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-rw-r--r--src/devices/video/upd7220.cpp9
-rw-r--r--src/mame/nec/pc9801.cpp2
2 files changed, 9 insertions, 2 deletions
diff --git a/src/devices/video/upd7220.cpp b/src/devices/video/upd7220.cpp
index 5398998b55c..06c04f232bb 100644
--- a/src/devices/video/upd7220.cpp
+++ b/src/devices/video/upd7220.cpp
@@ -346,7 +346,12 @@ inline void upd7220_device::dequeue(uint8_t *data, int *flag)
inline void upd7220_device::update_vsync_timer(int state)
{
- int next_y = state ? (m_vs + m_vbp) : 0;
+ const int vert_mult = (m_mode & UPD7220_MODE_INTERLACE_MASK) == UPD7220_MODE_INTERLACE_ON ? 2 : 1;
+
+ // page 6-68, route vsync so that top is start of back porch, end is at sync time
+ // (at bottom of MAME vpos() mechanism)
+ // - pc9801:lemmings and pc9801:spindiz2 cares
+ int next_y = state ? (m_vbp + m_al + m_vfp) * vert_mult : 0;
attotime duration = screen().time_until_pos(next_y, 0);
@@ -1888,7 +1893,7 @@ void upd7220_device::update_graphics(bitmap_rgb32 &bitmap, const rectangle &clip
int yval = (y*zoom)+z + (bsy + m_vbp);
// pc9801:duel sets up bitmap layer with height 384 vs. 400 of text layer
// so we scissor here, interlace wants it bumped x2 (microbx2)
- if(yval <= cliprect.bottom() && (yval - m_vbp) < m_al << interlace)
+ if(yval >= cliprect.top() && yval <= cliprect.bottom() && (yval - m_vbp) < m_al << interlace)
draw_graphics_line(bitmap, addr, yval, wd, pitch_shift);
}
}
diff --git a/src/mame/nec/pc9801.cpp b/src/mame/nec/pc9801.cpp
index 5105de995a7..0b0552a401b 100644
--- a/src/mame/nec/pc9801.cpp
+++ b/src/mame/nec/pc9801.cpp
@@ -847,6 +847,8 @@ void pc9801vm_state::pc9801rs_a0_w(offs_t offset, uint8_t data)
pal4bit(m_analog16.g[m_analog16.pal_entry]),
pal4bit(m_analog16.b[m_analog16.pal_entry])
);
+ // lemmings raster effects
+ m_screen->update_partial(m_screen->vpos());
return;
}