INES Mapper 210

This mapper represents most of the PCBs using the Namcot 175 and Namcot 340 ICs, such as Famista '92 and Wagyan Land 3. It is very similar to iNES Mapper 019, having a Namco 163-class mapper IC with no N163 expansion sound.

The 175 always has hard-wired mirroring. The 340 has an entirely different and incompatible mirroring control from the 163.

Run-time heuristics can determine how the emulator should act:

• if $E000.7 is ever set, this should be a Namcot 340.
• if $E000.6 is set and this isn't a Namcot 163, this is probably a Namcot 340.
• if the game ever writes to $4800, $5000, $5800, $C800, $D000, $D800, or $F800 this should be a Namcot 163
• if the game ever writes to $C000 and this isn't a Namcot 163, this is probably a Namcot 175 with external RAM.

Badly behaved software or software that writes to both sets of mirroring control registers will fail these heuristics.

Naruko provided a table of which games used which ICs and what is necessary for accurate emulation, translated here:

Commercially available games using a Namcot 129/163/175/340
hard	soft	battRAM	yyyy.mm.dd	name	transliterated &// translated	found mixing resistor
129	163	none	1987.12.04	スターウォーズ	Star Wars
163*	163	internal	1988.04.05	独眼竜政宗	Dokuganryuu Masamune	0
163	163	none	1988.05.27	ナムコクラシック	Namco Classic
163	163	none	1988.06.24	妖怪道中記	Youkai Douchuuki / Shadow Land
163*	163	external	1988.07.29	三国志 中原の覇者	Sangokushi: Chuugen no Hasha / Romance of the Three Kingdoms: Champion of the Central Plains	4.7k
163*	163	none	1988.08.12	ファイナルラップ	Final Lap	either 4.7k or 15k
163*	163	none	1988.09.27	えりかとさとるの夢冒険	Erika to Satoru no Yume Bouken / Erika and Satoru's Dream of Adventure	10k
163	163	internal	1988.11.18	貝獣物語	Kaijuu Monogatari / Shell Monsters Story
163*	163	external	1988.12.09	キングオブキングス	King of Kings	4.7k
163*	163	internal	1989.02.17	ハイドライド3	Hydlide 3	0
163*	163	none	1989.03.17	ローリングサンダー	Rolling Thunder	22k
163*	163	internal	1989.04.18	マインドシーカー	Mind Seeker
163	163	none	1989.07.14	ドラゴンニンジャ	Dragon Ninja / Bad Dudes
340*	163	none	1989.07.31	スプラッターハウス	Splatterhouse	n/a
163	163	internal	1989.12.19	ファミスタ'90	Famista '90 (previous games were "Family Stadium Baseball")
163	163	none	1989.12.22	マッピーキッズ	Mappy Kids	10
163*	163	external	1990.04.06	女神転生II	Megami Tensei II / Rebirth of the Goddess II	4.7k
163*	163	internal	1990.06.23	バトルフリート	Battle Fleet
340*	340	none	1990.12.14	ワギャンランド2	Wagyan Land 2	n/a
175	163	none	1990.12.21	ファミスタ'91	Famista '91	n/a
163*	163	external	1991.01.04	じゅうべえくえすと	Juvei Quest
175	340	external	1991.07.19	ファミリーサーキット'91	Family Circuit '91	0 (n/a)
175	340	none	1991.10.04	ちびまる子ちゃん	Chibi Maruko-chan: Uki Uki Shopping	n/a
175*	340	none	1991.12.06	平成天才バカボン	Heisei Tensai Bakabon / Genius Bakabon	n/a
340	340	none	1991.12.20	ファミスタ'92	Famista '92	n/a
163*	163	none	1992.03.13	ナムコクラシックII	Namco Classic II
163*	163	external	1992.06.10	三国志II 覇王の大陸	Sangokushi II: Haou no Tairiku / Romance of the Three Kingdoms II: Overlord of the Continent
340*	340	none	1992.09.22	ドリームマスター	Dream Master	n/a
340	340	none	1992.10.22	トップストライカー	Top Striker	n/a
340*	340	none	1992.12.08	ワギャンランド3	Wagyan Land 3	n/a
340	340	none	1992.12.22	ファミスタ'93	Famista '93	n/a
340	340	none	1993.12.01	ファミスタ'94	Famista '94	n/a

• hard: those marked with * were only found as epoxy: they were determined by connectivity and VRAM /CS behavior
• soft: The Namcot 175 and 340 are similar enough that they can be emulated together
• soft: Categorized as 340 if they don't write to $5800 or $c800
• battRAM:
  • none: Neither external Work RAM nor battery.
  • internal: Battery backup of 163's internal memory.
  • external: External SRAM with battery backup.
• yyyy.mm.dd is the release date.
• Splatterhouse and Famista '91 are the only games that do not use a 163 that can be correctly emulated as using a 163. (Translator suspects the games perform compatibility writes)
• The 129 sounds different from the 163: sometimes it's distorted. (translator: This is the most coherent I could get it) RAM and IRQ are the same as the 163. VRAM behavior has not been tested.

The found mixing resistors were reported in this archived thread from 2ch.