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pc_vga.cpp: CRTC start address is supposed to be shifted left by 2, from 86Box [Melissa Goad]

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This commit is contained in:
Melissa Goad 2017-12-20 02:30:56 -06:00
parent cd514e5d9b
commit 818162a152
1 changed files with 2 additions and 1 deletions
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3
src/devices/video/pc_vga.cpp
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@ -221,7 +221,7 @@ void svga_device::zero()
/* VBLANK callback, start address definitely updates AT vblank, not before. */
TIMER_CALLBACK_MEMBER(vga_device::vblank_timer_cb)
{
vga.crtc.start_addr = vga.crtc.start_addr_latch;
vga.crtc.start_addr = vga.crtc.start_addr_latch << 2;
vga.attribute.pel_shift = vga.attribute.pel_shift_latch;
m_vblank_timer->adjust( machine().first_screen()->time_until_pos(vga.crtc.vert_blank_start + vga.crtc.vert_blank_end) );
}
@ -1489,6 +1489,7 @@ void vga_device::crtc_reg_write(uint8_t index, uint8_t data)
break;
case 0x0c:
case 0x0d:
//if(machine().first_screen()->vpos() < (vga.crtc.vert_retrace_start)) break;
vga.crtc.start_addr_latch &= ~(0xff << (((index & 1)^1) * 8));
vga.crtc.start_addr_latch |= (data << (((index & 1)^1) * 8));
break;