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amusco.cpp: Generate blink state in a way more likely to represent hardware; remove kludged-in MC6845 accessor (nw)

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This commit is contained in:
AJR 2017-03-18 23:22:37 -04:00
parent 5322568267
commit bb2e57ba2c
3 changed files with 10 additions and 10 deletions
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6
src/devices/video/mc6845.cpp
View File

@ -443,12 +443,6 @@ READ_LINE_MEMBER( mc6845_device::cursor_r )
}
READ_LINE_MEMBER( mc6845_device::cursor_state_r )
{
return m_cursor_state;
}
READ_LINE_MEMBER( mc6845_device::hsync_r )
{
return m_hsync;

1
src/devices/video/mc6845.h
View File

@ -140,7 +140,6 @@ public:
// read cursor line state
DECLARE_READ_LINE_MEMBER( cursor_r );
DECLARE_READ_LINE_MEMBER( cursor_state_r );
// read horizontal sync line state
DECLARE_READ_LINE_MEMBER( hsync_r );

13
src/mame/drivers/amusco.cpp
View File

@ -142,6 +142,7 @@ public:
required_device<ticket_dispenser_device> m_hopper;
uint8_t m_mc6845_address;
uint16_t m_video_update_address;
bool m_blink_state;
};
@ -160,8 +161,7 @@ TILE_GET_INFO_MEMBER(amusco_state::get_bg_tile_info)
int code = m_videoram[tile_index * 2] | (m_videoram[tile_index * 2 + 1] << 8);
int color = (code & 0x7000) >> 12;
// 6845 cursor is only used for its blink state
if (BIT(code, 15) && !m_crtc->cursor_state_r())
if (BIT(code, 15) && !m_blink_state)
code = 0;
SET_TILE_INFO_MEMBER(
@ -175,6 +175,7 @@ TILE_GET_INFO_MEMBER(amusco_state::get_bg_tile_info)
void amusco_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(amusco_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 10, 74, 24);
m_blink_state = false;
}
void amusco_state::machine_start()
@ -453,8 +454,14 @@ MC6845_ON_UPDATE_ADDR_CHANGED(amusco_state::crtc_addr)
MC6845_UPDATE_ROW(amusco_state::update_row)
{
// Latch blink state at start of first line, where cursor is always positioned
if (y == 0 && ma == 0 && m_blink_state != (cursor_x == 0))
{
m_blink_state = (cursor_x == 0);
m_bg_tilemap->mark_all_dirty();
}
const rectangle rowrect(0, 8 * x_count - 1, y, y);
m_bg_tilemap->mark_all_dirty();
m_bg_tilemap->draw(*m_screen, bitmap, rowrect, 0, 0);
}