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kinst: correct pixel clock [Guru]

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This commit is contained in:
hap 2023-05-09 21:18:56 +02:00
parent 311289f457
commit ae872c2567
2 changed files with 4 additions and 10 deletions
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2
src/mame/handheld/hh_mn1400.cpp
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@ -417,7 +417,7 @@ ROM_END
/*******************************************************************************
Tomy Basketball
Tomy Basketball (model 7600)
* PCB label: TOMY, BASKET, 2E018E01
* MN9008 (28-pin MN1400, AI0-AI3 replaced with CO0-CO3, die label: 1400 BM-0)
* 2 7seg LEDs, 29 other LEDs, 1-bit sound

12
src/mame/rare/kinst.cpp
View File

@ -21,12 +21,6 @@ TODO:
- Bootup sequence (the blue color fill) is too fast, which in turn causes
attract mode music not to play. Maybe the main CPU is running at a lower
clockspeed at boot (50MHz/4 seems plausible), but then, what toggles it?
- Screen timing (not just H and V freq). 261 lines should be good, but pixel
clock is unknown. The only one that comes close to sensible values is 6MHz,
yet there is no (multiple of) 6MHz XTAL.
15384.6 / 58.9634 = 260.9178 (261 lines? howcome it's off by 0.1?)
15384.6 * 325 = 4999995 (nope, 5 clocks hblank/hsync is too short)
15384.6 * 390 = 5999994
****************************************************************************
@ -146,8 +140,8 @@ Notes:
It is used only with the KI2 conversion kit. This is mainly a protection device to stop game swaps on a KI 1 PCB. However if the
sub board is removed and all the EPROMs and HDD are changed, the main board will run Killer Instinct, providing U96 is the correct
chip for KI. If U96 is the type for KI2, then the main board will only run KI2 and can't be converted to KI.
HSync - 15.3846kHz
VSync - 58.9634Hz
HSync - 15.3846kHz (another measurement: 15.39090kHz)
VSync - 58.9634Hz (another measurement: 58.96258Hz)
ROMs
----
@ -703,7 +697,7 @@ void kinst_state::kinst(machine_config &config)
// video hardware
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_raw(6000000, 390, 0, 320, 261, 0, 240); // preliminary
screen.set_raw(50_MHz_XTAL/8, 406, 0, 320, 261, 0, 240);
screen.screen_vblank().set_inputline(m_maincpu, 0);
screen.set_screen_update(FUNC(kinst_state::screen_update));