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scn2674: fixed row table addressing mode as per documentation

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This commit is contained in:
Miodrag Milanovic 2024-03-02 17:38:50 +01:00
parent 0c8a2c11da
commit 34287c3719
2 changed files with 6 additions and 1 deletions
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6
src/devices/video/scn2674.cpp
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@ -49,7 +49,7 @@ scn2674_device::scn2674_device(const machine_config &mconfig, device_type type,
, m_mbc_char_cb(*this, 0)
, m_mbc_attr_cb(*this, 0)
, m_IR_pointer(0)
, m_screen1_address(0), m_screen2_address(0)
, m_screen1_address(0), m_screen2_address(0), m_screen2_address_start(0)
, m_cursor_address(0)
, m_irq_register(0), m_status_register(0), m_irq_mask(0)
, m_gfx_enabled(false)
@ -121,6 +121,7 @@ void scn2674_device::device_start()
save_item(NAME(m_linecounter));
save_item(NAME(m_screen1_address));
save_item(NAME(m_screen2_address));
save_item(NAME(m_screen2_address_start));
save_item(NAME(m_cursor_address));
save_item(NAME(m_IR_pointer));
save_item(NAME(m_irq_register));
@ -174,6 +175,7 @@ void scn2674_device::device_reset()
{
m_screen1_address = 0;
m_screen2_address = 0;
m_screen2_address_start = 0;
m_cursor_address = 0;
m_irq_register = 0;
m_status_register = 0;
@ -975,6 +977,7 @@ void scn2674_device::write_screen2_address(bool msb, uint8_t data)
}
else
m_screen2_address = (m_screen2_address & 0x3f00) | data;
m_screen2_address_start = m_screen2_address;
}
void scn2672_device::write_screen2_address(bool msb, uint8_t data)
@ -1197,6 +1200,7 @@ TIMER_CALLBACK_MEMBER(scn2674_device::vblank_timer)
m_irq_register |= 0x10;
m_intr_cb(ASSERT_LINE);
}
m_screen2_address = m_screen2_address_start;
}
uint32_t scn2674_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)

1
src/devices/video/scn2674.h
View File

@ -62,6 +62,7 @@ protected:
uint8_t m_IR_pointer;
uint16_t m_screen1_address;
uint16_t m_screen2_address;
uint16_t m_screen2_address_start;
uint16_t m_cursor_address;
uint8_t m_irq_register;
uint8_t m_status_register;