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Read/write handlers for PRGRAM access from Main side was using u16 for the calculated offset, causing an overflow and constantly pointing to bank 0. Changed to u32, observed expected results

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Damian R 2021-07-10 10:48:59 +09:00
parent 24802a701d
commit 730a86b8b4
1 changed files with 2 additions and 2 deletions
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4
src/mame/machine/megacd.cpp
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@ -750,14 +750,14 @@ void sega_segacd_device::segacd_comms_flags_maincpu_w(offs_t offset, uint16_t da
uint16_t sega_segacd_device::scd_4m_prgbank_ram_r(offs_t offset)
{
uint16_t realoffset = ((segacd_4meg_prgbank * 0x20000)/2) + offset;
uint32_t realoffset = ((segacd_4meg_prgbank * 0x20000)/2) + offset;
return m_prgram[realoffset];
}
void sega_segacd_device::scd_4m_prgbank_ram_w(offs_t offset, uint16_t data, uint16_t mem_mask)
{
uint16_t realoffset = ((segacd_4meg_prgbank * 0x20000)/2) + offset;
uint32_t realoffset = ((segacd_4meg_prgbank * 0x20000)/2) + offset;
// todo:
// check for write protection? (or does that only apply to writes on the SubCPU side?