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author | 2021-07-10 10:48:59 +0900 | |
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committer | 2021-07-10 10:48:59 +0900 | |
commit | 730a86b8b4aa9d24d06bbd4b08510350dbe925e9 (patch) | |
tree | 4c95d518220e80e1783433e26463e218989a222b | |
parent | 24802a701d935248d8d057b679643efef0dfc503 (diff) |
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
-rw-r--r-- | src/mame/machine/megacd.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/mame/machine/megacd.cpp b/src/mame/machine/megacd.cpp index 669326e95a3..a1b74c69cd7 100644 --- a/src/mame/machine/megacd.cpp +++ b/src/mame/machine/megacd.cpp @@ -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? |