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r31823 Friday 29th August, 2014 at 00:05:45 UTC by Angelo Salese
Note about 0xdde5, and made Seibu Cup Soccer to be 320x240 from this guess (makes sense considering that there's an ugly black border on bottom screen otherwise).

[src/mame/drivers]	legionna.c
[src/mame/machine]	seicop.c
[src/mame/video]	seibu_crtc.c

trunk/src/mame/machine/seicop.c

r31822	r31823
2787	2787	/* 8 + [4] */
2788	2788	/* 4 + [6] */
2789	2789
	2790	// these two are obvious ...
	2791	// 0xf x 16 = 240
	2792	// 0x14 x 16 = 320
	2793	// what are these two instead? scale factor? offsets?
	2794	// 0xfc69 ?
	2795	// 0x7f4 ?
2790	2796	//printf("%08x %08x %08x %08x %08x %08x %08x\n",m_cop_register[0],m_cop_register[1],m_cop_register[2],m_cop_register[3],m_cop_register[4],m_cop_register[5],m_cop_register[6]);
2791	2797
2792	2798	offs = (offset & 3) * 4;

trunk/src/mame/video/seibu_crtc.c

r31822	r31823
28	28	(screen 1 -> Foreground)
29	29	(screen 2 -> Midground)
30	30	(screen 3 -> Text layer)
31		[0x00]: Single cell H size +1?
32		[0x02]: Total number of visible cells +1?
	31	[0x00]: Total number of visible cells?
	32	[0x02]: Single cell H size +1?
33	33	[0x1a]: Layer Dynamic Paging?
34	34	[0x1c]: Layer Enable
35	35	---x ---- sprite enable

trunk/src/mame/drivers/legionna.c

r31822	r31823
1228	1228	MCFG_SCREEN_REFRESH_RATE(60)
1229	1229	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
1230	1230	MCFG_SCREEN_SIZE(42*8, 36*8)
1231		MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 32*8-1)
	1231	MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 30*8-1)
1232	1232	MCFG_SCREEN_UPDATE_DRIVER(legionna_state, screen_update_grainbow)
1233	1233	MCFG_SCREEN_PALETTE("palette")
1234	1234
r31822	r31823
1268	1268	MCFG_SCREEN_REFRESH_RATE(60)
1269	1269	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
1270	1270	MCFG_SCREEN_SIZE(42*8, 36*8)
1271		MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 32*8-1)
	1271	MCFG_SCREEN_VISIBLE_AREA(0*8, 40*8-1, 0*8, 30*8-1)
1272	1272	MCFG_SCREEN_UPDATE_DRIVER(legionna_state, screen_update_grainbow)
1273	1273	MCFG_SCREEN_PALETTE("palette")
1274	1274

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