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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Clwyd Technics Colour Palette
Micro User Chameleon (DIY) - Micro User Jan/Feb 1990
TODO:
- the Chameleon should also implement a CB2 handler, as this is
pulsed whenever PB is written to. pb_w should only latch the
data, then a CB2 handler would update the palette.
**********************************************************************/
#include "emu.h"
#include "palext.h"
#include "emupal.h"
#include <algorithm>
namespace {
class bbc_palext_device : public device_t, public device_bbc_userport_interface
{
protected:
bbc_palext_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, type, tag, owner, clock)
, device_bbc_userport_interface(mconfig, *this)
, m_palette(*this, ":palette")
, m_colour(0)
{
}
// device_t overrides
virtual void device_start() override ATTR_COLD;
required_device<palette_device> m_palette;
uint8_t m_colour;
rgb_t m_palette_ram[16];
};
// ======================> bbc_chameleon_device
class bbc_chameleon_device : public bbc_palext_device
{
public:
bbc_chameleon_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: bbc_palext_device(mconfig, BBC_CHAMELEON, tag, owner, clock)
{
}
protected:
// optional information overrides
virtual const tiny_rom_entry* device_rom_region() const override;
virtual void pb_w(uint8_t data) override;
};
// ======================> bbc_cpalette_device
class bbc_cpalette_device : public bbc_palext_device
{
public:
static constexpr feature_type imperfect_features() { return feature::PALETTE; }
bbc_cpalette_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: bbc_palext_device(mconfig, BBC_CPALETTE, tag, owner, clock)
{
}
protected:
virtual void pb_w(uint8_t data) override;
};
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
ROM_START(chameleon)
ROM_REGION(0x2000, "exp_rom", 0)
ROM_LOAD("chameleon.rom", 0x0000, 0x2000, CRC(e0ea0252) SHA1(72cf334cdb866ba3dd2353fc7da0dfdb6abf63a7))
ROM_END
const tiny_rom_entry* bbc_chameleon_device::device_rom_region() const
{
return ROM_NAME(chameleon);
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void bbc_palext_device::device_start()
{
std::fill(std::begin(m_palette_ram), std::end(m_palette_ram), rgb_t(0));
// register for save states
save_item(NAME(m_colour));
save_item(NAME(m_palette_ram));
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
void bbc_chameleon_device::pb_w(uint8_t data)
{
data ^= 0x0f;
switch (data >> 6)
{
case 0x00:
m_palette_ram[m_colour].set_r(pal4bit(data));
break;
case 0x01:
m_palette_ram[m_colour].set_g(pal4bit(data));
break;
case 0x02:
m_palette_ram[m_colour].set_b(pal4bit(data));
break;
case 0x03:
m_colour = data & 0x0f;
m_palette->set_pen_colors(0, &m_palette_ram[BIT(data, 5) << 3], 8);
break;
}
}
void bbc_cpalette_device::pb_w(uint8_t data)
{
if (BIT(data, 3))
{
switch (data & 0x07)
{
case 0x00:
m_colour = ~(data >> 4) & 0x07;
break;
case 0x01:
m_palette_ram[m_colour].set_r(pal4bit(data));
break;
case 0x02:
m_palette_ram[m_colour].set_g(pal4bit(data));
break;
case 0x03:
m_palette_ram[m_colour].set_b(pal4bit(data));
break;
}
}
else
{
m_palette->set_pen_colors(0, &m_palette_ram[0], 8);
}
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(BBC_CHAMELEON, device_bbc_userport_interface, bbc_chameleon_device, "bbc_chameleon", "Micro User Chameleon (DIY)")
DEFINE_DEVICE_TYPE_PRIVATE(BBC_CPALETTE, device_bbc_userport_interface, bbc_cpalette_device, "bbc_cpalette", "Clwyd Technics Colour Palette")
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