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// license:BSD-3-Clause
// copyright-holders:Zsolt Vasvari
/***************************************************************************
Epos games
***************************************************************************/
#include "emu.h"
#include "includes/epos.h"
/***************************************************************************
These games has one 32 byte palette PROM, connected to the RGB output this way:
bit 7 -- 240 ohm resistor -- RED
-- 510 ohm resistor -- RED
-- 1 kohm resistor -- RED
-- 240 ohm resistor -- GREEN
-- 510 ohm resistor -- GREEN
-- 1 kohm resistor -- GREEN
-- 240 ohm resistor -- BLUE
bit 0 -- 510 ohm resistor -- BLUE
***************************************************************************/
void epos_state::epos_palette(palette_device &palette) const
{
uint8_t const *const color_prom = memregion("proms")->base();
int const len = memregion("proms")->bytes();
for (offs_t i = 0; i < len; i++)
set_pal_color(palette, i, color_prom[i]);
}
void epos_state::set_pal_color(palette_device &palette, uint8_t offset, uint8_t data)
{
int bit0, bit1, bit2;
bit0 = BIT(data, 7);
bit1 = BIT(data, 6);
bit2 = BIT(data, 5);
int const r = 0x92 * bit0 + 0x4a * bit1 + 0x23 * bit2;
bit0 = BIT(data, 4);
bit1 = BIT(data, 3);
bit2 = BIT(data, 2);
int const g = 0x92 * bit0 + 0x4a * bit1 + 0x23 * bit2;
bit0 = BIT(data, 1);
bit1 = BIT(data, 0);
int const b = 0xad * bit0 + 0x52 * bit1;
palette.set_pen_color(offset, rgb_t(r, g, b));
}
// later (tristar 9000) games uses a dynamic palette instead of prom
WRITE8_MEMBER(epos_state::dealer_pal_w)
{
set_pal_color(*m_palette, offset, data);
}
WRITE8_MEMBER(epos_state::port_1_w)
{
/* D0 - start light #1
D1 - start light #2
D2 - coin counter
D3 - palette select
D4-D7 - unused
*/
m_leds[0] = BIT(data, 0);
m_leds[1] = BIT(data, 1);
machine().bookkeeping().coin_counter_w(0, (data >> 2) & 0x01);
m_palette_bank = (data >> 3) & 0x01;
}
uint32_t epos_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
for (offs_t offs = 0; offs < m_videoram.bytes(); offs++)
{
uint8_t const data = m_videoram[offs];
int x = (offs % 136) * 2;
int y = (offs / 136);
if (flip_screen())
{
bitmap.pix32(240 - y, 270 - x + 1) = m_palette->pen((m_palette_bank << 4) | (data & 0x0f));
bitmap.pix32(240 - y, 270 - x + 0) = m_palette->pen((m_palette_bank << 4) | (data >> 4));
}
else
{
bitmap.pix32(y, x + 0) = m_palette->pen((m_palette_bank << 4) | (data & 0x0f));
bitmap.pix32(y, x + 1) = m_palette->pen((m_palette_bank << 4) | (data >> 4));
}
}
return 0;
}
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