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x68000: Better dot clock division (nw)

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This commit is contained in:
AJR 2018-06-25 21:35:21 -04:00
parent fefcae883f
commit 36d8aec535
1 changed files with 2 additions and 1 deletions
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3
src/mame/video/x68k.cpp
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@ -173,7 +173,7 @@ void x68k_state::x68k_crtc_refresh_mode()
// m_crtc.reg[4],m_crtc.reg[5],m_crtc.reg[6],m_crtc.reg[7],m_crtc.reg[8],m_crtc.reg[9]);
unsigned div = BIT(m_crtc.reg[20], 1) ? 1 : BIT(m_crtc.reg[20], 0) ? 2 : 4;
if ((m_crtc.reg[20] & 0x0c) == 0)
div *= 2;
div *= BIT(m_crtc.reg[20], 4) ? 3 : 2;
attotime refresh = attotime::from_ticks(scr.max_x * scr.max_y, (BIT(m_crtc.reg[20], 4) ? 69.55199_MHz_XTAL : 38.86363_MHz_XTAL) / div);
LOG("m_screen->configure(%i,%i,[%i,%i,%i,%i],%f)\n", scr.max_x, scr.max_y, visiblescr.min_x, visiblescr.min_y, visiblescr.max_x, visiblescr.max_y, ATTOSECONDS_TO_HZ(refresh.as_attoseconds()));
m_screen->configure(scr.max_x, scr.max_y, visiblescr, refresh.as_attoseconds());
@ -442,6 +442,7 @@ WRITE16_MEMBER(x68k_state::x68k_crtc_w )
if(data & 0x0400)
m_crtc.interlace = 1;
}*/
LOG("CRTC: Register 20 = %04x\n", m_crtc.reg[20]);
x68k_crtc_refresh_mode();
break;
case 576: // operation register