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vt1682.cpp - (plug & play) mostly fixed raster effects (#5937)

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* some kind of rasters (nw)

* fix raster timer, clean up (nw)

* srcclean (nw)
This commit is contained in:
David Haywood 2019-11-21 13:55:34 +00:00 committed by R. Belmont
parent bf22b6ba95
commit cabb52c75b
4 changed files with 93 additions and 53 deletions
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56
src/mame/drivers/vt1682.cpp
View File

@ -31,6 +31,23 @@
#define VERBOSE (0)
#include "logmacro.h"
// NTSC uses XTAL(21'477'272) Sound CPU runs at exactly this, Main CPU runs at this / 4
// PAL uses XTAL(26'601'712) Sound CPU runs at exactly this, Main CPU runs at this / 5
// can also be used with the following
// PAL M 21.453669MHz
// PAL N 21.492336MHz
#define MAIN_CPU_CLOCK_NTSC XTAL(21'477'272)/4
#define SOUND_CPU_CLOCK_NTSC XTAL(21'477'272)
#define TIMER_ALT_SPEED_NTSC (15746)
#define MAIN_CPU_CLOCK_PAL XTAL(26'601'712)/5
#define SOUND_CPU_CLOCK_PAL XTAL(26'601'712)
#define TIMER_ALT_SPEED_PAL (15602)
class vt_vt1682_state : public driver_device
{
public:
@ -488,6 +505,13 @@ private:
m_system_timer_dev->vt1682_timer_enable_w(space, offset, data);
};
DECLARE_WRITE8_MEMBER(vt1682_timer_preload_15_8_trampoline_w)
{
logerror("%s: vt1682_timer_preload_15_8_trampoline_w: %02x @ position y%d, x%d\n", machine().describe_context(), data, m_screen->vpos(), m_screen->hpos());
m_system_timer_dev->vt1682_timer_preload_15_8_w(space, offset, data);
};
void update_banks();
uint8_t translate_prg0select(uint8_t tp20_tp13);
uint32_t translate_address_4000_to_7fff(uint16_t address);
@ -2600,7 +2624,7 @@ WRITE8_MEMBER(vt_vt1682_state::vt1682_210a_prgbank0_r3_w)
/*
Address 0x210b r/w (MAIN CPU)
0x80 - TSYSN Enable
0x80 - TSYSN En (Timer Clock Select)
0x40 - PQ2 Enable
0x20 - BUS Tristate
0x10 - CS Control:1
@ -2623,6 +2647,17 @@ WRITE8_MEMBER(vt_vt1682_state::vt1682_210b_misc_cs_prg0_bank_sel_w)
logerror("%s: vt1682_210b_misc_cs_prg0_bank_sel_w writing: %02x\n", machine().describe_context(), data);
m_210b_misc_cs_prg0_bank_sel = data;
// TODO: allow PAL
if (data & 0x80)
{
m_system_timer_dev->set_clock(TIMER_ALT_SPEED_NTSC);
}
else
{
m_system_timer_dev->set_clock(MAIN_CPU_CLOCK_NTSC);
}
update_banks();
}
@ -4881,11 +4916,12 @@ void vt_vt1682_state::vt_vt1682_map(address_map &map)
/* System */
map(0x2100, 0x2100).rw(FUNC(vt_vt1682_state::vt1682_2100_prgbank1_r3_r), FUNC(vt_vt1682_state::vt1682_2100_prgbank1_r3_w));
map(0x2101, 0x2101).rw(m_system_timer_dev, FUNC(vrt_vt1682_timer_device::vt1682_timer_preload_15_8_r), FUNC(vrt_vt1682_timer_device::vt1682_timer_preload_15_8_w));
map(0x2101, 0x2101).rw(m_system_timer_dev, FUNC(vrt_vt1682_timer_device::vt1682_timer_preload_7_0_r), FUNC(vrt_vt1682_timer_device::vt1682_timer_preload_7_0_w));
map(0x2102, 0x2102).r(m_system_timer_dev, FUNC(vrt_vt1682_timer_device::vt1682_timer_enable_r));
map(0x2102, 0x2102).w(FUNC(vt_vt1682_state::vt1682_timer_enable_trampoline_w));
map(0x2103, 0x2103).w( m_system_timer_dev, FUNC(vrt_vt1682_timer_device::vt1682_timer_irqclear_w));
map(0x2104, 0x2104).rw(m_system_timer_dev, FUNC(vrt_vt1682_timer_device::vt1682_timer_preload_7_0_r), FUNC(vrt_vt1682_timer_device::vt1682_timer_preload_7_0_w)); // not on 2100 as you might expect
map(0x2104, 0x2104).r(m_system_timer_dev, FUNC(vrt_vt1682_timer_device::vt1682_timer_preload_15_8_r));
map(0x2104, 0x2104).w(FUNC(vt_vt1682_state::vt1682_timer_preload_15_8_trampoline_w));
map(0x2105, 0x2105).w(FUNC(vt_vt1682_state::vt1682_2105_comr6_tvmodes_w));
map(0x2106, 0x2106).rw(FUNC(vt_vt1682_state::vt1682_2106_enable_regs_r), FUNC(vt_vt1682_state::vt1682_2106_enable_regs_w));
map(0x2107, 0x2107).rw(FUNC(vt_vt1682_state::vt1682_2107_prgbank0_r0_r), FUNC(vt_vt1682_state::vt1682_2107_prgbank0_r0_w));
@ -5103,18 +5139,6 @@ static GFXDECODE_START( gfx_test )
GFXDECODE_END
// NTSC uses XTAL(21'477'272) Sound CPU runs at exactly this, Main CPU runs at this / 4
// PAL uses XTAL(26'601'712) Sound CPU runs at exactly this, Main CPU runs at this / 5
// can also be used with the following
// PAL M 21.453669MHz
// PAL N 21.492336MHz
#define MAIN_CPU_CLOCK_NTSC XTAL(21'477'272)/4
#define SOUND_CPU_CLOCK_NTSC XTAL(21'477'272)
#define MAIN_CPU_CLOCK_PAL XTAL(26'601'712)/5
#define SOUND_CPU_CLOCK_PAL XTAL(26'601'712)
void vt_vt1682_state::vt_vt1682(machine_config &config)
@ -5158,7 +5182,7 @@ void vt_vt1682_state::vt_vt1682(machine_config &config)
SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
m_screen->set_refresh_hz(60);
m_screen->set_vblank_time(ATTOSECONDS_IN_USEC(0));
m_screen->set_size(256, 256);
m_screen->set_size(256, 262); // 262 for NTSC, might be 261 if Vblank line is changed
m_screen->set_visarea(0, 256-1, 0, 240-1);
m_screen->set_screen_update(FUNC(vt_vt1682_state::screen_update));

34
src/mame/machine/vt1682_timer.cpp
View File

@ -1,6 +1,9 @@
// license:BSD-3-Clause
// copyright-holders:David Haywood
// Do timers auto reload?
// Does writing to Enable actually turn on the timer, or writing to preload MSB? (which appears to be done AFTER turning on in many cases)
#include "emu.h"
#include "machine/vt1682_timer.h"
@ -94,13 +97,28 @@ READ8_MEMBER(vrt_vt1682_timer_device::vt1682_timer_preload_15_8_r)
return ret;
}
void vrt_vt1682_timer_device::update_timer()
{
if (m_timer_enable & 0x01)
{
uint16_t preload = (m_timer_preload_15_8 << 8) | m_timer_preload_7_0;
int realpreload = 65536 - preload;
m_timer->adjust(attotime::from_hz(clock()) * realpreload, 0, attotime::from_hz(clock()) * realpreload);
}
}
WRITE8_MEMBER(vrt_vt1682_timer_device::vt1682_timer_preload_15_8_w)
{
if (!m_is_sound_timer) LOGMASKED(LOG_TIMER,"%s: vt1682_timer_preload_15_8_w writing: %02x\n", machine().describe_context(), data);
m_timer_preload_15_8 = data;
update_timer();
}
/*
Address 0x2102 r/w (SOUND CPU, Timer A)
Address 0x2112 r/w (SOUND CPU, Timer B)
@ -135,26 +153,17 @@ WRITE8_MEMBER(vrt_vt1682_timer_device::vt1682_timer_enable_w)
// Period = (65536 - Timer PreLoad) / 26.601712 MHz
//Timer PreLoad = 65536 - (Period in seconds) * 26.601712 * 1000000 )
/*
*/
if (!m_is_sound_timer) LOGMASKED(LOG_TIMER, "%s: vt1682_timer_enable_w writing: %02x\n", machine().describe_context(), data);
m_timer_enable = data;
if (m_timer_enable & 0x01)
{
uint16_t preload = (m_timer_preload_15_8 << 8) | m_timer_preload_7_0;
double period = (double)(65536 - preload) / (clock() / 1000000); // in microseconds?
if (!m_is_sound_timer) LOGMASKED(LOG_TIMER, "preload %d period in usec %f\n", preload, period );
m_timer->adjust(attotime::from_usec(period), 0, attotime::from_usec(period));
update_timer();
}
else
{
m_timer->adjust(attotime::never);
}
}
TIMER_DEVICE_CALLBACK_MEMBER(vrt_vt1682_timer_device::timer_expired)
@ -192,3 +201,8 @@ void vrt_vt1682_timer_device::device_add_mconfig(machine_config& config)
{
TIMER(config, m_timer).configure_periodic(FUNC(vrt_vt1682_timer_device::timer_expired), attotime::never);
}
void vrt_vt1682_timer_device::change_clock()
{
notify_clock_changed();
}

2
src/mame/machine/vt1682_timer.h
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@ -32,6 +32,7 @@ public:
DECLARE_WRITE8_MEMBER(vt1682_timer_irqclear_w);
void change_clock();
protected:
virtual void device_start() override;
@ -42,6 +43,7 @@ private:
bool m_is_sound_timer;
required_device<timer_device> m_timer;
void update_timer(void);
uint8_t m_timer_preload_7_0;
uint8_t m_timer_preload_15_8;