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cps3.cpp: tweak screen rates as per new measurements (nw)

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MetalliC 2019-09-08 23:34:11 +03:00
parent 9dfb61f4ef
commit a2f4131c89
1 changed files with 5 additions and 8 deletions
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13
src/mame/drivers/cps3.cpp
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@ -2493,18 +2493,15 @@ void cps3_state::cps3(machine_config &config)
/* video hardware */ /* video hardware */
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER)); screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_raw(XTAL(60'000'000)/8, 486, 0, 384, 259, 0, 224); screen.set_raw(XTAL(42'954'545)/5, (454+1)*6/5, 0, 384, 262+1, 0, 224); // H Total counter uses XTAL/6 clock
screen.set_screen_update(FUNC(cps3_state::screen_update)); screen.set_screen_update(FUNC(cps3_state::screen_update));
screen.screen_vblank().set(FUNC(cps3_state::vbl_interrupt)); screen.screen_vblank().set(FUNC(cps3_state::vbl_interrupt));
/* /*
Measured clocks: Measured clocks:
V = 59.5992Hz Video DAC = 8.602MHz (384 wide mode) ~ 42.9545MHz / 5
H = 15.4335kHz H = 15.73315kHz
H/V = 258.955 ~ 259 lines V = 59.8Hz
H/V ~ 263 lines
Possible video clocks:
60MHz / 15.4335kHz = 3887.647 / 8 = 485.956 ~ 486 -> likely
42.9545MHz / 15.4445kHz = 2781.217 / 6 = 463.536 -> unlikely
*/ */
TIMER(config, m_dma_timer).configure_generic(FUNC(cps3_state::dma_interrupt)); TIMER(config, m_dma_timer).configure_generic(FUNC(cps3_state::dma_interrupt));