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timelimt: halve maincpu nmi rate, fixed spriteram out of bounds access

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This commit is contained in:
hap 2021-08-03 12:31:05 +02:00
parent e4963f1929
commit f6c71a1f8e
3 changed files with 21 additions and 11 deletions
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22
src/mame/drivers/timelimt.cpp
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@ -22,23 +22,25 @@ Notes:
#include "machine/gen_latch.h"
#include "machine/watchdog.h"
#include "sound/ay8910.h"
#include "screen.h"
#include "speaker.h"
/***************************************************************************/
void timelimt_state::machine_start()
{
m_nmi_state = false;
m_nmi_enabled = false;
save_item(NAME(m_nmi_state));
save_item(NAME(m_nmi_enabled));
}
WRITE_LINE_MEMBER(timelimt_state::nmi_enable_w)
{
m_nmi_enabled = state;
if (!m_nmi_enabled)
m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
m_nmi_enabled = bool(state);
}
WRITE_LINE_MEMBER(timelimt_state::coin_lockout_w)
@ -214,10 +216,14 @@ GFXDECODE_END
/***************************************************************************/
INTERRUPT_GEN_MEMBER(timelimt_state::irq)
INTERRUPT_GEN_MEMBER(timelimt_state::main_nmi)
{
if (m_nmi_enabled)
device.execute().set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
m_nmi_state = !m_nmi_state;
if (m_nmi_enabled && m_nmi_state)
m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
else if (!m_nmi_state)
m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
}
/***************************************************************************/
@ -228,7 +234,7 @@ void timelimt_state::timelimt(machine_config &config)
Z80(config, m_maincpu, 5000000); /* 5.000 MHz */
m_maincpu->set_addrmap(AS_PROGRAM, &timelimt_state::main_map);
m_maincpu->set_addrmap(AS_IO, &timelimt_state::main_io_map);
m_maincpu->set_vblank_int("screen", FUNC(timelimt_state::irq));
m_maincpu->set_vblank_int("screen", FUNC(timelimt_state::main_nmi));
Z80(config, m_audiocpu, 18432000/6); /* 3.072 MHz */
m_audiocpu->set_addrmap(AS_PROGRAM, &timelimt_state::sound_map);

5
src/mame/includes/timelimt.h
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@ -37,7 +37,8 @@ protected:
required_shared_ptr<uint8_t> m_bg_videoram;
required_shared_ptr<uint8_t> m_spriteram;
int m_nmi_enabled;
bool m_nmi_enabled;
bool m_nmi_state;
int m_scrollx;
int m_scrolly;
tilemap_t *m_bg_tilemap;
@ -60,7 +61,7 @@ protected:
uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
void draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect);
INTERRUPT_GEN_MEMBER(irq);
INTERRUPT_GEN_MEMBER(main_nmi);
void main_io_map(address_map &map);
void main_map(address_map &map);

5
src/mame/video/timelimt.cpp
View File

@ -87,6 +87,9 @@ void timelimt_state::video_start()
m_fg_tilemap->set_transparent_pen(0);
m_scrollx = 0;
m_scrolly = 0;
save_item(NAME(m_scrollx));
save_item(NAME(m_scrolly));
}
@ -125,7 +128,7 @@ void timelimt_state::scroll_y_w(uint8_t data)
void timelimt_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
for( int offs = m_spriteram.bytes(); offs >= 0; offs -= 4 )
for( int offs = m_spriteram.bytes() - 4; offs >= 0; offs -= 4 )
{
int sy = 240 - m_spriteram[offs];
int sx = m_spriteram[offs+3];