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k053252.c: fix an off-by-one error, allowing various Konami games to actually match their Guru-measured vsyncs (nw)

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Alex W. Jackson 2014-06-02 21:14:25 +00:00
parent f40f0fc501
commit c0d1e01bbd
1 changed files with 9 additions and 6 deletions
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13
src/emu/machine/k053252.c
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@ -25,18 +25,18 @@ dbz2: 01 FF 00 21 00 37 00 00 01 20 0C 0E 54 00 00 00 384x256 ~ 384x256
xexex: 01 FF 00 21 00 37 01 00 00 20 0C 0E 54 00 00 00 384x256 ~ 384x256 (*)
(all konamigx, cowboys of moo mesa, run & gun, dj main)
(*) hblank duration 512 (0x200), hdisp 384 (0x180), vblank duration 288 (0x120), vdisp 256 (0x100)
(*) hcount total 512 (0x200), hdisp 384 (0x180), vcount total 289 (0x121), vdisp 256 (0x100)
Definitions from GX, look similar, all values big-endian, write-only:
0-1: bits 9-0: HC - Total hblank duration (-1) Hres ~ (HC+1) - HFP - HBP - 8*(HSW+1)
0-1: bits 9-0: HC - Total horizontal count (-1) Hres ~ (HC+1) - HFP - HBP - 8*(HSW+1)
2-3: bits 8-0: HFP - HBlank front porch
4-5: bits 8-0: HBP - HBlank back porch
6 : bits 7-0: INT1EN
7 : bits 7-0: INT2EN
8-9: bits 8-0: VC - Total vblank duration
a : bits 7-0: VFP - VBlank front porch Vres ~ VC - VFP - VBP - (VSW+1)
b : bits 7-0: VBP - VBlank back porch
8-9: bits 8-0: VC - Total vertical count (-1) Vres ~ (VC+1) - VFP - (VBP+1) - (VSW+1)
a : bits 7-0: VFP - VBlank front porch
b : bits 7-0: VBP - VBlank back porch (-1) (?)
c : bits 7-4: VSW - V-Sync Width
c : bits 3-0: HSW - H-Sync Width
d : bits 7-0: INT-TIME
@ -49,6 +49,7 @@ xexex: 01 FF 00 21 00 37 01 00 00 20 0C 0E 54 00 00 00 384x256 ~ 384x256 (*)
TODO:
- xexex sets up 0x20 as the VC? default value?
- xexex layers are offsetted if you try to use the CCU
- according to p.14-15 both HBP and VBP have +1 added, but to get correct visible areas you have to add it only to VBP
- understand how to interpret the back / front porch values, and remove the offset x/y hack
- dual screen support (for Konami GX types 3/4)
- viostorm and dbz reads the VCT port, but their usage is a side effect to send an irq ack thru the same port:
@ -195,6 +196,7 @@ WRITE8_MEMBER( k053252_device::write )
case 0x09:
m_vc = (m_regs[9]&0xff);
m_vc |= ((m_regs[8]&0x01)<<8);
m_vc++;
logerror("%d (%04x) VC set\n",m_vc,m_vc);
res_change();
break;
@ -205,6 +207,7 @@ WRITE8_MEMBER( k053252_device::write )
break;
case 0x0b:
m_vbp = (m_regs[0x0b]&0xff);
m_vbp++;
logerror("%d (%04x) VBP set\n",m_vbp,m_vbp);
res_change();
break;