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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
RCA CDP1861 Video Display Controller emulation
**********************************************************************
_____ _____
_CLK 1 |* \_/ | 24 Vdd
_DMAO 2 | | 23 _CLEAR
_INT 3 | | 22 SC1
TPA 4 | | 21 SC0
TPB 5 | | 20 DI7
_COMP SYNC 6 | CDP1861 | 19 DI6
VIDEO 7 | | 18 DI5
_RESET 8 | | 17 DI4
_EFX 9 | | 16 DI3
DISP ON 10 | | 15 DI2
DISP OFF 11 | | 14 DI1
Vss 12 |_____________| 13 DI0
**********************************************************************/
#ifndef MAME_VIDEO_CDP1861_H
#define MAME_VIDEO_CDP1861_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> cdp1861_device
class cdp1861_device : public device_t,
public device_video_interface
{
public:
static constexpr unsigned VISIBLE_COLUMNS = 64;
static constexpr unsigned VISIBLE_LINES = 128;
static constexpr unsigned HBLANK_START = 14 * 8;
static constexpr unsigned HBLANK_END = 12;
static constexpr unsigned HSYNC_START = 0;
static constexpr unsigned HSYNC_END = 12;
static constexpr unsigned SCREEN_WIDTH = 14 * 8;
static constexpr unsigned TOTAL_SCANLINES = 262;
static constexpr unsigned SCANLINE_DISPLAY_START = 80;
static constexpr unsigned SCANLINE_DISPLAY_END = 208;
static constexpr unsigned SCANLINE_VBLANK_START = 262;
static constexpr unsigned SCANLINE_VBLANK_END = 16;
static constexpr unsigned SCANLINE_VSYNC_START = 16;
static constexpr unsigned SCANLINE_VSYNC_END = 0;
static constexpr unsigned SCANLINE_INT_START = SCANLINE_DISPLAY_START - 2;
static constexpr unsigned SCANLINE_INT_END = SCANLINE_DISPLAY_START;
static constexpr unsigned SCANLINE_EFX_TOP_START = SCANLINE_DISPLAY_START - 4;
static constexpr unsigned SCANLINE_EFX_TOP_END = SCANLINE_DISPLAY_START;
static constexpr unsigned SCANLINE_EFX_BOTTOM_START = SCANLINE_DISPLAY_END - 4;
static constexpr unsigned SCANLINE_EFX_BOTTOM_END = SCANLINE_DISPLAY_END;
// construction/destruction
cdp1861_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
auto int_cb() { return m_write_int.bind(); }
auto dma_out_cb() { return m_write_dma_out.bind(); }
auto efx_cb() { return m_write_efx.bind(); }
void dma_w(uint8_t data);
void disp_on_w(int state);
void disp_off_w(int state);
uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
bitmap_rgb32 m_bitmap;
protected:
// device-level overrides
virtual void device_config_complete() override;
virtual void device_start() override;
virtual void device_reset() override;
TIMER_CALLBACK_MEMBER(int_tick);
TIMER_CALLBACK_MEMBER(efx_tick);
TIMER_CALLBACK_MEMBER(dma_tick);
private:
devcb_write_line m_write_int;
devcb_write_line m_write_dma_out;
devcb_write_line m_write_efx;
int m_disp; // display enabled
int m_dispon; // display on latch
int m_dispoff; // display off latch
int m_dmaout; // DMA request active
// timers
emu_timer *m_int_timer; // interrupt timer
emu_timer *m_efx_timer; // EFx timer
emu_timer *m_dma_timer; // DMA timer
};
// device type definition
DECLARE_DEVICE_TYPE(CDP1861, cdp1861_device)
#endif // MAME_VIDEO_CDP1861_H
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