diff options
Diffstat (limited to 'src/mess/video/avigo.c')
-rw-r--r-- | src/mess/video/avigo.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/mess/video/avigo.c b/src/mess/video/avigo.c new file mode 100644 index 00000000000..b2dbb7c0016 --- /dev/null +++ b/src/mess/video/avigo.c @@ -0,0 +1,117 @@ +/*************************************************************************** + + avigo.c + + Functions to emulate the video hardware of the TI Avigo 10 PDA + +***************************************************************************/ + +#include "emu.h" +#include "includes/avigo.h" + +/*************************************************************************** + Start the video hardware emulation. +***************************************************************************/ + +/* mem size = 0x017c0 */ + + +/* current column to read/write */ + +#define AVIGO_VIDEO_DEBUG 0 +#define LOG(x) do { if (AVIGO_VIDEO_DEBUG) logerror x; } while (0) + + +READ8_MEMBER(avigo_state::vid_memory_r) +{ + if (!offset) + return m_screen_column; + + if ((offset<0x0100) || (offset>=0x01f0) || (m_screen_column >= (AVIGO_SCREEN_WIDTH>>3))) + { + LOG(("vid mem read: %04x\n", offset)); + return 0; + } + + /* 0x0100-0x01f0 contains data for selected column */ + return m_video_memory[m_screen_column + ((offset&0xff)*(AVIGO_SCREEN_WIDTH>>3))]; +} + +WRITE8_MEMBER(avigo_state::vid_memory_w) +{ + if (!offset) + { + /* select column to read/write */ + m_screen_column = data; + + LOG(("vid mem column write: %02x\n",data)); + + if (data>=(AVIGO_SCREEN_WIDTH>>3)) + { + LOG(("error: vid mem column write: %02x\n",data)); + } + return; + } + + if ((offset<0x0100) || (offset>=0x01f0) || (m_screen_column >= (AVIGO_SCREEN_WIDTH>>3))) + { + LOG(("vid mem write: %04x %02x\n", offset, data)); + return; + } + + /* 0x0100-0x01f0 contains data for selected column */ + m_video_memory[m_screen_column + ((offset&0xff)*(AVIGO_SCREEN_WIDTH>>3))] = data; +} + +void avigo_state::video_start() +{ + /* current selected column to read/write */ + m_screen_column = 0; + + /* allocate video memory */ + m_video_memory = machine().memory().region_alloc( "videoram", (AVIGO_SCREEN_WIDTH>>3) * AVIGO_SCREEN_HEIGHT + 1, 1, ENDIANNESS_LITTLE )->base(); + memset(m_video_memory, 0, (AVIGO_SCREEN_WIDTH>>3) * AVIGO_SCREEN_HEIGHT + 1); + + save_pointer(NAME(m_video_memory), (AVIGO_SCREEN_WIDTH>>3) * AVIGO_SCREEN_HEIGHT + 1); +} + +/* Initialise the palette */ +PALETTE_INIT( avigo ) +{ + palette_set_color(machine,0,MAKE_RGB(0xff,0xff,0xff)); /* white */ + palette_set_color(machine,1,MAKE_RGB(0x00,0x00,0x00)); /* black */ +} + +UINT32 avigo_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) +{ + int y; + int b; + int x; + + /* draw avigo display */ + for (y=0; y<AVIGO_SCREEN_HEIGHT; y++) + { + int by; + UINT8 *line_ptr = m_video_memory + (y*(AVIGO_SCREEN_WIDTH>>3)); + + x = 0; + for (by=((AVIGO_SCREEN_WIDTH>>3)-1); by>=0; by--) + { + int px; + UINT8 byte = line_ptr[0]; + + px = x; + for (b=7; b>=0; b--) + { + bitmap.pix16(y, px) = ((byte>>7) & 0x01); + px++; + byte = byte<<1; + } + + x = px; + line_ptr = line_ptr+1; + } + } + return 0; +} + |