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The proper fix, gleaned from DOSBox-X.

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This commit is contained in:
Melissa Goad 2017-12-20 20:43:41 -06:00
parent cb08f9da0e
commit 6c8aa3b163
1 changed files with 16 additions and 5 deletions
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21
src/devices/video/pc_vga.cpp
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@ -84,7 +84,7 @@ enum
#define EGA_LINE_LENGTH (vga.crtc.offset<<1)
#define VGA_COLUMNS (vga.crtc.horz_disp_end+1)
#define VGA_START_ADDRESS ((vga.crtc.start_addr<<2)&0xffff)
#define VGA_START_ADDRESS (vga.crtc.start_addr)
#define VGA_LINE_LENGTH (vga.crtc.offset<<3)
#define IBM8514_LINE_LENGTH (m_vga->offset())
@ -223,7 +223,7 @@ TIMER_CALLBACK_MEMBER(vga_device::vblank_timer_cb)
{
vga.crtc.start_addr = vga.crtc.start_addr_latch;
vga.attribute.pel_shift = vga.attribute.pel_shift_latch;
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start) );
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start + vga.crtc.vert_blank_end) );
}
TIMER_CALLBACK_MEMBER(s3_vga_device::vblank_timer_cb)
@ -234,7 +234,7 @@ TIMER_CALLBACK_MEMBER(s3_vga_device::vblank_timer_cb)
else
vga.crtc.start_addr = vga.crtc.start_addr_latch;
vga.attribute.pel_shift = vga.attribute.pel_shift_latch;
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start) );
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start + vga.crtc.vert_blank_end) );
}
void vga_device::device_start()
@ -439,6 +439,17 @@ uint16_t vga_device::offset()
return vga.crtc.offset << 2;
}
uint32_t vga_device::start_addr()
{
// popmessage("Offset: %04x %s %s **",vga.crtc.offset,vga.crtc.dw?"DW":"--",vga.crtc.word_mode?"BYTE":"WORD");
if(vga.crtc.dw)
return vga.crtc.start_addr << 2;
if(vga.crtc.word_mode)
return vga.crtc.start_addr << 0;
else
return vga.crtc.start_addr << 1;
}
void vga_device::vga_vh_text(bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
uint8_t ch, attr;
@ -579,7 +590,7 @@ void vga_device::vga_vh_vga(bitmap_rgb32 &bitmap, const rectangle &cliprect)
curr_addr = 0;
if(!(vga.sequencer.data[4] & 0x08))
{
for (addr = VGA_START_ADDRESS, line=0; line<LINES; line+=height, addr+=offset(), curr_addr+=offset())
for (addr = start_addr(), line=0; line<LINES; line+=height, addr+=offset(), curr_addr+=offset())
{
for(yi = 0;yi < height; yi++)
{
@ -1386,7 +1397,7 @@ void vga_device::recompute_params_clock(int divisor, int xtal)
refresh = HZ_TO_ATTOSECONDS(pixel_clock) * (hblank_period) * vblank_period;
machine().first_screen()->configure((hblank_period), (vblank_period), visarea, refresh );
//popmessage("%d %d\n",vga.crtc.horz_total * 8,vga.crtc.vert_total);
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start) );
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start + vga.crtc.vert_blank_end) );
}
void vga_device::recompute_params()