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amstrad: improved Plus softscroll and split-screen

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This commit is contained in:
mahlemiut 2015-11-20 20:46:29 +13:00
parent d523085870
commit d542c2249f
1 changed files with 10 additions and 9 deletions
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19
src/mame/machine/amstrad.cpp
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@ -931,7 +931,7 @@ WRITE_LINE_MEMBER(amstrad_state::amstrad_plus_hsync_changed)
// CPC+/GX4000 Programmable Raster Interrupt (disabled if &6800 in ASIC RAM is 0)
if ( m_asic.pri != 0 )
{
if ( m_asic.pri == m_asic.vpos - 1 )
if ( m_asic.pri == m_asic.vpos )
{
logerror("PRI: triggered, scanline %d\n",m_asic.pri);
m_maincpu->set_input_line(0, ASSERT_LINE);
@ -1030,13 +1030,20 @@ WRITE_LINE_MEMBER(amstrad_state::amstrad_plus_de_changed)
/* DE became active, store the starting MA and RA signals */
m_gate_array.ma = m_crtc->get_ma();
m_gate_array.ra = m_crtc->get_ra();
m_asic.h_start = m_gate_array.line_ticks;
if(m_asic.de_start == 0)
m_asic.vpos = 1;
m_asic.vpos = 0;
m_asic.de_start = 1;
m_gate_array.colour = m_asic.ram[0x2420] + ( m_asic.ram[0x2421] << 8 );
m_asic.hscroll = m_asic.ram[0x2804] & 0x0f;
if ( m_asic.hscroll == 0 )
amstrad_plus_gate_array_get_video_data();
// if( m_asic.ram[0x2804] & 0x80 ) // draw border for first character if set (hides graphic mess when using softscroll)
// *m_gate_array.draw_p = m_asic.ram[0x2420] + ( m_asic.ram[0x2421] << 8 );
/* Start of screen */
if ( m_asic.vpos == 1 )
if ( m_asic.vpos == 0 )
{
m_asic.split_ma_base = 0x0000;
m_asic.split_ma_started = 0x0000;
@ -1047,12 +1054,6 @@ WRITE_LINE_MEMBER(amstrad_state::amstrad_plus_de_changed)
m_asic.split_ma_started = m_gate_array.ma;
m_asic.split_ma_base = ( m_asic.ram[0x2802] << 8 ) | m_asic.ram[0x2803];
}
m_gate_array.colour = m_asic.ram[0x2420] + ( m_asic.ram[0x2421] << 8 );
m_asic.hscroll = m_asic.ram[0x2804] & 0x0f;
if ( m_asic.hscroll == 0 )
amstrad_plus_gate_array_get_video_data();
}
if ( m_gate_array.de && ! state )