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Merge pull request #3889 from bbbradsmith/2a03pur_fix

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2a03pur.cpp fix out of bounds access for ROM <1024k
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ajrhacker 2018-08-24 08:22:33 -04:00 committed by GitHub
commit 726cdca4dd
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1 changed files with 4 additions and 6 deletions
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10
src/devices/bus/nes/2a03pur.cpp
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@ -7,7 +7,7 @@
Here we emulate the PCB designed by infiniteneslives and Here we emulate the PCB designed by infiniteneslives and
rainwarrior for this homebew multicart [mapper 30?] rainwarrior for this homebew multicart [mapper 31]
The main difference of this PCB compared to others is that it The main difference of this PCB compared to others is that it
uses 4k PRG banks! uses 4k PRG banks!
@ -46,7 +46,7 @@ void nes_2a03pur_device::device_start()
common_start(); common_start();
save_item(NAME(m_reg)); save_item(NAME(m_reg));
memset(m_reg, 0x00, sizeof(m_reg)); memset(m_reg, 0x00, sizeof(m_reg));
m_reg[7] = 0xff; m_reg[7] = 0xff & ((m_prg_chunks << 2) - 1);
} }
void nes_2a03pur_device::pcb_reset() void nes_2a03pur_device::pcb_reset()
@ -88,9 +88,7 @@ void nes_2a03pur_device::pcb_reset()
so any bank that is mapped to $F000 after power-on so any bank that is mapped to $F000 after power-on
should contain a valid reset vector. should contain a valid reset vector.
At present, the project uses iNES mapper 30 to This has been assigned to iNES mapper 31.
designate this mapper. No mapper number has been
officially reserved yet.
-------------------------------------------------*/ -------------------------------------------------*/
WRITE8_MEMBER(nes_2a03pur_device::write_l) WRITE8_MEMBER(nes_2a03pur_device::write_l)
@ -98,7 +96,7 @@ WRITE8_MEMBER(nes_2a03pur_device::write_l)
LOG_MMC(("2a03 puritans write_l, offset: %04x, data: %02x\n", offset, data)); LOG_MMC(("2a03 puritans write_l, offset: %04x, data: %02x\n", offset, data));
offset += 0x100; offset += 0x100;
if (offset >= 0x1000) if (offset >= 0x1000)
m_reg[offset & 7] = data; m_reg[offset & 7] = data & ((m_prg_chunks << 2) - 1);
} }
READ8_MEMBER(nes_2a03pur_device::read_h) READ8_MEMBER(nes_2a03pur_device::read_h)