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-rw-r--r--src/mess/video/avigo.c117
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;
+}
+