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bus/nes: Fixed hardwired 4-screen mirroring for MMC3 games. (#8620)

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- Fixes most graphics glitches in Rad Racer II and unlicensed Jurassic Boy 2, Rocman X carts.
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0kmg 2021-09-25 11:42:28 -08:00 committed by GitHub
parent 606b7a8d7c
commit 9ca2d514b7
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 6 additions and 2 deletions
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5
hash/nes.xml
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@ -30488,7 +30488,7 @@ license:CC0
</part>
</software>
<software name="radracr2" supported="partial">
<software name="radracr2">
<description>Rad Racer II (USA)</description>
<year>1990</year>
<publisher>Square</publisher>
@ -53095,6 +53095,7 @@ preliminary proto for the PAL version, still running on NTSC systems) or the gfx
<part name="cart" interface="nes_cart">
<feature name="slot" value="txrom" />
<feature name="pcb" value="NES-TLROM" />
<feature name="mirroring" value="4screen" />
<dataarea name="chr" size="131072">
<rom name="jurassic boy 2 (asia) (unl).chr" size="131072" crc="6f043956" sha1="30b107c995edd9b986a496d54d7581f5a6e187ce" offset="00000" status="baddump" />
</dataarea>
@ -53129,6 +53130,7 @@ preliminary proto for the PAL version, still running on NTSC systems) or the gfx
<part name="cart" interface="nes_cart">
<feature name="slot" value="txrom" />
<feature name="pcb" value="NES-TLROM" />
<feature name="mirroring" value="4screen" />
<dataarea name="chr" size="262144">
<rom name="rocman x (asia) (unl).chr" size="262144" crc="dcb06887" sha1="5e846b18a5caf16b1fb384a08b13b2e08d7a45e6" offset="00000" status="baddump" />
</dataarea>
@ -53146,6 +53148,7 @@ preliminary proto for the PAL version, still running on NTSC systems) or the gfx
<part name="cart" interface="nes_cart">
<feature name="slot" value="txrom" />
<feature name="pcb" value="NES-TLROM" />
<feature name="mirroring" value="4screen" />
<dataarea name="chr" size="262144">
<rom name="rocman x (sachen) (japan).chr" size="262144" crc="5da2317a" sha1="ba45052ed4a2d8dc1320e6ec0ade293493322c4a" offset="00000" status="baddump" />
</dataarea>

1
src/devices/bus/nes/mmc3.cpp
View File

@ -283,6 +283,7 @@ void nes_txrom_device::txrom_write(offs_t offset, uint8_t data)
break;
case 0x2000:
if (m_mirroring != PPU_MIRROR_4SCREEN)
set_nt_mirroring(BIT(data, 0) ? PPU_MIRROR_HORZ : PPU_MIRROR_VERT);
break;