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a800: fixes writing antic DLISTL and DLISTH to only affect the high and low byte component that is spread between m_dpage and m_doffs (#8616)

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goldnchild 2021-09-24 13:49:36 -07:00 committed by GitHub
parent 9db8443a30
commit cdac9746b4
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 4 deletions
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8
src/mame/video/antic.cpp
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@ -1227,16 +1227,14 @@ void antic_device::write(offs_t offset, uint8_t data)
case 2:
LOG("ANTIC 02 write DLISTL $%02X\n", data);
m_w.dlistl = data;
temp = (m_w.dlisth << 8) + m_w.dlistl;
m_dpage = temp & DPAGE;
m_doffs = temp & DOFFS;
m_doffs = (m_doffs & 0x300) | (data & 0xff); // keep bits 9 and 8 of m_doffs
break;
case 3:
LOG("ANTIC 03 write DLISTH $%02X\n", data);
m_w.dlisth = data;
temp = (m_w.dlisth << 8) + m_w.dlistl;
m_dpage = temp & DPAGE;
m_doffs = temp & DOFFS;
m_doffs = (m_doffs & 0xff) | (temp & 0x300); // keep bits 7 to 0 of m_doffs
break;
case 4:
if( data == m_w.hscrol )
@ -1853,12 +1851,14 @@ void antic_device::linerefresh()
if( (m_cmd & 0x0f) == 2 || (m_cmd & 0x0f) == 3 )
{
artifacts_txt(src, (uint8_t*)(dst + 3), HCHARS);
draw_scanline8(*m_bitmap, 12, y, std::min(size_t(m_bitmap->width() - 12), sizeof(scanline)), (const uint8_t *) scanline, nullptr);
return;
}
else
if( (m_cmd & 0x0f) == 15 )
{
artifacts_gfx(src, (uint8_t*)(dst + 3), HCHARS);
draw_scanline8(*m_bitmap, 12, y, std::min(size_t(m_bitmap->width() - 12), sizeof(scanline)), (const uint8_t *) scanline, nullptr);
return;
}
}