitching modes available by the MMC3 that weren't available with the Namco chip used on DEROM boards are still present and activated by bits 7-6 of port $8000.


=== Battery retention (TNROM, TKROM and TKSROM boards only) : ===
=== Battery retention (TNROM, TKROM and TKSROM) ===


* PRG RAM retaining data : 'SL' disconnected, Battery, D1, D2, R1 R2 and R3 present.
* PRG RAM retaining data: 'SL' disconnected, Battery, D1, D2, R1 R2 and R3 present.
* PRG RAM not retaining data : 'SL' connected, leave slots for Battery, D1, D2, R1, R2 and R3 free.
* PRG RAM not retaining data: 'SL' connected, leave slots for Battery, D1, D2, R1, R2 and R3 free.


== Various notes ==
== Various notes ==

Latest revision as of 10:17, 1 November 2018

NESCartDB
TxROM
TBROM
TEROM
TFROM
TGROM
TKROM
TK1ROM
TKSROM
TLROM
TL1ROM
TL2ROM
TLSROM
TNROM
TQROM
TR1ROM
TSROM
TVROM

The generic designation TxROM refers to cartridge boards made by Nintendo that use the Nintendo MMC3 mapper.

Board Types

The following TxROM boards are known to exist:

Board PRG ROM PRG RAM CHR Comments
TBROM 64 KB 16 / 32 / 64 KB ROM
TEROM 32 KB 16 / 32 / 64 KB ROM Supports fixed mirroring
TFROM 128 / 256 / 512 KB 16 / 32 / 64 KB ROM Supports fixed mirroring
TGROM 128 / 256 / 512 KB 8 KB RAM/ROM
TKROM 128 / 256 / 512 KB 8 KB 128 / 256 KB ROM
TK1ROM 128 KB 8KB 128KB ROM Uses 7432 for 28-pin CHR ROM
TKSROM 128 / 256 / 512 KB 8 KB 128 KB ROM Alternate mirroring control, Famicom only
TLROM 128 / 256 / 512 KB 128 / 256 KB ROM
TL1ROM 128 KB 128 KB Uses 7432 for 28-pin CHR ROM
TL2ROM Nonstandard pinout
TLBROM 128 KB 128 KB ROM Uses 74541 to compensate for too-slow CHR ROM
TLSROM 128 / 256 / 512 KB 128 KB ROM Alternate mirroring control
TNROM 128 / 256, 512 KB 8 KB 8 KB RAM/ROM Famicom only
TQROM 128 KB 16 / 32 / 64 KB ROM + 8 KB RAM
TR1ROM 128 / 256 / 512 KB 64 KB ROM + 4 KB VRAM (4-screen Mirroring) NES only
TSROM 128 / 256 / 512 KB 8 KB (no battery) 128 / 256 KB ROM
TVROM 64 KB 16 / 32 / 64 KB ROM + 4 KB VRAM (4-screen Mirroring) NES only

Solder pad config

Namco 108 backwards compatibility (TEROM and TFROM)

  • Normal mode: 'CL1' connected, 'CL2' connected, 'H' disconnected, 'V' disconnected.
  • Backwards compatible with horizontal mirroring: 'CL1' disconnected, 'CL2' disconnected, 'H' disconnected, 'V' connected
  • Backwards compatible with vertical mirroring: 'CL1' disconnected, 'CL2' disconnected, 'H' connected, 'V' disconnected

Connecting 'CL1' enables MMC3-controlled mirroring, while connecting 'CL2' enables IRQs. However, the additional bankswitching modes available by the MMC3 that weren't available with the Namco chip used on DEROM boards are still present and activated by bits 7-6 of port $8000.

Battery retention (TNROM, TKROM and TKSROM)

  • PRG RAM retaining data: 'SL' disconnected, Battery, D1, D2, R1 R2 and R3 present.
  • PRG RAM not retaining data: 'SL' connected, leave slots for Battery, D1, D2, R1, R2 and R3 free.

Various notes

Boards with 4-screen mirroring uses a 8 KB SRAM chip, but only 4 KB is actually used. The 2 KB VRAM inside of the console is always disabled, and the CIRAM A10 pin of the MMC3 doesn't go to anything.

TLSROM and TKSROM boards have different mirroring control than other MMC3 boards. The mirroring is controlled directly by MMC3's CHR A17 line, and MMC3's CIRAM A10 pin doesn't go to anything. Due to their incompatibility with other MMC3 boards on a software viewpoint, they are assigned to INES Mapper 118 instead of mapper 4.

TQROM board has both CHR ROM and RAM. Bit 6 of the bank number, which appears on MMC3's CHR A16 line, controls whenever CHR RAM or CHR-ROM is enabled. A 74HC32 chip is used to combine this with other chip enable signals for the CHR-ROM and the CHR-RAM chips. Due to this incompatibility with the other MMC3 boards on a software viewpoint, this board is assigned to INES Mapper 119 instead of mapper 4.

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