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v100: Improve calculation of character row length, which now also works for 132-column mode (nw)

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This commit is contained in:
AJR 2018-04-27 15:22:44 -04:00
parent 1f12966f99
commit 8e043cd918
1 changed files with 2 additions and 15 deletions
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17
src/mame/drivers/v100.cpp
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@ -85,27 +85,14 @@ u32 v100_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const
unsigned row0 = cliprect.top() / 10; unsigned row0 = cliprect.top() / 10;
unsigned x0 = cliprect.left(); unsigned x0 = cliprect.left();
unsigned px0 = x0 % CHAR_WIDTH; unsigned px0 = x0 % CHAR_WIDTH;
unsigned columns = screen.visible_area().width() / CHAR_WIDTH;
u16 start = 0; u16 start = 0;
unsigned y = 0; unsigned y = 0;
for (unsigned row = 0; y <= cliprect.bottom(); row++) for (unsigned row = 0; y <= cliprect.bottom(); row++)
{ {
start = m_videoram[start] | (m_videoram[(start + 1) & 0xfff] << 8); start = m_videoram[start] | (m_videoram[(start + 1) & 0xfff] << 8);
u16 end = start + 0x50; u16 end = start + ((start & 0x3000) != 0 ? (columns / 2) + 1 : columns);
switch (start & 0xf000)
{
case 0x1000:
end = start + 0x29;
break;
case 0x3000:
end = start + 0x6e;
break;
case 0xc000:
end = start + 0x50;
break;
default:
break;
}
start &= 0xfff; start &= 0xfff;
end &= 0xfff; end &= 0xfff;