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clshroad.cpp: init bg vram to 0xf0 and assume common divider for all z80s (nw)

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This commit is contained in:
angelosa 2017-04-25 21:33:53 +02:00
parent 9d5d0a2205
commit e13d5a9b57
1 changed files with 19 additions and 11 deletions
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30
src/mame/drivers/clshroad.cpp
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@ -16,10 +16,13 @@ Sound Chips : Custom (NAMCO)
XTAL : 18.432 MHz
Notes:
- firebatl video (https://tmblr.co/ZgJvzv2E2C_z-) shows transparency for the
text layer is not correctly emulated.
TODO:
- few unused video registers (2 and 3);
- clshroad: erratic gameplay speed;
- firebatl: video (https://tmblr.co/ZgJvzv2E2C_z-) shows transparency for the
text layer is not correctly emulated, fixed by initializing VRAM to 0xf0? (that layer seems unused by this game);
- firebatl: bad sprite colors;
- firebatl: remove ROM patch;
***************************************************************************/
@ -31,11 +34,16 @@ Notes:
#include "screen.h"
#include "speaker.h"
/* unknown divider, assume /5 */
#define MAIN_CLOCK XTAL_18_432MHz/5
void clshroad_state::machine_reset()
{
flip_screen_set(0);
m_main_irq_mask = m_sound_irq_mask = 0;
// not initialized by HW, matches grey background on first title screen
for(int i = 0;i<0x800;i++)
m_vram_0[i] = 0xf0;
}
@ -271,11 +279,11 @@ INTERRUPT_GEN_MEMBER(clshroad_state::sound_timer_irq)
static MACHINE_CONFIG_START( firebatl, clshroad_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", Z80, 3000000) /* ? */
MCFG_CPU_ADD("maincpu", Z80, MAIN_CLOCK) /* ? */
MCFG_CPU_PROGRAM_MAP(clshroad_map)
MCFG_CPU_VBLANK_INT_DRIVER("screen", clshroad_state, vblank_irq)
MCFG_CPU_ADD("audiocpu", Z80, 3000000) /* ? */
MCFG_CPU_ADD("audiocpu", Z80, MAIN_CLOCK) /* ? */
MCFG_CPU_PROGRAM_MAP(clshroad_sound_map)
MCFG_CPU_PERIODIC_INT_DRIVER(clshroad_state, sound_timer_irq, 120) /* periodic interrupt, don't know about the frequency */
@ -305,14 +313,14 @@ MACHINE_CONFIG_END
static MACHINE_CONFIG_START( clshroad, clshroad_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", Z80, XTAL_18_432MHz/4) /* ? real speed unknown. 3MHz is too low and causes problems */
MCFG_CPU_ADD("maincpu", Z80, MAIN_CLOCK) /* ? real speed unknown. 3MHz is too low and causes problems */
MCFG_CPU_PROGRAM_MAP(clshroad_map)
MCFG_CPU_VBLANK_INT_DRIVER("screen", clshroad_state, irq0_line_hold) /* IRQ, no NMI */
MCFG_CPU_VBLANK_INT_DRIVER("screen", clshroad_state, vblank_irq)
MCFG_CPU_ADD("audiocpu", Z80, XTAL_18_432MHz/6) /* ? */
MCFG_CPU_ADD("audiocpu", Z80, MAIN_CLOCK) /* ? */
MCFG_CPU_PROGRAM_MAP(clshroad_sound_map)
MCFG_CPU_VBLANK_INT_DRIVER("screen", clshroad_state, irq0_line_hold) /* IRQ, no NMI */
//MCFG_CPU_VBLANK_INT_DRIVER("screen", clshroad_state, irq0_line_hold) /* IRQ, no NMI */
MCFG_CPU_PERIODIC_INT_DRIVER(clshroad_state, sound_timer_irq, 60) /* periodic interrupt, don't know about the frequency */
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)