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destroyr: Use raw parameters for screen timing; correct IRQ timing

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This commit is contained in:
AJR 2020-08-11 16:00:18 -04:00
parent 5885169546
commit 7eecce8c3f
1 changed files with 16 additions and 11 deletions
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27
src/mame/drivers/destroyr.cpp
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@ -5,9 +5,6 @@
Atari Destroyer Driver
TODO:
- discrete sound
- accurate implementation of scanline counter as documented in schematics,
generate irqs from there, and refresh rate 15750/262 (~60.1) instead of 60
- missing language roms means DIP switches related to these do not function
***************************************************************************/
@ -15,6 +12,7 @@ TODO:
#include "emu.h"
#include "cpu/m6800/m6800.h"
#include "machine/74259.h"
#include "machine/timer.h"
#include "machine/watchdog.h"
#include "emupal.h"
#include "screen.h"
@ -77,6 +75,7 @@ private:
TIMER_CALLBACK_MEMBER(dial_callback);
TIMER_CALLBACK_MEMBER(frame_callback);
TIMER_DEVICE_CALLBACK_MEMBER(scanline_irq);
/* devices */
required_device<cpu_device> m_maincpu;
@ -228,6 +227,13 @@ TIMER_CALLBACK_MEMBER(destroyr_state::frame_callback)
}
TIMER_DEVICE_CALLBACK_MEMBER(destroyr_state::scanline_irq)
{
// 16V clocks LS74 flip-flop with D = 32V and /Q output connected to /IRQ on 6800
m_maincpu->set_input_line(M6800_IRQ_LINE, BIT(param, 5) ? ASSERT_LINE : CLEAR_LINE);
}
void destroyr_state::machine_reset()
{
m_frame_timer->adjust(m_screen->time_until_pos(0));
@ -267,7 +273,7 @@ void destroyr_state::cursor_load_w(uint8_t data)
void destroyr_state::interrupt_ack_w(uint8_t data)
{
m_maincpu->set_input_line(0, CLEAR_LINE);
m_maincpu->set_input_line(M6800_IRQ_LINE, CLEAR_LINE);
}
@ -483,9 +489,10 @@ void destroyr_state::machine_start()
void destroyr_state::destroyr(machine_config &config)
{
/* basic machine hardware */
M6800(config, m_maincpu, XTAL(12'096'000) / 16);
M6800(config, m_maincpu, 12.096_MHz_XTAL / 16);
m_maincpu->set_addrmap(AS_PROGRAM, &destroyr_state::main_map);
m_maincpu->set_periodic_int(FUNC(destroyr_state::irq0_line_assert), attotime::from_hz(4*60));
TIMER(config, "scantimer").configure_scanline(FUNC(destroyr_state::scanline_irq), m_screen, 16, 32);
f9334_device &outlatch(F9334(config, "outlatch")); // F8
outlatch.q_out_cb<0>().set_output("led0").invert(); // LED 1
@ -501,9 +508,7 @@ void destroyr_state::destroyr(machine_config &config)
/* video hardware */
SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
m_screen->set_refresh_hz(60);
m_screen->set_size(256, 262);
m_screen->set_visarea(0, 255, 0, 239);
m_screen->set_raw(12.096_MHz_XTAL / 2, 384, 0, 256, 263, 0, 240);
m_screen->set_screen_update(FUNC(destroyr_state::screen_update));
m_screen->set_palette(m_palette);
@ -550,7 +555,7 @@ ROM_START( destroyr )
ROM_REGION( 0x0020, "gfx4", 0 ) /* waves */
ROM_LOAD( "030136-01.k2", 0x0000, 0x0020, CRC(532c11b1) SHA1(18ab5369a3f2cfcc9a44f38fa8649524bea5b203) )
ROM_REGION( 0x0100, "user1", 0 ) /* sync (used for vsync/vblank signals, not hooked up yet) */
ROM_REGION( 0x0100, "syncprom", 0 ) /* used for vsync/vblank signals */
ROM_LOAD( "030131-01.m1", 0x0000, 0x0100, CRC(b8094b4c) SHA1(82dc6799a19984f3b204ee3aeeb007e55afc8be3) )
ROM_END
@ -576,7 +581,7 @@ ROM_START( destroyr1 )
ROM_REGION( 0x0020, "gfx4", 0 ) /* waves */
ROM_LOAD( "030136-01.k2", 0x0000, 0x0020, CRC(532c11b1) SHA1(18ab5369a3f2cfcc9a44f38fa8649524bea5b203) )
ROM_REGION( 0x0100, "user1", 0 ) /* sync (used for vsync/vblank signals, not hooked up yet) */
ROM_REGION( 0x0100, "syncprom", 0 ) /* used for vsync/vblank signals */
ROM_LOAD( "030131-01.m1", 0x0000, 0x0100, CRC(b8094b4c) SHA1(82dc6799a19984f3b204ee3aeeb007e55afc8be3) )
ROM_END