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/***************************************************************************
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
***************************************************************************/
static void get_pens( running_machine &machine, pen_t *pens )
{
offs_t i;
const UINT8 *prom = machine.region("proms")->base();
int len = machine.region("proms")->bytes();
for (i = 0; i < len; i++)
{
int bit0, bit1, bit2, r, g, b;
UINT8 data = prom[i];
bit0 = (data >> 7) & 0x01;
bit1 = (data >> 6) & 0x01;
bit2 = (data >> 5) & 0x01;
r = 0x92 * bit0 + 0x4a * bit1 + 0x23 * bit2;
bit0 = (data >> 4) & 0x01;
bit1 = (data >> 3) & 0x01;
bit2 = (data >> 2) & 0x01;
g = 0x92 * bit0 + 0x4a * bit1 + 0x23 * bit2;
bit0 = (data >> 1) & 0x01;
bit1 = (data >> 0) & 0x01;
b = 0xad * bit0 + 0x52 * bit1;
pens[i] = MAKE_RGB(r, g, b);
}
}
WRITE8_HANDLER( epos_port_1_w )
{
epos_state *state = space->machine().driver_data<epos_state>();
/* D0 - start light #1
D1 - start light #2
D2 - coin counter
D3 - palette select
D4-D7 - unused
*/
set_led_status(space->machine(), 0, (data >> 0) & 0x01);
set_led_status(space->machine(), 1, (data >> 1) & 0x01);
coin_counter_w(space->machine(), 0, (data >> 2) & 0x01);
state->m_palette = (data >> 3) & 0x01;
}
SCREEN_UPDATE( epos )
{
epos_state *state = screen->machine().driver_data<epos_state>();
pen_t pens[0x20];
offs_t offs;
get_pens(screen->machine(), pens);
for (offs = 0; offs < state->m_videoram_size; offs++)
{
UINT8 data = state->m_videoram[offs];
int x = (offs % 136) * 2;
int y = (offs / 136);
*BITMAP_ADDR32(bitmap, y, x + 0) = pens[(state->m_palette << 4) | (data & 0x0f)];
*BITMAP_ADDR32(bitmap, y, x + 1) = pens[(state->m_palette << 4) | (data >> 4)];
}
return 0;
}
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