diff options
Diffstat (limited to 'src/mame/shared/pk8000_v.cpp')
-rw-r--r-- | src/mame/shared/pk8000_v.cpp | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/mame/shared/pk8000_v.cpp b/src/mame/shared/pk8000_v.cpp new file mode 100644 index 00000000000..3ba8f93ecff --- /dev/null +++ b/src/mame/shared/pk8000_v.cpp @@ -0,0 +1,180 @@ +// license:BSD-3-Clause +// copyright-holders:Miodrag Milanovic +#include "emu.h" +#include "pk8000_v.h" + +uint8_t pk8000_base_state::video_color_r() +{ + return m_video_color; +} + +void pk8000_base_state::video_color_w(uint8_t data) +{ + m_video_color = data; +} + +uint8_t pk8000_base_state::text_start_r() +{ + return m_text_start; +} + +void pk8000_base_state::text_start_w(uint8_t data) +{ + m_text_start = data; +} + +uint8_t pk8000_base_state::chargen_start_r() +{ + return m_chargen_start; +} + +void pk8000_base_state::chargen_start_w(uint8_t data) +{ + m_chargen_start = data; +} + +uint8_t pk8000_base_state::video_start_r() +{ + return m_video_start; +} + +void pk8000_base_state::video_start_w(uint8_t data) +{ + m_video_start = data; +} + +uint8_t pk8000_base_state::color_start_r() +{ + return m_color_start; +} + +void pk8000_base_state::color_start_w(uint8_t data) +{ + m_color_start = data; +} + +uint8_t pk8000_base_state::color_r(offs_t offset) +{ + return m_color[offset]; +} + +void pk8000_base_state::color_w(offs_t offset, uint8_t data) +{ + m_color[offset] = data; +} + +static constexpr rgb_t pk8000_pens[16] = { + { 0x00, 0x00, 0x00 }, // 0 + { 0x00, 0x00, 0x00 }, // 1 + { 0x00, 0xc0, 0x00 }, // 2 + { 0x00, 0xff, 0x00 }, // 3 + { 0x00, 0x00, 0xc0 }, // 4 + { 0x00, 0x00, 0xff }, // 5 + { 0x00, 0xc0, 0xc0 }, // 6 + { 0x00, 0xff, 0xff }, // 7 + { 0xc0, 0x00, 0x00 }, // 8 + { 0xff, 0x00, 0x00 }, // 9 + { 0xc0, 0xc0, 0x00 }, // A + { 0xff, 0xff, 0x00 }, // B + { 0xc0, 0x00, 0xc0 }, // C + { 0xff, 0x00, 0xff }, // D + { 0xc0, 0xc0, 0xc0 }, // E + { 0xff, 0xff, 0xff } // F +}; + +void pk8000_base_state::pk8000_palette(palette_device &palette) const +{ + palette.set_pen_colors(0, pk8000_pens); +} + +uint8_t pk8000_base_state::_84_porta_r() +{ + return m_video_mode; +} + +void pk8000_base_state::_84_porta_w(uint8_t data) +{ + m_video_mode = data; +} + +void pk8000_base_state::_84_portc_w(uint8_t data) +{ + m_video_enable = BIT(data, 4); +} + +uint32_t pk8000_base_state::video_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, uint8_t *videomem) +{ + uint16_t offset = (m_video_mode & 0xc0) << 8; + rectangle my_rect; + my_rect.set(0, 256+32-1, 0, 192+32-1); + + if (m_video_enable) { + bitmap.fill((m_video_color >> 4) & 0x0f, my_rect); + + if (BIT(m_video_mode,4)==0){ + // Text mode + if (BIT(m_video_mode,5)==0){ + // 32 columns + for (int y = 0; y < 24; y++) + { + for (int x = 0; x < 32; x++) + { + uint8_t chr = videomem[x +(y*32) + ((m_text_start & 0x0f) << 10)+offset] ; + uint8_t color= m_color[chr>>3]; + for (int j = 0; j < 8; j++) { + uint8_t code = videomem[((chr<<3) + j) + ((m_chargen_start & 0x0e) << 10)+offset]; + + for (int b = 0; b < 8; b++) + { + uint8_t col = (code >> b) & 0x01 ? (color & 0x0f) : ((color>>4) & 0x0f); + bitmap.pix((y*8)+j+16, x*8+(7-b)+16) = col; + } + } + } + } + } else { + // 40 columns + for (int y = 0; y < 24; y++) + { + for (int x = 0; x < 42; x++) + { + uint8_t chr = videomem[x +(y*64) + ((m_text_start & 0x0e) << 10)+offset] ; + for (int j = 0; j < 8; j++) { + uint8_t code = videomem[((chr<<3) + j) + ((m_chargen_start & 0x0e) << 10)+offset]; + for (int b = 2; b < 8; b++) + { + uint8_t col = ((code >> b) & 0x01) ? (m_video_color) & 0x0f : (m_video_color>>4) & 0x0f; + bitmap.pix((y*8)+j+16, x*6+(7-b)+16+8) = col; + } + } + } + } + } + } else { + //Graphics + for (int y = 0; y < 24; y++) + { + uint16_t off_color = (((~m_color_start) & 0x08) << 10)+offset + ((y>>3)<<11); + uint16_t off_code = (((~m_video_start) & 0x08) << 10)+offset + ((y>>3)<<11); + for (int x = 0; x < 32; x++) + { + uint8_t chr = videomem[x +(y*32) + ((m_chargen_start & 0x0e) << 10)+offset] ; + for (int j = 0; j < 8; j++) { + uint8_t color= videomem[((chr<<3) + j)+off_color]; + uint8_t code = videomem[((chr<<3) + j)+off_code]; + + for (int b = 0; b < 8; b++) + { + uint8_t col = (code >> b) & 0x01 ? (color & 0x0f) : ((color>>4) & 0x0f); + bitmap.pix((y*8)+j+16, x*8+(7-b)+16) = col; + } + } + } + } + } + } else { + // Disabled video + bitmap.fill(0, my_rect); + } + return 0; +} |