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More friendly behavior when OPLL writes are performed out of range.

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This commit is contained in:
Aaron Giles 2021-04-02 15:04:39 -07:00
parent 52f0acb25c
commit ee1e4f9683
1 changed files with 7 additions and 1 deletions
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8
src/devices/sound/ymfm.cpp
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@ -1874,7 +1874,13 @@ void ymopll_registers::operator_map(operator_mapping &dest) const
bool ymopll_registers::write(u16 index, u8 data, u32 &channel, u32 &opmask) bool ymopll_registers::write(u16 index, u8 data, u32 &channel, u32 &opmask)
{ {
assert(index < REGISTERS); // unclear the address is masked down to 6 bits or if writes above
// the register top are ignored; assuming the latter for now
if (index >= REGISTERS)
{
LOG("ymopll write above register area; ignoring: %02X=%02X\n", index, data);
return false;
}
// write the new data // write the new data
m_regdata[index] = data; m_regdata[index] = data;